fix(ui): reconcile PR 66 with current main

Make the Android store look and read like the rest of the app

README.md

@@ -73,7 +73,7 @@ Drag files onto the window to send them. Drop a game's .zip, folder or .exe to a
 Browse the shots you take in the headset and save them to your Pictures folder.
 
 **⌨️ Keyboard and trackpad**<br>
-Type and point in the Frame's apps from your computer or phone, through KDE Connect, which Frame Control brings along and sets up on the Frame. Nothing else to install, anywhere.
+Type and point in the headset from your computer or phone, through Valve's own input path, with nothing to install. Accents and emoji use KDE Connect, which Frame Control brings along and sets up the first time you type one.
 
 </td>
 </tr>
@@ -219,7 +219,7 @@ Frame's software fits together, all checked against a real headset and labelled
 | [Install links for websites](docs/web-install.md) | `frame-control://install` links and manifests, the rules, a button to paste |
 | [VR comfort and HUD](docs/vr-utilities.md) · [Steam games](docs/steam-games.md) · [VR video](docs/vr-video.md) · [WebXR in Chromium](docs/webxr-chromium.md) | Installing and buying, watching VR180/360, the Chromium build |
 | [Mac in the headset](docs/mac-in-headset.md) | Mac windows and screens as panels in the Frame, with laser and keyboard input |
-| [VR mods and custom songs](docs/mods.md) | Per-game feasibility, real-Frame results and blockers; no installer yet |
+| [VR mods and custom songs](docs/mods.md) | UEVR for Unreal games from Frame Control (install, play in VR, remove), the per-game table, Beat Saber blockers |
 | [SSH](docs/ssh.md) · [Streaming](docs/streaming.md) · [Files](docs/file-transfer.md) · [Panels](docs/panels.md) · [Tailscale](docs/tailscale.md) | Topic notes |
 | [Frame Control for iPhone](docs/iphone.md) | The iPhone and iPad app, how it runs the server on the Frame, pairing |
 | [Recovery and OS images](docs/recovery-and-images.md) | Where to download the Frame's OS, what's inside, testing without the headset |

docs/evidence/mods-2026-09-29.md

@@ -0,0 +1,122 @@
+# UEVR from Frame Control, 2026-09-29
+
+**Verified observations**, with limits below. Same device and software as
+[2026-09-28](mods-2026-09-28.md): aarch64, SteamOS `0.4.1`, BUILD_ID
+`20260925.6191901`, Proton `11.0-2c` ARM64, SteamVR `2.18.1`. Times are the
+Frame's AEST clock. Headset tests ran under the shared
+`/tmp/frame-test.lock`, taken 11:13–11:28, 11:33–11:49, 12:02–12:40,
+12:44–12:52 and 13:01–13:03. Battery 45 % →
+93 %, on charge throughout.
+
+**Not observed:** the VR image, head tracking and controller input. SteamVR
+reported `activity_level` 3 (user interaction timeout; the headset was not
+being worn) with `average_target_fps` 1. Every `frame_vrshot.py` stereo
+capture was a uniform dark frame. Frame submits prove the app is presenting
+to SteamVR, not that the image is correct.
+
+## Manual injection (11:13–11:28)
+
+Game launched with `steam steam://rungameid/1067310`. `UEVRInjector.exe` was
+started with the game process's Wine variables, and its WPF window drew
+through DXVK's D3D9. It listed `Drop-Win64-Shipping (pid: 320) (SkyArk
+(64-bit, PCD3D_SM5))`, a Wine-side process id.
+
+- `--attach=Drop-Win64-Shipping` didn't inject. The button still read
+  **Inject**, and the saved `OpenVRRadio=True` in `AppData/Local/praydog/…/user.config`
+  was not restored on the next start.
+- XTest clicks landed on the game: `XQueryPointer` reported child
+  `0x2000001` (the game) at the injector's coordinates, and
+  `XLowerWindow`/`XRaiseWindow`/`XSetInputFocus` didn't change that.
+- `XSendEvent` button events to the injector window worked. After OpenVR and
+  Inject, `/proc/<game>/maps` contained
+  `drive_c/frame26/uevr/UEVRBackend.dll` and `openvr_api.dll`, next to
+  Proton's `vrclient_x64.dll`. UEVR's log:
+
+```text
+[11:17:32.948] Hooking D3D11
+[11:17:33.020] Hooked DirectX 11
+[11:17:34.263] Framework initialized
+[11:17:34.475] [VR] Requested runtime: openvr_api.dll
+[11:17:39.791] UGameViewportClient::Draw called for the first time.
+[11:17:39.792] is stereo enabled called!
+```
+
+It also logged repeated `Failed to initialize Framework on DirectX 12` (probing
+before it chose D3D11) and failed Unreal scans, for example `Failed to locate
+r.EnableStereoEmulation cvar` and `Failed to find FSceneView constructor`.
+SteamVR loaded UEVR's action manifest and `bindings_oculus_touch.json` for
+`steam.app.1067310`. `vrcmd --stats` then showed `"key" :
+"steam.app.1067310"` with `frame_submits` 4439, then 5506 a few seconds later.
+
+A second session's injector exited within about 20 seconds. The third,
+started fresh, injected again (`frame_submits` 1412). After the game was
+stopped, a plain launch had no UEVR modules and no SteamVR scene app. All test
+files were removed.
+
+## Through Frame Control (11:33–11:49)
+
+Local `ui/server.py` against the `frame` alias. First the API, then the
+page's **VR mod** dialog, driven with a headless Chromium:
+
+| Step | Result |
+|---|---|
+| `status` for 2177750 (HL2 VR) | `eligible: false`; `install` refused ("doesn't look like an Unreal Engine game") |
+| `install` for 1067310 | 3 s. Three downloads, hashes matched, receipt written |
+| `start`, game running | First run refused: `the UEVR window is 960 px wide, not 625`. It was measured before WPF laid it out; `start` now waits for the width to settle. Rerun: injected, `frame_submits` 27 (36 s) |
+| `uninstall` while running | Refused: "the game is running; quit it first" |
+| `start`, game not running | Launched the game, injected, `frame_submits` 45 (55 s) |
+| UI: Remove, Install | Worked; the prefix listing matched its pre-install state except an empty `UnrealVRMod`, which uninstall now also removes |
+| UI: Play in VR | Failed once: the injector died with `Process terminated. … Resource name: Arg_AccessViolationException`, after `Fontconfig error: No writable cache directories` (it had no `HOME`). Fixed by keeping the normal environment under the game's (the relaunch-on-failure added next is gone with the GUI injector; see below) |
+| UI: Play in VR ×4 | 4 of 4 injected. The three cold starts took 54, 58 and 58 s; frame submits 56, 71, 80 |
+| UI: Remove | `drive_c`, `AppData/Roaming` and `AppData/Local` listings matched the pre-install state; download cache and receipt gone |
+
+## The GUI injector wasn't reliable (12:02–12:40)
+
+After review fixes, cold starts through the API with UEVR's own injector:
+
+- Batches of 4, 6 and 8 runs: 3/4, 4/6 and 6/8 injected. A retry that
+  relaunched the injector didn't rescue a bad session. In both failures of
+  the last batch, the first injector ignored the clicks and the next two
+  never showed a window within 60 s.
+- Captures of the ignoring injector (`xwd`) showed its first-drawn frame,
+  with OpenVR still unselected. The injector's log had no error.
+
+Lock released at 12:40 before redesigning.
+
+## Frame Control's own injector (12:44–12:52)
+
+`start` now runs `frame_inject.py` under python.org's embeddable Python
+3.14.7 (SHA-256 `d297e5ff…1f15`, matching python.org's release-file API), in
+the game's Wine session. The old install was removed and the new one
+installed without the headset lock, since neither launches anything. The
+prefix listing after removal matched the pre-install state; the new install
+is 47 MB.
+
+| Step | Result |
+|---|---|
+| API `start`, cold | Injected in 35 s, `frame_submits` 39. UEVR log: `Hooked DirectX 11`, `Framework initialized`, `Requested runtime: openvr_api.dll`; `config.txt` has `Frontend_RequestedRuntime=openvr_api.dll` |
+| API `start` ×8, cold | **8/8** injected, 33–34 s each; `frame_submits` 33–42 at the check |
+| UI: dialog while running | "UEVR is running in the game now." Remove disabled (screenshot in `docs/img/uevr-dialog.png`) |
+| UI: Remove → Install → Play in VR → Remove | Each worked; Play in VR injected (`frame_submits` 106 a few seconds later) |
+| After the last Remove | `drive_c`, `AppData/Roaming` and `AppData/Local` listings matched the pre-install state; download cache and receipts gone; no game or `python.exe` processes. The empty `/tmp/frame-control-mods.lock` was deleted by hand (tmpfs) |
+
+Battery 98–100 % on charge. Lock released at 12:52.
+
+## After the second review (13:01–13:03)
+
+`frame_inject.py` now declares every Win32 signature, checks each result,
+frees its remote buffers and closes its handles; uninstall accepts only our
+folder and UEVR's own settings folders. Rechecked: install; three cold starts
+injected in 35, 34 and 33 s (`frame_submits` 42, 38, 47), UEVR logging
+`Framework initialized` and `Requested runtime: openvr_api.dll`; uninstall
+left `drive_c`, `AppData/Roaming` and `AppData/Local` as before, with no cache,
+receipts or processes. Frame Control's injector total: 12 of 12 cold starts
+through the API, plus the UI run.
+
+## Left on the Frame
+
+- Gravitas (free, 7.4 GB, installed 2026-09-28 for this work) is still
+  installed; nothing else from this work is left.
+- No `UEVRInjector.exe` or game processes were left running. Steam and
+  SteamVR were running at the end.
+- The test lock was released at 13:03.

docs/how-the-frame-works.md

@@ -52,6 +52,7 @@ Lepton (Android 11, podman container "lepton-dev") ← its own panel, app 305600
 | The Steam client runs with `-cef-enable-debugging`, so its UI answers Chrome DevTools on loopback `127.0.0.1:8080`. The `SharedJSContext` page has `appStore` (owned apps), `downloadsStore` and `SteamClient.*`. `steam steam://install/<appid>` over SSH installs an owned game; when the options dialog shows (state 7), `SteamClient.Installs.ContinueInstall()` accepts it. **Verified 2026-09-25** with Balatro and Broforce. The Frame rating is `steam_hw_compat_category_packed >> 8 & 3`. | [steam-games.md](steam-games.md), `ui/frame_steam.py` |
 | Chromium Flatpak 154 has **no immersive WebXR**: `navigator.xr` exists, but `isSessionSupported("immersive-vr")` returns `false`. Web VR180 players (DL8/DeoVR embeds) still play video inline as a flat, pannable view, and their VR button opens a tab on immersiveweb.dev. Forcing it doesn't help. `--enable-features=OpenXR,WebXR --force-webxr-runtime=openxr`, with `/opt/steamvr` and `XR_RUNTIME_JSON` exposed to the Flatpak, still returns `false`. The aarch64 Linux binary has no OpenXR code at all (no `XR_RUNTIME_JSON`, `xrGetInstanceProcAddr` or loader strings), even though `chrome://flags` lists `#webxr-runtime` → OpenXR. **Why (verified against source 2026-09-25):** M154 is the first release that compiles OpenXR on Linux (`enable_openxr` includes `is_linux`, `checkout_openxr` is true in Flathub's tarball, and Flathub's GN args don't turn it off). But `content/services/isolated_xr_device/xr_runtime_provider.cc` only creates an OpenXR device under `ENABLE_OPENXR && IS_WIN`, on 154, 155 and `main`. Nothing on Linux calls the OpenXR code, so the linker drops it. The missing pieces are two unmerged Gerrit CLs (bug 506004811): [8132979](https://chromium-review.googlesource.com/c/chromium/src/+/8132979) wires the provider on Linux (with `kOpenXR` still off by default, so it needs `--enable-features=OpenXR`), and [8441736](https://chromium-review.googlesource.com/c/chromium/src/+/8441736) runs the XR service in a sandbox that allows SteamVR's sockets. The Frame does have an aarch64 runtime: `~/.config/openxr/1/active_runtime.json` → SteamVR `bin/linuxarm64/vrclient.so`. To watch in 3D, use a native player, or a Chromium built with those two CLs ([webxr-chromium.md](webxr-chromium.md)). That build (156.0.8071.0, arm64) reports `immersive-vr` as supported and starts a session that SteamVR takes as its scene app. With the headset on, the WebXR samples scene and three.js's stereo 360 video demo showed in 3D (verified 2026-09-26, seccomp sandbox off). Started with `--remote-debugging-port=9222`, Chromium answers DevTools on loopback. **Verified 2026-09-25**, BUILD_ID 20260922.6101926. | Web video, [panels.md](panels.md) |
 | **DeoVR (Steam app 837380, Windows/Unity) runs immersively** under Proton ARM64 + FEX: Unity's OpenVR XR plugin finds `OpenVR Headset(Steam Frame)` and the `frame_controller`, the GPU shows as Turnip Adreno 750, and AVPro Video decodes through `MF-MediaEngine-Hardware`. It played 7680×3840 and 8192×4096 H.265 VR180 SBS streams in dome/fisheye mode (`FirstFrameReady`). Unity's own `VideoPlayer` (used for grid thumbnails) fails with `0xc00d36bb`, so thumbnail previews stay blank. The first launch takes about 45 s (`ComputeShaders: InitAsync`). Log: `compatdata/837380/pfx/drive_c/users/steamuser/AppData/LocalLow/Deo VR/Deo VR/Player.log`. **Verified 2026-09-25**, BUILD_ID 20260922.6101926. | [vr-video.md](vr-video.md) |
+| **A second Windows program can join a running Proton game.** Copy `WINEPREFIX`, `WINEDLLPATH`, `WINEDLLOVERRIDES`, `PATH` (Proton's `files/bin-arm64` comes first) and `DISPLAY` from `/proc/<game pid>/environ`, keeping your own `HOME` and the rest, and run `wine prog.exe` from an ordinary SSH shell. It shares the game's wineserver (outside the pressure-vessel container). Don't copy `WINESERVERSOCKET`, which is an inherited fd. A game's windows live on gamescope's X display for that app (`:1` for Gravitas), where the full-screen game keeps the pointer and focus: XTest clicks and restacking don't reach other windows, but `XSendEvent` button events sent to a window do. `xwd` captures WPF/DXVK windows but shows Vulkan game windows as black. **Verified 2026-09-29**, BUILD_ID 20260925.6191901, Proton 11.0-2c ARM64. | [mods.md](mods.md) |
 | **Wolvic (VR browser APK) runs in Lepton against SteamVR's OpenXR**, with limits. The stock Lynx build aborts (`Runtime doesn't support selected swapChain color format`: it wants `GL_RGBA8`), and the stock Quest build fails with `XR_ERROR_API_VERSION_UNSUPPORTED`. Patching `DeviceDelegateOpenXR::GetSwapChainCreateInfo` in the Lynx build's `libnative-lib.so` to `GL_SRGB8_ALPHA8` (0x8C43) and re-signing fixes start-up. The Gecko engine then segfaults in `libxul`. The Chromium-engine build (Lynx v1.3-chromium) browses fine as an immersive app. Its page reports `isSessionSupported("immersive-vr") == true`, and `requestSession` succeeds, running about 36 rAF/s, but the headset shows **black** for WebXR content, or Wolvic's loading spinner that never clears, until the session is ended. Video decodes on the software `OMX.google.h264.decoder`. Tapping the URL bar's selection menu crashes it (no clipboard service). Open URLs with `am start -a VIEW -n com.igalia.wolvic/.VRBrowserActivity -d <url>` over the instance's ADB. DevTools is at `localabstract:content_shell_devtools_remote`. **Verified 2026-09-25**, BUILD_ID 20260922.6101926. | Web VR video, [apks.md](apks.md) |
 | Tailscale runs without root as a userspace `tailscaled` user service (static arm64 build in `~/.local/share/tailscale`, lingering on). In userspace mode, inbound tailnet connections reach the Frame's **loopback**, so every port, including DevTools on 8080, is reachable from the tailnet. **Verified 2026-09-25.** | [tailscale.md](tailscale.md), `scripts/tailscale-on-frame.sh` |
 | **T3 Code desktop runs natively.** The stock release `T3-Code-0.0.42-arm64.AppImage` in `~/Applications/T3CodeDesktop/` starts with no extra setup: glibc 2.39, `libfuse.so.2`, GTK 3, NSS and libsecret are on the image. `panel-on-frame.sh --name t3code-desktop -- '~/Applications/T3CodeDesktop/T3-Code.AppImage'` gives it its own panel (`valve.steam.desktopgame.2000281357`, `--ozone-platform=x11`). Its bundled server listens on `127.0.0.1:3773` and shows up in onboarding as the `frame` computer, with `passwordStore: gnome-libsecret`. The image has no agent CLI and no `node`. Agents run through the LAN CLIProxyAPI (`llm-proxy.lan:8317`, which resolves on the Frame). Claude Code 2.1.283 comes from `claude.ai/install.sh`, and Codex 0.157.1 from the `codex-aarch64-unknown-linux-musl` release tarball, both into `~/.local/bin`. `with-cliproxy` and a mode-600 `~/.config/cliproxyapi/secrets.env` are copied from the Mac. The wrappers `claude-cliproxy` and `codex-cliproxy` (a `-c model_provider=cliproxy`, `wire_api="responses"`, `env_key="CLIPROXY_API_KEY"`) are set as `providers.claudeAgent.binaryPath` and `providers.codex.binaryPath` in `~/.t3/userdata/settings.json`, and T3 picked that up without a restart. Through the wrappers, `claude auth status` reports `loggedIn: true` (`oauth_token`), and both CLIs answered a prompt with `kimi-k3`. `gamescopectl screenshot` captured another layer (the Lepton T3 app) rather than this panel. `DISPLAY=:0 xwd -id <win>` piped to `ffmpeg` captures the window itself (1920×1080). **Verified 2026-09-26**, BUILD_ID 20260922.6101926. | Running T3 Code as a host on the Frame |

docs/mods.md

@@ -1,11 +1,14 @@
 # Flat-to-VR mods and Beat Saber songs
 
-**Status: feasibility work, not an installer.** Frame Control does not yet
-manage mods or Beat Saber songs. [Issue #26](https://github.com/saphid/frame-control/issues/26)
-stays open: neither UEVR injection nor Beat Saber custom-song playback has
-been verified on this Frame. Alex has an owned copy on a Quest 2; that copy
-has not been inspected. There is no Mods button until the underlying
-install, playback and removal have been checked.
+**Status: UEVR works from Frame Control for Unreal Engine games; Beat Saber
+songs are blocked.** Installed games have a **VR mod** button. It installs
+UEVR, starts the game with UEVR injected, and removes UEVR again. That whole
+loop was run on a real Frame on 2026-09-29 with Gravitas, from the app's own
+UI ([evidence](evidence/mods-2026-09-29.md)). The headset was unworn, so
+the VR image, head tracking and controls haven't been seen yet. Beat Saber
+custom songs need an owned Beat Saber on the Frame, which there isn't
+([below](#beat-saber-songs-first)).
+[Issue #26](https://github.com/saphid/frame-control/issues/26) stays open for those.
 
 The mod manager must be Frame Control's own implementation. Mods and songs
 are permitted third-party content; BSManager, ModsBeforeFriday, MO2 and other
@@ -15,27 +18,87 @@ unofficial mod mirrors are part of this work.
 
 ## Per-game support
 
-Checked 2026-09-28 on SteamOS **0.4.1**, BUILD_ID **20260925.6191901**, aarch64,
-with **Proton 11.0-2c ARM64** and SteamVR **2.18.1**. “Verified” describes only
+Checked 2026-09-28 and 2026-09-29 on SteamOS **0.4.1**, BUILD_ID
+**20260925.6191901**, aarch64, with **Proton 11.0-2c ARM64** and SteamVR **2.18.1**. “Verified” describes only
 the observation stated, not a promise that the game is playable. “Documented”
 means an upstream source describes it; “inferred” means it still needs a test.
 
 | Game / build | Mod or content | Evidence and support status | Next check |
 |---|---|---|---|
 | Half-Life 2: VR Mod – Episode One, Steam 2177750, build 25413453 | Official Steam community mod, shared base depot 658920 build 25413418 | **Verified: startup only.** Already installed; launched through Proton ARM64. The stereo headset capture showed its first-time setup, and SteamVR loaded `bindings_frame.json`. Gameplay, controller interaction, fresh installation and removal are unverified. | Complete first-time setup and play a level before offering a tested install shortcut. |
-| Gravitas, Steam 1067310, Windows | UEVR 1.05 | **Verified: prerequisites and windows only.** Free Steam install completed. The game produced a `SkyArk (64-bit, PCD3D_SM5)` window. UEVR needed .NET; with official .NET 6.0.36 libraries it produced a `UEVR` window. A combined run exited 1 with X11 errors before injection was verified. **Inferred: compatibility remains unknown**, not proven broken. | Retry during a stable headset session; verify injection, stereo scene output, controls and removal. |
+| Gravitas, Steam 1067310, Windows, Unreal Engine 4 | UEVR 1.05, from Frame Control | **Verified 2026-09-29: installs, injects, SteamVR receives frames, removes cleanly.** Twelve cold **Play in VR** runs (33–35 s each), and the full cycle from the app's UI, all loaded `UEVRBackend.dll` into the game, with UEVR logging `Hooked DirectX 11` and `Requested runtime: openvr_api.dll`. SteamVR's compositor counted frame submits for `steam.app.1067310`. Remove restored the prefix to its pre-install file listing. **Not seen:** the stereo image, head tracking and controls (headset unworn). | Wear the headset: check the image, tracking, UEVR's in-headset menu and controller input. |
 | Beat Saber, Steam 620980, Windows / Proton | Basic custom songs; later SongCore and version-matched mods | **Verified: absent from the 868-game library returned by this Frame.** Store metadata lists Windows, not Linux. **Documented:** the PC game reads basic maps from `Beat Saber_Data/CustomLevels` without a mod manager. Playback on Frame is unverified. | An already-owned, legitimately installed copy is required. Do not buy it as part of this task. |
 | Beat Saber, claimed native ARM64 build | Custom songs / native mods | **Inferred: unverified.** The research mentions this build but supplies no verified official distributable or tested layout. CPU architecture alone does not identify Android versus Linux, the game version or the mod ABI. | Establish official provenance, ownership, binary type and version before touching files. Do not apply Quest patches to an unidentified build. |
-| Beat Saber, Alex's Quest 2 copy | Custom songs / Android mods | **Documented: owner-reported copy on Quest 2**, currently charging. No APK, version or installed mods inspected; no Frame playback verified. This does not establish ownership of the Steam build. | When the Quest is available, inspect the owned copy's version and supported transfer path, then test Lepton/OpenXR compatibility without bypassing entitlement checks. |
+| Beat Saber, Alex's Quest 2 copy | Custom songs / Android mods | **Documented: owner-reported copy on Quest 2.** Not reachable on 2026-09-29 (no device on `adb` from the Mac). No APK, version or installed mods inspected; no Frame playback verified. A Quest copy is a Meta store purchase; copying it to another headset would need its entitlement check to pass there, which this work won't work around. This does not establish ownership of the Steam build. | When the Quest is available, inspect the owned copy's version and supported transfer path, then test Lepton/OpenXR compatibility without bypassing entitlement checks. |
 | Hogwarts Legacy, Steam 990080 | R.E.A.L. | **Verified: listed in this Frame's owned library, not installed.** Official release access and redistribution permission were not established; the referenced author Patreon page returned HTTP 403. No archive downloaded or game tested. | Obtain a current free release from the author and confirm its terms before any test. A news report saying “free” is not a redistribution grant. |
 | Horizon Zero Dawn, Steam 1151640; Horizon Forbidden West, Steam 2420110 | R.E.A.L. | **Verified: both listed as owned, neither installed.** Same source/permission blocker as above; runtime support is unverified. | Check each game's supported version against an accessible official release. |
 | Half-Life 2 VR / other OpenVR games | OpenComposite, per-game replacement | **Documented:** forwards OpenVR calls to OpenXR. **Inferred: Frame compatibility unknown.** Not installed or tested. HL2 VR reached setup with the shipped OpenVR path already. | Test a specific game and replacement DLL only if needed; preserve its original DLL. Never switch the shared headset's runtime globally. |
 | Doom / Quake / Half-Life Team Beef ports | Author's VR ports plus separately owned or free game data | **Inferred: untested.** Android ARM64 support does not establish OpenXR extension or controller compatibility on Lepton. | Choose an official release and legally usable data set, then test that exact port. |
 | Skyrim VR, Steam 611670 | SKSEVR / HIGGS / PLANCK stack | **Verified: Skyrim VR is absent from this library.** Owning flat Skyrim or Special Edition is not the VR game's entitlement. Runtime and mod support are unverified. | An already-owned VR copy and version-matched official mod releases are required. |
 
-The [test record](evidence/mods-2026-09-28.md) distinguishes process startup,
-visible output and failures. It also records a SteamVR restart during the
-shared session, which prevents attributing the failed UEVR attempt to FEX.
+The test records ([2026-09-28](evidence/mods-2026-09-28.md),
+[2026-09-29](evidence/mods-2026-09-29.md)) distinguish process startup,
+visible output, injection and failures.
+
+## UEVR from Frame Control
+
+![The VR mod dialog while UEVR runs in Gravitas](img/uevr-dialog.png)
+
+**Get games → an installed game → VR mod.** The dialog says whether the game
+can take UEVR, then offers **Install UEVR**, **▶ Play in VR** and **Remove
+UEVR**. The server route is `POST /api/mods {"action": "status" | "install" |
+"start" | "uninstall", "appid": …}`, and the work happens on the Frame in
+[`ui/frame_mods.py`](../ui/frame_mods.py). It uses only the standard library,
+like `frame_steam.py`.
+
+- **Which games.** Unreal Engine games, recognised by their
+  `…/Binaries/Win64/*-Win64-Shipping.exe` (inferred as the general rule; checked
+  with Gravitas, and HL2 VR is correctly refused). The game needs a Proton
+  prefix, so it must have been played once.
+- **Install.** Downloads praydog's [UEVR 1.05 release](https://github.com/praydog/UEVR/releases/tag/1.05)
+  and python.org's [Windows x64 embeddable Python 3.14.7](https://www.python.org/downloads/release/python-3147/).
+  Each is checked against a pinned SHA-256; Python's comes from python.org's
+  release-file API. Archives are unpacked into a staging folder, rejecting
+  entries that escape it, symlinks and oversized contents, then moved into
+  `<prefix>/drive_c/frame-control/` (about 47 MB). Nothing goes into the
+  game's own folder. A receipt in `~/.local/share/frame-control/mods/` lists
+  what to remove, including UEVR's own settings folders only if they didn't
+  exist before. Install and remove refuse while the game is running, and only
+  one mod action runs at a time.
+- **Play in VR.** Launches the game through Steam if it isn't running and
+  waits for its window. It then runs a short script under that Python, with
+  the game's Proton, prefix and Wine settings read from the game process, so
+  both share one Wine session. The script repeats what UEVR's own injector does
+  when you press Inject with OpenVR chosen: load `UEVRPluginNullifier.dll` and
+  call its `nullify`, load `openvr_api.dll`, set `Frontend_RequestedRuntime` in
+  UEVR's per-game `config.txt`, then load `UEVRBackend.dll`. Each load is a
+  `LoadLibraryW` remote thread, as in the frontend's `Injector.cs`. `start`
+  then checks that `UEVRBackend.dll` is mapped into the game and reads
+  SteamVR's frame count for the app (`vrcmd --stats`).
+- **Remove.** Deletes what the receipt lists, then the download cache once
+  no game uses it. Verified: the prefix's file listing matched its
+  pre-install state afterwards.
+
+Why not UEVR's own injector (verified 2026-09-29):
+
+- It's a .NET 6 WPF app, so it needs Microsoft's .NET runtimes (about 70 MB
+  of downloads) in the prefix.
+- Under gamescope, the full-screen game keeps the pointer and focus. XTest
+  clicks, raising or refocusing the injector window don't change that, so in
+  the headset you can't click it. Sending X `ButtonPress`/`ButtonRelease`
+  events straight to its window does work.
+- `--attach=<process>` didn't inject under Wine, and it didn't restore its
+  saved OpenVR choice.
+- Driven that way, it injected in 6 of 8 cold starts. In a bad session every
+  new injector ignored input or never showed its window, even after
+  relaunching. Its process list reads each process's main window title, a
+  cross-process window message; a window that isn't answering would block its
+  UI thread (inferred from the frontend's source, not proven). Without a
+  `HOME` it also died in .NET at startup.
+- Frame Control's own script injected in 12 of 12 cold starts through the API, in 33–35 s, and again from the UI.
+- UEVR's DirectX 12 probing logs errors before it settles on DirectX 11 for
+  Gravitas, and some of its Unreal engine scans fail on this older UE4 game.
+  Neither stopped the injection.
 
 ## Beat Saber: songs first
 
@@ -62,7 +125,10 @@ or dependency for Frame Control.
 
 ## Requirements for our manager
 
-These are **planned**, not implemented or verified:
+For UEVR, items 1–5 are implemented in `frame_mods.py` and covered by
+fake-library tests (`tests/test_mods.py`), apart from checking ownership
+through Steam; item 6 is met for Gravitas. Beat Saber songs would need the
+same, and none of it is built for them:
 
 1. Resolve the selected Steam game's real library, installed build, executable
    architecture and Proton prefix. Confirm ownership through Steam; a directory
@@ -91,7 +157,11 @@ These are **planned**, not implemented or verified:
 - [UEVR 1.05 official release](https://github.com/praydog/UEVR/releases/tag/1.05)
   and [author's usage instructions](https://github.com/praydog/UEVR#getting-started).
 - [Microsoft .NET 6 release metadata](https://builds.dotnet.microsoft.com/dotnet/release-metadata/6.0/releases.json),
-  including the SHA-512 hashes used for the test runtimes.
+  including the SHA-512 hashes used for the injector tests.
+- [UEVR frontend source](https://github.com/praydog/UEVR-Frontend): `UEVR/MainWindow.xaml.cs`
+  (`Inject_Clicked`) and `UEVR/Injector.cs`, the steps `frame_inject.py` follows.
+- [python.org release-file API](https://www.python.org/api/v2/downloads/release_file/) for the
+  embeddable Python's `sha256_sum`.
 - [OpenComposite's OpenXR branch](https://gitlab.com/znixian/OpenOVR/-/tree/openxr),
   including per-game installation and the need to preserve original DLLs.
 - [R.E.A.L. author post referenced by the research](https://www.patreon.com/realvr/posts/but-wheres-link-165840151)

docs/sidequest.md

@@ -65,6 +65,8 @@ flow, not evidence of an anonymous download API. It is not implemented here.
 - `search()` raises a user-readable `SourceError` with the browse URL (zero
   limit returns no rows). It does not invent app results or report a false
   “no matching games”. The aggregate search UI should surface this source error.
+  In the app, Discover doesn't link to it; the **Sources** dialog lists SideQuest
+  with a link to its website instead of an on/off switch.
 - `details()` accepts a numeric listing id and returns its canonical page link,
   `downloadable: False`, empty versions/tags/headsets and the `images` shape
   `{icon: None, banner: None, screenshots: []}`. Name is explicitly a listing id;

docs/steam-games.md

@@ -4,9 +4,9 @@ Frame Control's **Get games** section lists the games you own with each one's
 Steam Frame rating, installs them on the Frame, and searches the Steam store.
 This page covers how it works underneath, so you can do the same from a shell.
 
-For flat-to-VR mods and Beat Saber custom songs, see the
-[per-game feasibility table](mods.md). Mod support is separate from Steam's
-Frame rating; there is no mod installer yet.
+Installed Unreal Engine games also have a **VR mod** button that installs,
+starts and removes UEVR; see [VR mods](mods.md) for how it works and the
+per-game table. Mod support is separate from Steam's Frame rating.
 
 ## How it works
 

docs/streaming.md

@@ -151,10 +151,13 @@ two fingers to scroll, two-finger tap to right-click) plus a text field that
 types on the Frame. On a computer, clicking the pad passes your mouse and
 keyboard through to the Frame until you press Esc (⌘ is sent as Ctrl on a Mac).
 
-It goes through **KDE Connect**, the first-party route (KDE makes the Frame's
-desktop): Frame Control's server runs [`ui/frame_input_agent.py`](../ui/frame_input_agent.py)
-on the Frame, which talks KDE Connect's own LAN protocol to the Frame's
-`kdeconnectd` as if it were a phone. KDE Connect does the typing and clicking.
+Since Control (below), the pad goes through **gamescope's own input socket**
+([`ui/frame_touch.py`](../ui/frame_touch.py)), so it reaches whichever panel has
+focus, Steam's own menus included, and needs nothing installed on the Frame.
+Only characters that aren't on a US keyboard (accents, emoji) go through
+**KDE Connect** as below; it starts the first time you type one. (Before
+Control, everything went through KDE Connect, which is why the notes below
+describe it in detail.)
 
 **Verified 2026-09-28** (SteamOS 0.4.1, build 20260925.6191901):
 

tests/page/store_detail.mjs

@@ -19,8 +19,8 @@ function grab(name) {
   fail(`unbalanced ${name}`);
 }
 const names = ["esc", "storeName", "storeHue", "storeInitial", "storeText", "storeOpenSource", "sourcePage", "storeImage",
-               "storeArt", "storeIcon", "sourceMark", "currentOffer", "detailBadges", "renderAppDetail", "renderAppDetailBody",
-               "updateInstall", "openStoreApp", "loadOfferDetails"];
+               "GLYPH_VR", "GLYPH_APP", "RUNS", "storeRuns", "storeKind", "storeArt", "storeIcon", "sourceMark", "currentOffer", "detailBadges", "renderAppDetail", "renderAppDetailBody",
+               "updateInstall", "openStoreApp", "loadOfferDetails", "installStoreApp"];
 const code = names.map(grab).join("");
 
 // A fake page: elements by id. The install panel's elements exist only while
@@ -34,8 +34,10 @@ function page(api = async () => ({})) {
   const document = { activeElement: null, querySelector: () => null };
   const console = { error() {} };
   const calls = [];
-  const fns = new Function("$", "sourceState", "document", "console", "api", code + "; return { renderAppDetail, openStoreApp };")(
-    $, sourceState, document, console, (...a) => { calls.push(a); return api(...a); });
+  const fns = new Function("$", "sourceState", "document", "console", "api", "runJob", "loadAndroid", "act", "window", code + "; return { renderAppDetail, openStoreApp };")(
+    $, sourceState, document, console, (...a) => { calls.push(a); return api(...a); },
+    async (title, key, work) => work(), () => {}, async (title, work) => work(),
+    { open() { fail("an in-app installation opened an external page"); } });
   return { els, sourceState, calls, ...fns };
 }
 
@@ -68,7 +70,7 @@ const offer = { source: "fdroid", id: "org.example.brush", source_name: "F-Droid
 {
   const p = page(async () => { throw new Error("offline"); });
   p.sourceState.apps = [{ name: "Broken", offers: [] }];
-  await p.openStoreApp(0);
+  await p.openStoreApp(0, true);
   if (!p.els.appDetail.open || !p.els.detailBody.innerHTML.includes('role="alert"')) fail("broken listing didn't open with the error");
   if (p.calls.length) fail("asked for details of a listing that couldn't render");
 }
@@ -90,4 +92,18 @@ const offer = { source: "fdroid", id: "org.example.brush", source_name: "F-Droid
   if (!p.els.detailBody.innerHTML.includes('id="detailTitle">Open Brush<')) fail("page lost after a failed details request");
   if (!p.els.detailInstallNote.textContent.includes("couldn't be refreshed")) fail("no note after a failed details request");
 }
+// The featured Install starts a new or failed job, while a job already running or
+// installed opens its details without another install or a launch command.
+for (const [job, expected] of [[null, 1], [{ done: false }, 0],
+    [{ done: true, result: { package: offer.package } }, 0], [{ done: true, error: "offline" }, 1]]) {
+  const p = page(async path => path === "/api/sources/install" ? { package: offer.package } : {});
+  p.sourceState.apps = [{ name: "Open Brush", offers: [{ ...offer }] }];
+  if (job) p.sourceState.jobs.set(`${offer.source}:${offer.id}`, job);
+  await p.openStoreApp(0, true);
+  if (!p.els.appDetail.open || !p.els.detailBody.innerHTML.includes('id="detailInstall"')) fail("hero installation didn't open details");
+  const installs = p.calls.filter(([path]) => path === "/api/sources/install");
+  if (installs.length !== expected) fail(`expected ${expected} installation requests, got ${installs.length}`);
+  if (installs.some(([, body]) => body.source !== offer.source || body.id !== offer.id)) fail("installed a different offer");
+  if (p.calls.some(([path]) => path === "/api/android")) fail("hero Install launched an already installed app");
+}
 console.log("ok");

tests/test_input.py

@@ -18,6 +18,7 @@ import tempfile
 import threading
 import time
 import unittest
+from unittest import mock
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parent.parent
@@ -631,3 +632,257 @@ class PageQueue(unittest.TestCase):
 
 if __name__ == "__main__":
     unittest.main()
+
+
+class PadEvents(unittest.TestCase):
+    """The trackpad and key row go through gamescope; accents and emoji go the KDE Connect way."""
+
+    @classmethod
+    def setUpClass(cls):
+        import server
+        cls.pad = staticmethod(server.pad_events)
+
+    def test_moves_clicks_and_scroll(self):
+        out, extra = self.pad([{"dx": 3, "dy": -2}, {"singleclick": True}, {"singlehold": True},
+                               {"singlerelease": True}, {"scroll": True, "dy": 1}, {"rightclick": True}])
+        self.assertEqual(out[0], {"dx": 3, "dy": -2})
+        self.assertEqual(out[1:3], [{"button": "left", "down": True}, {"button": "left", "down": False}])
+        self.assertEqual(out[3:5], [{"button": "left", "down": True}, {"button": "left", "down": False}])
+        self.assertEqual(out[5], {"scroll": [0, -15]})  # up = content follows the finger
+        self.assertEqual(out[6:], [{"button": "right", "down": True}, {"button": "right", "down": False}])
+        self.assertEqual(extra, [])
+
+    def test_keys_and_modifiers(self):
+        out, _ = self.pad([{"specialKey": 12}, {"specialKey": 1, "ctrl": True}, {"key": "c", "ctrl": True}])
+        self.assertEqual(out[:2], [{"key": 28, "down": True}, {"key": 28, "down": False}])
+        self.assertEqual([e["key"] for e in out[2:6]], [29, 14, 14, 29])  # Ctrl+Backspace
+        self.assertEqual([(e["key"], e["down"]) for e in out[6:]],
+                         [(29, True), (46, True), (46, False), (29, False)])  # Ctrl+C
+
+    def test_text_stays_ascii_through_gamescope(self):
+        out, slow = self.pad([{"key": "Hi "}, {"key": "there"}])
+        self.assertEqual(out, [{"text": "Hi there"}])
+        self.assertEqual(slow, [])
+
+    def test_keyboard_goes_to_kde_whole_and_in_order(self):
+        events = [{"key": "a"}, {"key": "é"}, {"specialKey": 12}, {"key": "c", "ctrl": True}, {"dx": 2, "dy": 1}]
+        out, slow = self.pad(events, kde=True)
+        self.assertEqual(out, [{"dx": 2, "dy": 1}])  # the pointer still goes through gamescope
+        self.assertEqual(slow, events[:4])  # the keyboard as sent, in order
+
+    def test_shifted_key_with_modifier(self):
+        out, _ = self.pad([{"key": "A", "ctrl": True}])
+        self.assertEqual([e["key"] for e in out], [29, 42, 30, 30, 42, 29])
+
+
+class PadDelivery(unittest.TestCase):
+    """remote_input's promises: "sent" means the whole batch is taken; accents go once, in order."""
+
+    class Agent:
+        def __init__(self, sent=True, state="ready"):
+            self.sent, self.state, self.got = sent, state, []
+
+        def send(self, events):
+            if events and self.sent:
+                self.got.append(events)
+            return {"state": self.state, "sent": self.sent and bool(events)}
+
+    def setUp(self):
+        import server
+        self.s = server
+        self.saved = (server._touch, server._input, server.KDE_WAIT)
+        server._touch, server._input = self.Agent(), self.Agent()
+        self.reset()
+
+    def tearDown(self):
+        self.s._touch, self.s._input, self.s.KDE_WAIT = self.saved
+        self.settle()
+        self.reset()
+
+    def reset(self):
+        self.s._kde_queue.clear()
+        self.s._kde_until = self.s._typed_until = 0.0
+        self.s._kde_worker[0] = None
+
+    def settle(self):
+        worker = self.s._kde_worker[0]
+        if worker:
+            worker.join(5)
+
+    def typed(self):
+        return [e for batch in self.s._input.got for e in batch]
+
+    def test_accent_only_batch_is_acknowledged_and_typed_once(self):
+        status = self.s.remote_input({"events": [{"key": "é"}]})
+        self.assertTrue(status["sent"])  # so the page doesn't send it again
+        self.settle()
+        self.assertEqual(self.typed(), [{"key": "é"}])
+
+    def test_mixed_text_stays_in_one_ordered_stream(self):
+        self.s.remote_input({"events": [{"key": "aéb"}, {"specialKey": 12}]})
+        self.settle()
+        self.assertEqual(self.typed(), [{"key": "aéb"}, {"specialKey": 12}])
+        self.assertEqual(self.s._touch.got, [])  # none of it split off through gamescope
+
+    def test_batch_gamescope_didnt_take_is_not_queued(self):
+        self.s._touch = self.Agent(sent=False, state="starting")
+        status = self.s.remote_input({"events": [{"dx": 1, "dy": 1}, {"key": "é"}]})
+        self.assertFalse(status["sent"])  # the page tries the whole batch again...
+        self.assertEqual(self.s._kde_queue, [])  # ...so the accent isn't queued twice
+
+    def test_waits_for_kde_connect_then_sends_without_more_input(self):
+        self.s._input = self.Agent(sent=False, state="starting")
+        self.s.remote_input({"events": [{"key": "é"}]})
+        time.sleep(0.2)
+        self.assertEqual(self.s._kde_queue, [{"key": "é"}])
+        self.s._input.sent = True
+        self.settle()
+        self.assertEqual(self.typed(), [{"key": "é"}])
+        self.assertEqual(self.s._kde_queue, [])
+
+    def test_later_ascii_waits_behind_a_pending_accent(self):
+        self.s._input = self.Agent(sent=False, state="starting")
+        self.s.remote_input({"events": [{"key": "é"}]})
+        self.s.remote_input({"events": [{"key": "x"}]})
+        self.assertEqual(self.s._touch.got, [])  # "x" can't overtake the "é"
+        self.assertEqual(self.s._kde_queue, [{"key": "é"}, {"key": "x"}])
+        self.s._input.sent = True
+        self.settle()
+        self.assertEqual(self.typed(), [{"key": "é"}, {"key": "x"}])
+
+    def test_queue_is_bounded_and_dropped_on_error(self):
+        self.s._input = self.Agent(sent=False, state="error")
+        self.s.remote_input({"events": [{"key": "é"}] * 150})
+        self.s.remote_input({"events": [{"key": "é"}] * 150})
+        self.settle()
+        self.assertEqual(self.s._kde_queue, [])
+        self.s._input = self.Agent(sent=False, state="starting")
+        self.s.KDE_WAIT = 0.3
+        self.s.remote_input({"events": [{"key": "é"}] * 150})
+        self.s.remote_input({"events": [{"key": "é"}] * 150})
+        self.assertLessEqual(len(self.s._kde_queue), self.s.KDE_QUEUE_LIMIT)
+        self.settle()
+        self.assertEqual(self.s._kde_queue, [])
+
+    def test_ascii_just_after_an_accent_stays_behind_it(self):
+        self.s.remote_input({"events": [{"key": "é"}]})
+        self.settle()
+        self.s.remote_input({"events": [{"key": "x"}]})  # KDE Connect may still be typing the é
+        self.settle()
+        self.assertEqual(self.s._touch.got, [])
+        self.assertEqual(self.typed(), [{"key": "é"}, {"key": "x"}])
+
+    def test_accent_just_after_gamescope_text_waits_for_it(self):
+        self.s.remote_input({"events": [{"key": "x" * 50}]})
+        self.assertEqual(self.s._touch.got, [[{"text": "x" * 50}]])
+        start = time.time()
+        self.s.remote_input({"events": [{"key": "é"}]})
+        self.settle()
+        self.assertGreater(time.time() - start, 0.6)  # 50 keys at 16 ms, plus the margin
+        self.assertEqual(self.typed(), [{"key": "é"}])
+
+    def test_typing_time_counts_every_key_transition(self):
+        t = self.s.typing_seconds
+        self.assertAlmostEqual(t([{"text": "ab"}]), 4 * 0.008)
+        self.assertAlmostEqual(t([{"text": "A"}]), 4 * 0.008)  # shift down, key down, key up, shift up
+        self.assertAlmostEqual(t([{"text": "x" * 500}]), 8.0)  # a long paste
+        self.assertAlmostEqual(t([{"key": 29, "down": True}, {"dx": 3, "dy": 0}]), 0.008)
+
+    def test_the_margin_is_added_once_not_per_request(self):
+        for _ in range(10):
+            self.s.remote_input({"events": [{"key": "ab"}]})
+        # ten requests of 4 transitions each: the work queues up, with no margin added per request
+        self.assertLess(self.s._typed_until - time.time(), 10 * 4 * 0.008 + 0.05)
+
+    def test_trimming_while_sending_doesnt_drop_unsent_events(self):
+        slow = self.Agent()
+        gate = threading.Event()
+        send = slow.send
+
+        def held(events):
+            gate.wait(5)
+            return send(events)
+        slow.send = held
+        self.s._input = slow
+        self.s.remote_input({"events": [{"key": "é"}] * 150})
+        time.sleep(0.2)  # the worker has taken its 150 and is mid-send
+        self.s.remote_input({"events": [{"key": "ü"}] * 150})
+        gate.set()
+        self.settle()
+        sent = self.typed()
+        self.assertEqual(sent[:150], [{"key": "é"}] * 150)
+        self.assertEqual(sent[150:], [{"key": "ü"}] * 150)  # none of the new ones went missing
+
+    def test_input_queued_as_the_worker_finishes_is_still_sent(self):
+        for _ in range(40):
+            self.reset()
+            self.s._input.got.clear()
+            self.s.remote_input({"events": [{"key": "é"}]})
+            time.sleep(0.002)
+            self.s.remote_input({"events": [{"key": "ü"}]})
+            self.settle()
+            self.assertEqual(self.s._kde_queue, [])
+            self.assertEqual(self.typed(), [{"key": "é"}, {"key": "ü"}])
+
+
+class PadRoute(unittest.TestCase):
+    def setUp(self):
+        import server
+        self.s = server
+        self.agents = mock.patch.multiple(server, _touch=mock.Mock(), _input=mock.Mock())
+        self.agents.start()
+        self.addCleanup(self.agents.stop)
+        self.s._touch.send.return_value = {"state": "ready", "sent": True}
+        self.s._input.send.return_value = {"state": "ready", "sent": True}
+        self.s.reset_pad_route()
+        self.s._touch.reset_mock(); self.s._input.reset_mock()
+        self.addCleanup(self.s.reset_pad_route)
+
+    def switch(self):
+        with mock.patch.multiple(self.s, FRAME="frame-a", HOST_OPTS=[], MUX=[], SSH=[], macview=None), \
+             mock.patch.multiple(self.s.frame_android, FRAME="frame-a", SSH_OPTS=[]):
+            self.s.route("frame-b", [])
+
+    def test_switch_stops_both_input_agents_and_discards_old_queue(self):
+        self.s._kde_queue.append({"key": "old"})
+        self.s._kde_until = self.s._typed_until = time.time() + 60
+        cancel = self.s._kde_cancel
+        self.switch()
+        self.s._input.stop.assert_called_once()
+        self.s._touch.stop.assert_called_once()
+        self.assertEqual(self.s._kde_queue, [])
+        self.assertEqual((self.s._kde_until, self.s._typed_until), (0, 0))
+        self.assertTrue(cancel.is_set())
+
+    def test_switch_cancels_delayed_and_retrying_text_before_new_input(self):
+        for delaying in (True, False):
+            with self.subTest(delaying=delaying):
+                waiting, cancel = threading.Event(), threading.Event()
+                class ObservedCancel:
+                    def wait(self, timeout):
+                        waiting.set()
+                        return cancel.wait(timeout)
+                    def set(self):
+                        cancel.set()
+                self.s.reset_pad_route()
+                self.s._kde_cancel = ObservedCancel()
+                self.s._typed_until = time.time() + 60 if delaying else 0
+                self.s._input.reset_mock()
+                self.s._input.send.return_value = {"state": "starting", "sent": False}
+                self.s.remote_input({"events": [{"key": "é"}]})
+                worker = self.s._kde_worker[0]
+                self.assertTrue(waiting.wait(1), "worker never reached its cancellable delay")
+                self.switch()
+                worker.join(1)
+                self.assertFalse(worker.is_alive())
+                attempts = self.s._input.send.call_count
+                self.assertEqual(attempts, 0 if delaying else 1)
+                self.s._input.send.return_value = {"state": "ready", "sent": True}
+                self.s.remote_input({"events": [{"key": "ü"}]})
+                next_worker = self.s._kde_worker[0]
+                if next_worker:
+                    next_worker.join(1)
+                    self.assertFalse(next_worker.is_alive())
+                self.assertEqual(self.s._input.send.call_count, attempts + 1)
+                self.assertEqual(self.s._input.send.call_args.args[0], [{"key": "ü"}])
+                self.assertEqual(self.s._kde_queue, [])

tests/test_mods.py

@@ -0,0 +1,337 @@
+"""VR mod (UEVR) checks that need no headset or network: a fake Steam library on disk.
+
+Run: python3 -m unittest discover -s tests
+"""
+import hashlib
+import io
+import itertools
+import json
+import stat
+import subprocess
+import sys
+import tempfile
+import unittest
+import zipfile
+from pathlib import Path
+from unittest import mock
+
+ROOT = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(ROOT / "ui"))
+
+import frame_mods  # noqa: E402
+import test_server  # noqa: E402  (not `from … import`, or unittest runs ServerGuards twice)
+
+APPID = 1067310
+
+
+def zip_bytes(files, links=()):
+    buf = io.BytesIO()
+    with zipfile.ZipFile(buf, "w") as z:
+        for name, data in files.items():
+            z.writestr(name, data)
+        for name in links:
+            info = zipfile.ZipInfo(name)
+            info.external_attr = (stat.S_IFLNK | 0o777) << 16
+            z.writestr(info, "/etc/passwd")
+    return buf.getvalue()
+
+
+@unittest.skipIf(sys.platform == "win32", "the helper runs on the Frame (Linux): /proc, flock and POSIX prefix paths")
+class FakeLibrary(unittest.TestCase):
+    """A Steam library with Gravitas's real layout, and pinned downloads served from memory."""
+
+    def setUp(self):
+        tmp = tempfile.TemporaryDirectory()
+        self.addCleanup(tmp.cleanup)
+        home = Path(tmp.name)
+        self.steam = home / ".local/share/Steam"
+        apps = self.steam / "steamapps"
+        (apps / "common/Gravitas/SkyArk/Binaries/Win64").mkdir(parents=True)
+        (apps / "common/Gravitas/SkyArk/Binaries/Win64/Drop-Win64-Shipping.exe").write_bytes(b"MZ" * 100)
+        (apps / "common/Gravitas/Drop.exe").write_bytes(b"MZ")
+        self.prefix = apps / f"compatdata/{APPID}/pfx"
+        for sub in ("Roaming", "Local"):
+            (self.prefix / "drive_c/users/steamuser/AppData" / sub).mkdir(parents=True)
+        (apps / f"appmanifest_{APPID}.acf").write_text(
+            f'"AppState"\n{{\n\t"appid"\t\t"{APPID}"\n\t"name"\t\t"Gravitas"\n\t"installdir"\t\t"Gravitas"\n}}\n')
+        for name, value in (("STEAM", self.steam), ("CACHE", home / ".cache/frame-control/mods"),
+                            ("RECEIPTS", home / ".local/share/frame-control/mods")):
+            p = mock.patch.object(frame_mods, name, value)
+            p.start()
+            self.addCleanup(p.stop)
+        self.running = None
+        p = mock.patch.object(frame_mods, "game_pid", side_effect=lambda exe: self.running)
+        p.start()
+        self.addCleanup(p.stop)
+        self.downloads = {frame_mods.UEVR["url"]: zip_bytes({"UEVRInjector.exe": b"MZ", "UEVRBackend.dll": b"MZ",
+                                                             "openvr_api.dll": b"MZ"})}
+        self.downloads[frame_mods.PYTHON["url"]] = zip_bytes({"python.exe": b"MZ", "python314.zip": b"PK"})
+        self.pin(self.downloads)
+
+    def pin(self, downloads):
+        """Serve these bytes and pin their real hashes in place of the published ones."""
+        for name in ("UEVR", "PYTHON"):
+            pinned = getattr(frame_mods, name)
+            p = mock.patch.object(frame_mods, name,
+                                  dict(pinned, sha256=hashlib.sha256(downloads[pinned["url"]]).hexdigest()))
+            p.start()
+            self.addCleanup(p.stop)
+        p = mock.patch.object(frame_mods.urllib.request, "urlopen",
+                              side_effect=lambda url, timeout: io.BytesIO(downloads[url]))
+        self.urlopen = p.start()
+        self.addCleanup(p.stop)
+
+    def managed(self):
+        return self.prefix / "drive_c/frame-control"
+
+
+class Status(FakeLibrary):
+    def test_unreal_game_is_eligible_and_not_installed(self):
+        st = frame_mods.status(APPID)
+        self.assertEqual((st["eligible"], st["exe"], st["installed"], st["running"], st["prefix"]),
+                         (True, "Drop-Win64-Shipping.exe", False, False, True))
+
+    def test_game_without_unreal_binary_is_refused(self):
+        (self.steam / "steamapps/common/Gravitas/SkyArk/Binaries/Win64/Drop-Win64-Shipping.exe").unlink()
+        self.assertFalse(frame_mods.status(APPID)["eligible"])
+        with self.assertRaisesRegex(frame_mods.Fail, "Unreal Engine"):
+            frame_mods.install(APPID)
+        self.urlopen.assert_not_called()
+
+    def test_uninstalled_game(self):
+        with self.assertRaisesRegex(frame_mods.Fail, "isn't installed"):
+            frame_mods.status(620)
+
+
+class InstallUninstall(FakeLibrary):
+    def test_install_then_uninstall_leaves_prefix_as_found(self):
+        before = sorted(p.relative_to(self.prefix) for p in self.prefix.rglob("*"))
+        res = frame_mods.install(APPID)
+        self.assertTrue(res["installed"])
+        self.assertTrue((self.managed() / "uevr-1.05/UEVRBackend.dll").is_file())
+        self.assertTrue((self.managed() / "python-3.14.7/python.exe").is_file())
+        self.assertIn("UEVRBackend.dll", (self.managed() / "python-3.14.7/frame_inject.py").read_text())
+        self.assertFalse(list(self.managed().glob(".staging-*")))
+        # What UEVR writes on its first injection.
+        roaming = self.prefix / "drive_c/users/steamuser/AppData/Roaming/UnrealVRMod/Drop-Win64-Shipping"
+        roaming.mkdir(parents=True)
+        (roaming / "log.txt").write_text("x")
+        (self.prefix / "drive_c/users/steamuser/AppData/Local/praydog/x").mkdir(parents=True)
+        frame_mods.uninstall(APPID)
+        after = sorted(p.relative_to(self.prefix) for p in self.prefix.rglob("*"))
+        self.assertEqual(after, before)
+        self.assertFalse(frame_mods.CACHE.exists(), "the downloads go once no game uses them")
+        self.assertIsNone(frame_mods.read_receipt(APPID))
+
+    def test_existing_uevr_settings_survive_uninstall(self):
+        profile = self.prefix / "drive_c/users/steamuser/AppData/Roaming/UnrealVRMod/Drop-Win64-Shipping"
+        profile.mkdir(parents=True)
+        (profile / "config.txt").write_text("mine")
+        frame_mods.install(APPID)
+        frame_mods.uninstall(APPID)
+        self.assertEqual((profile / "config.txt").read_text(), "mine")
+
+    def test_second_install_is_a_no_op(self):
+        frame_mods.install(APPID)
+        calls = self.urlopen.call_count
+        self.assertIn("already installed", frame_mods.install(APPID)["message"])
+        self.assertEqual(self.urlopen.call_count, calls)
+
+    def test_refuses_while_game_runs(self):
+        self.running = 4242
+        with self.assertRaisesRegex(frame_mods.Fail, "running"):
+            frame_mods.install(APPID)
+        self.running = None
+        frame_mods.install(APPID)
+        self.running = 4242
+        with self.assertRaisesRegex(frame_mods.Fail, "running"):
+            frame_mods.uninstall(APPID)
+        self.assertTrue((self.managed() / "uevr-1.05").is_dir())
+
+    def test_needs_a_prefix(self):
+        import shutil
+        shutil.rmtree(self.prefix.parent)
+        with self.assertRaisesRegex(frame_mods.Fail, "play it once"):
+            frame_mods.install(APPID)
+
+    def test_receipt_cannot_point_outside_the_prefix(self):
+        frame_mods.install(APPID)
+        r = frame_mods.read_receipt(APPID)
+        victim = self.steam / "steamapps/common/Gravitas"
+        r["remove"].append(str(self.prefix / "../../../common/Gravitas"))
+        frame_mods.receipt_path(APPID).write_text(json.dumps(r))
+        with self.assertRaisesRegex(frame_mods.Fail, "didn't create"):
+            frame_mods.uninstall(APPID)
+        self.assertTrue(victim.is_dir())
+        self.assertTrue((self.managed() / "uevr-1.05").is_dir(), "nothing removed when the receipt is bad")
+
+
+    def test_receipt_cannot_delete_other_things_in_the_prefix(self):
+        frame_mods.install(APPID)
+        r = frame_mods.read_receipt(APPID)
+        users = self.prefix / "drive_c/users"
+        r["remove"].append(str(users))
+        frame_mods.receipt_path(APPID).write_text(json.dumps(r))
+        with self.assertRaisesRegex(frame_mods.Fail, "didn't create"):
+            frame_mods.uninstall(APPID)
+        self.assertTrue(users.is_dir())
+
+    def test_failed_removal_keeps_the_receipt(self):
+        frame_mods.install(APPID)
+        with mock.patch.object(frame_mods.shutil, "rmtree"):  # e.g. a permission error, swallowed
+            with self.assertRaisesRegex(frame_mods.Fail, "couldn't remove"):
+                frame_mods.uninstall(APPID)
+        self.assertIsNotNone(frame_mods.read_receipt(APPID), "Remove can be tried again")
+        frame_mods.uninstall(APPID)
+        self.assertFalse(self.managed().exists())
+
+    def test_receipt_cannot_name_another_prefix(self):
+        frame_mods.install(APPID)
+        r = frame_mods.read_receipt(APPID)
+        r["prefix"] = "/"
+        frame_mods.receipt_path(APPID).write_text(json.dumps(r))
+        with self.assertRaisesRegex(frame_mods.Fail, "isn't app"):
+            frame_mods.uninstall(APPID)
+        self.assertTrue((self.managed() / "uevr-1.05").is_dir())
+
+
+class Downloads(FakeLibrary):
+    def test_hash_mismatch_deletes_and_installs_nothing(self):
+        self.downloads[frame_mods.UEVR["url"]] = zip_bytes({"UEVRBackend.dll": b"tampered"})
+        with self.assertRaisesRegex(frame_mods.Fail, "doesn't match"):
+            frame_mods.install(APPID)
+        self.assertFalse((frame_mods.CACHE / "UEVR.zip").exists())
+        self.assertFalse(self.managed().exists())
+        self.assertIsNone(frame_mods.read_receipt(APPID))
+
+    def test_archive_escaping_its_folder_is_refused(self):
+        for bad in (zip_bytes({"UEVRBackend.dll": b"MZ", "../../evil.dll": b"MZ"}),
+                    zip_bytes({"UEVRBackend.dll": b"MZ"}, links=["openvr_api.dll"])):
+            downloads = dict(self.downloads, **{frame_mods.UEVR["url"]: bad})
+            self.pin(downloads)
+            with self.subTest(), self.assertRaises(frame_mods.Fail):
+                frame_mods.install(APPID)
+            self.assertFalse((self.prefix / "drive_c/evil.dll").exists())
+            self.assertFalse(list(self.managed().glob("*")) if self.managed().exists() else [])
+            import shutil
+            shutil.rmtree(frame_mods.CACHE, ignore_errors=True)
+
+    def test_oversized_archive_is_refused(self):
+        with mock.patch.object(frame_mods, "MAX_UNPACKED", 3):
+            with self.assertRaisesRegex(frame_mods.Fail, "more than expected"):
+                frame_mods.install(APPID)
+
+
+    def test_oversized_download_is_stopped(self):
+        with mock.patch.object(frame_mods, "MAX_DOWNLOAD", 10):
+            with self.assertRaisesRegex(frame_mods.Fail, "bigger than expected"):
+                frame_mods.install(APPID)
+        self.assertFalse(list(frame_mods.CACHE.glob("*")))
+
+
+class Actions(FakeLibrary):
+    def test_one_change_at_a_time(self):
+        import fcntl
+        lock = Path(tempfile.mkdtemp()) / "mods.lock"
+        with mock.patch.object(frame_mods, "LOCK", lock), open(lock, "w") as held:
+            fcntl.flock(held, fcntl.LOCK_EX)
+            with self.assertRaisesRegex(frame_mods.Fail, "another mod action"):
+                frame_mods.main(["install", str(APPID)])
+            self.assertFalse(frame_mods.status(APPID)["installed"])
+            self.assertEqual(frame_mods.main(["status", str(APPID)])["appid"], APPID, "status never waits")
+
+    def test_zero_frames_is_an_answer(self):
+        stats = json.dumps([{"key": f"steam.app.{APPID}", "frame_submits": 0}, {"operation": "status"}])
+        with mock.patch.object(frame_mods.subprocess, "run", return_value=mock.Mock(stdout=stats)):
+            self.assertEqual(frame_mods.wait("frames", 5, lambda: frame_mods.frame_submits(APPID)), 0)
+        with mock.patch.object(frame_mods.subprocess, "run", return_value=mock.Mock(stdout='{"odd": 1}')):
+            self.assertIsNone(frame_mods.frame_submits(APPID))
+
+
+class Start(FakeLibrary):
+    def environ(self, text):
+        """The game's /proc/<pid>/environ; every other file reads normally."""
+        real = frame_mods.Path.read_text
+        return mock.patch.object(frame_mods.Path, "read_text", autospec=True, side_effect=lambda path, *a, **k:
+                                 text if str(path).startswith("/proc/") else real(path, *a, **k))
+
+    def test_needs_install_first(self):
+        with self.assertRaisesRegex(frame_mods.Fail, "isn't installed"):
+            frame_mods.start(APPID)
+
+    def run_start(self, reply, loaded=(False, True, True, True)):
+        frame_mods.install(APPID)
+        self.running = 4242
+        env = "WINEPREFIX=/x\0DISPLAY=:1\0WINESERVERSOCKET=17\0PATH=/p\0"
+        with self.environ(env), \
+                mock.patch.object(frame_mods, "loaded", side_effect=list(loaded) + [True] * 5), \
+                mock.patch.object(frame_mods, "x11_windows", return_value=[(1, "SkyArk", 1280)]), \
+                mock.patch.object(frame_mods.subprocess, "run", return_value=mock.Mock(stdout=reply, stderr="")) as run, \
+                mock.patch.object(frame_mods, "frame_submits", return_value=7), \
+                mock.patch.object(frame_mods.time, "sleep"):
+            return frame_mods.start(APPID), run
+
+    def test_injects_with_the_games_wine_settings(self):
+        res, run = self.run_start('noise\n{"pid": 320}\n')
+        self.assertEqual((res["frame_submits"], res["message"]), (7, "UEVR injected into Gravitas; SteamVR is receiving its frames"))
+        cmd, env = run.call_args.args[0], run.call_args.kwargs["env"]
+        self.assertEqual(cmd[:2], ["wine", "C:\\frame-control\\python-3.14.7\\python.exe"])
+        self.assertEqual(cmd[3:], ["Drop-Win64-Shipping.exe", "C:\\frame-control\\uevr-1.05",
+                                   "C:\\users\\steamuser\\AppData\\Roaming\\UnrealVRMod\\Drop-Win64-Shipping"])
+        self.assertEqual(env["WINEPREFIX"], "/x")
+        self.assertNotIn("WINESERVERSOCKET", env, "an inherited fd number means nothing to a new process")
+        self.assertIn("HOME", env, "fontconfig needs a HOME for its cache")
+
+    def test_reports_the_injection_error(self):
+        with self.assertRaisesRegex(frame_mods.Fail, "couldn't open"):
+            self.run_start('{"error": "couldn\'t open Drop-Win64-Shipping.exe (5)"}\n')
+
+    def test_success_is_checked_in_the_game(self):
+        with self.assertRaisesRegex(frame_mods.Fail, "has no UEVRBackend.dll"):
+            with mock.patch.object(frame_mods.time, "time", side_effect=itertools.count(0, 5)):
+                self.run_start('{"pid": 320}\n', loaded=[False] * 40)
+
+    def test_inject_script_is_valid_python(self):
+        compile(frame_mods.INJECT_PY, "frame_inject.py", "exec")
+
+
+class Helper(unittest.TestCase):
+    @unittest.skipIf(sys.platform == "win32", "uninstall takes the flock lock, which only exists on the Frame (Linux)")
+    def test_unexpected_errors_are_still_json(self):
+        # A receipt from another version, without "exe": a KeyError, not a traceback.
+        script = (ROOT / "ui" / "frame_mods.py").read_text().replace(
+            "def read_receipt(appid):", "def read_receipt(appid):\n    return {'prefix': '/x'}\n\n\ndef _unused(appid):")
+        out = subprocess.run([sys.executable, "-", "uninstall", "1"], input=script,
+                             capture_output=True, text=True, timeout=30, env={"HOME": tempfile.mkdtemp()})
+        self.assertEqual(out.returncode, 1, out.stderr)
+        self.assertIn("KeyError", json.loads(out.stdout)["error"])
+
+    def test_bad_usage_prints_json_error(self):
+        for args in ([], ["install"], ["install", "12x"], ["remove", "620"]):
+            out = subprocess.run([sys.executable, str(ROOT / "ui" / "frame_mods.py"), *args],
+                                 capture_output=True, text=True, timeout=30)
+            self.assertEqual(out.returncode, 1, args)
+            self.assertIn("error", json.loads(out.stdout), args)
+
+
+class ModRoutes(test_server.ServerGuards):
+    """Reuses ServerGuards' server (unresolvable SSH alias); validation runs before any SSH."""
+
+    def test_mod_input_validation(self):
+        for body in ({"action": "install", "appid": "1; reboot"}, {"action": "install", "appid": ""},
+                     {"action": "delete", "appid": "1067310"}, {"appid": "1067310"}):
+            status, payload = self.post("/api/mods", body)
+            self.assertEqual(status, 400, f"{body} -> {payload}")
+
+    def test_needs_custom_header(self):
+        self.assertEqual(self.request("POST", "/api/mods", {"action": "status", "appid": "1"})[0], 403)
+
+    def test_runs_the_mods_helper_with_its_timeout(self):
+        import server
+        with mock.patch.object(server, "steam_frame", return_value={"ok": 1}) as run:
+            self.assertEqual(server.mods({"action": "install", "appid": "1067310"}), {"ok": 1})
+        run.assert_called_once_with("install", "1067310", timeout=600, script="frame_mods.py")
+
+
+for name in [n for n in dir(test_server.ServerGuards) if n.startswith("test_")]:
+    setattr(ModRoutes, name, None)

tests/test_page_scripts.py

@@ -0,0 +1,141 @@
+"""The page's inline scripts share one global scope, so a second top-level function or
+variable with a name already used replaces the first everywhere, silently."""
+import html.parser
+import json
+import pathlib
+import shutil
+import subprocess
+import unittest
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+
+# Compiles the scripts as one strict-mode block. There, functions are block scoped like let
+# and const, so V8 itself rejects a name declared twice in the shared scope (however it's
+# indented or declared: function, class, let, const, destructuring), while helpers with the
+# same name inside different functions stay legal. var is the exception (declaring one twice
+# is allowed), so the page doesn't use var at all: Node's own copy of the acorn parser finds
+# real var declarations, not the word in comments, strings or CSS var().
+DUPLICATES = r'''
+const vm = require('vm');
+const scripts = JSON.parse(require('fs').readFileSync(0, 'utf8'));
+try { new vm.Script('"use strict"; {\n' + scripts.join('\n;\n') + '\n}'); console.log('ok'); }
+catch (e) { console.log(e.message); }
+'''
+VARS = r'''
+const scripts = JSON.parse(require('fs').readFileSync(0, 'utf8'));
+let acorn, walk;
+try {
+  acorn = require('internal/deps/acorn/acorn/dist/acorn');
+  walk = require('internal/deps/acorn/acorn-walk/dist/walk');
+} catch { console.log('no parser'); process.exit(0); }
+for (const code of scripts) {
+  let found = null;
+  try {
+    walk.simple(acorn.parse(code, { ecmaVersion: 'latest' }), {
+      VariableDeclaration(n) { if (n.kind === 'var' && !found) found = code.slice(n.start, n.end).slice(0, 40); },
+    });
+  } catch (e) { console.log(e.message); process.exit(0); }
+  if (found) { console.log('declares with var: ' + found); process.exit(0); }
+}
+console.log('ok');
+'''
+
+
+def node(script, scripts, *flags):
+    r = subprocess.run(['node', *flags, '-e', script], input=json.dumps(scripts), capture_output=True, text=True)
+    return r.stdout.strip() or r.stderr.strip()
+
+
+def check(scripts):
+    """'ok', or V8's message for the first name declared twice."""
+    return node(DUPLICATES, scripts)
+
+
+def check_vars(scripts):
+    """'ok', or the first var declaration. Skips where Node doesn't include acorn."""
+    out = node(VARS, scripts, '--expose-internals')
+    if out == 'no parser':
+        raise unittest.SkipTest("this Node doesn't include acorn")
+    return out
+
+
+class ClassicScripts(html.parser.HTMLParser):
+    """The page's inline classic scripts: no src, and no type other than a JavaScript one (a
+    module has its own scope, and JSON data isn't code). The types a browser runs as script:
+    https://mimesniff.spec.whatwg.org/#javascript-mime-type"""
+    JS = {'', 'application/ecmascript', 'application/javascript', 'application/x-ecmascript',
+          'application/x-javascript', 'text/ecmascript', 'text/javascript', 'text/javascript1.0',
+          'text/javascript1.1', 'text/javascript1.2', 'text/javascript1.3', 'text/javascript1.4',
+          'text/javascript1.5', 'text/jscript', 'text/livescript', 'text/x-ecmascript', 'text/x-javascript'}
+
+    def __init__(self):
+        super().__init__()
+        self.scripts, self.current = [], None
+
+    def handle_starttag(self, tag, attrs):
+        if tag == 'script':
+            a = dict(attrs)
+            inline = 'src' not in a and (a.get('type') or '').strip().lower() in self.JS
+            self.current = [] if inline else None
+
+    def handle_data(self, data):
+        if self.current is not None:
+            self.current.append(data)
+
+    def handle_endtag(self, tag):
+        if tag == 'script' and self.current is not None:
+            self.scripts.append(''.join(self.current))
+        if tag == 'script':
+            self.current = None
+
+
+def classic_scripts(page):
+    p = ClassicScripts()
+    p.feed(page)
+    return p.scripts
+
+
+@unittest.skipUnless(shutil.which('node'), 'Node parses the page scripts')
+class PageScripts(unittest.TestCase):
+    def test_no_top_level_name_is_declared_twice(self):
+        scripts = classic_scripts((ROOT / 'ui/index.html').read_text(encoding='utf-8'))
+        self.assertGreaterEqual(len(scripts), 2)
+        self.assertEqual(check(scripts), 'ok')
+
+    def test_the_page_declares_nothing_with_var(self):
+        scripts = classic_scripts((ROOT / 'ui/index.html').read_text(encoding='utf-8'))
+        self.assertEqual(check_vars(scripts), 'ok')
+
+    def test_the_check_finds_what_it_should(self):
+        twice = {
+            'indented function': ['function loadPanels() {}', '  async function loadPanels() {}'],
+            'class': ['class Panel {}', 'class Panel {}'],
+            'destructured': ['const { a, b } = {};', 'let [b] = [];'],
+            'later declarator': ['let x = 1;', 'const y = 2, x = 3;'],
+            'function and const': ['function f() {}', 'const f = 1;'],
+        }
+        for what, scripts in twice.items():
+            with self.subTest(what):
+                self.assertIn('already been declared', check(scripts))
+        helpers = ['function a() { function help() {} }', 'function b() { const help = 1; }']
+        self.assertEqual(check(helpers), 'ok')
+
+    def test_the_var_check_finds_what_it_should(self):
+        # var: legal to declare twice, so not allowed at all; however it's written.
+        for code in ['var x = 1;', 'var/*c*/x = 1;', 'var {x} = {x: 1};', 'function f() { var y; }']:
+            with self.subTest(code):
+                self.assertIn('declares with var', check_vars([code]))
+        # The word var elsewhere is fine.
+        text = ['// var x\nconst a = "var y", b = `var ${a}`, c = "color: var(--blue)", d = {}.var;']
+        self.assertEqual(check_vars(text), 'ok')
+
+    def test_only_inline_classic_scripts_are_checked(self):
+        page = ('<script>let a;</script><script type="module">export const m = 1;</script>'
+                '<script type="application/json">{"b": 1}</script><script src = "x.js"></script>'
+                '<script data-src="y" type="text/javascript">let c;</script>'
+                '<script type="text/ecmascript">let d;</script><script type=" Application/X-JavaScript ">let e;</script>')
+        self.assertEqual(classic_scripts(page), ['let a;', 'let c;', 'let d;', 'let e;'])
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_touch.py

@@ -150,6 +150,14 @@ class Apply(unittest.TestCase):
         self.assertFalse(self.t.STALE[0])
         self.assertEqual(self.said[-1][1].get("stale"), None)
 
+    def test_stale_survives_a_bare_release(self):
+        gs = FakeGamescope()
+        panel = self.t.apply(gs, {"button": "left", "down": True, "window": 99, "display": ":1"}, None)
+        self.assertTrue(self.t.STALE[0])
+        self.t.apply(gs, {"button": "left", "down": False}, panel)  # the page's release names no panel
+        self.assertTrue(self.t.STALE[0])
+        self.assertEqual(self.said[-1][1].get("stale"), True)
+
     def test_same_window_id_on_the_other_display_is_another_panel(self):
         gs = FakeGamescope()
         self.t.apply(gs, {"fx": 0.5, "fy": 0.5, "window": 7, "display": ":0"}, None)

ui/frame_mods.py

@@ -0,0 +1,532 @@
+#!/usr/bin/env python3
+"""Runs ON the Frame (piped over SSH): UEVR, a flat-to-VR mod for Unreal games.
+
+Usage: python3 - status APPID     # can UEVR run here, is it installed, is the game running
+       python3 - install APPID    # download the pinned official release into the game's prefix
+       python3 - start APPID      # launch the game if needed, inject UEVR, confirm SteamVR frames
+       python3 - uninstall APPID  # remove exactly what install (and UEVR's first run) created
+Prints one JSON object. Errors are {"error": "..."} with exit status 1.
+
+Verified 2026-09-29 on SteamOS 0.4.1 (build 20260925.6191901), Proton 11.0
+ARM64 and SteamVR 2.18.1 with Gravitas (1067310): after injection the game has
+UEVRBackend.dll loaded and SteamVR counts frame submits for it. Stereo image,
+head tracking and controls were not seen: the headset was unworn (docs/mods.md).
+
+UEVR's own injector (a .NET WPF app) is not used. Under Wine and FEX it hung
+or ignored input in about one session in four, and gamescope keeps real input
+away from it. Instead the official Windows embeddable Python runs INJECT_PY in
+the game's Wine session, doing what the injector does on Inject.
+
+Nothing here is bundled. UEVR comes from praydog's GitHub release and Python
+from python.org, each checked against a pinned hash. Files live in
+<prefix>/drive_c/frame-control, never in the game's own folder, and a receipt
+records what to remove.
+"""
+import hashlib
+import json
+import os
+import re
+import shutil
+import subprocess
+import sys
+import time
+import urllib.request
+import zipfile
+from pathlib import Path
+
+HOME = Path.home()
+STEAM = HOME / ".local/share/Steam"
+CACHE = HOME / ".cache/frame-control/mods"
+RECEIPTS = HOME / ".local/share/frame-control/mods"
+LOCK = Path("/tmp/frame-control-mods.lock")  # tmpfs: gone at reboot, never left in ~
+VRCMD = "/opt/steamvr/bin/linuxarm64/vrcmd"
+MANAGED = "frame-control"  # drive_c/<this> inside the game's prefix
+
+UEVR = {"version": "1.05", "dir": "uevr-1.05",
+        "url": "https://github.com/praydog/UEVR/releases/download/1.05/UEVR.zip",
+        "sha256": "af4f2f91306802d7ee4e8497d483a547ac8e9a3067dbafb81324100524215d3c"}
+# Windows x64 embeddable Python, to run INJECT_PY. Hash from python.org's
+# release-file API (sha256_sum).
+PYTHON = {"version": "3.14.7", "dir": "python-3.14.7",
+          "url": "https://www.python.org/ftp/python/3.14.7/python-3.14.7-embed-amd64.zip",
+          "sha256": "d297e5ff019966817ad8502465176139f2d3d840fa4ed84b13bed399a6ab1f15"}
+MAX_UNPACKED = 200 << 20  # the two archives unpack to about 50 MB
+MAX_DOWNLOAD = 50 << 20  # each archive is 7–13 MB
+
+# The game's environment a second program needs to join its Wine session. Not
+# WINESERVERSOCKET and friends: those are inherited file descriptors.
+GAME_ENV = re.compile(r"(WINEPREFIX|WINEDLLPATH|WINEDLLOVERRIDES|WINEFSYNC|WINEDEBUG|PATH|DISPLAY|"
+                      r"XDG_RUNTIME_DIR|PROTON_VR_RUNTIME|FEX_APP_CONFIG|FEX_APP_CONFIG_LOCATION|"
+                      r"SteamAppId|SteamGameId|STEAM_COMPAT_DATA_PATH|WINE_LARGE_ADDRESS_AWARE)=")
+
+
+# Runs under Windows Python in the game's Wine session: the steps of UEVR
+# 1.05's frontend (UEVR/MainWindow.xaml.cs Inject_Clicked, UEVR/Injector.cs)
+# with "Nullify VR plugins" on and the OpenVR runtime. Prints one JSON line.
+INJECT_PY = r"""
+import ctypes, json, os, sys
+from ctypes import wintypes as W
+exe, uevr, profile = sys.argv[1:4]
+k32 = ctypes.WinDLL("kernel32", use_last_error=True)
+H, P, SZ = W.HANDLE, ctypes.c_void_p, ctypes.c_size_t
+for name, res, args in (
+        ("OpenProcess", H, [W.DWORD, W.BOOL, W.DWORD]),
+        ("CloseHandle", W.BOOL, [H]),
+        ("VirtualAllocEx", P, [H, P, SZ, W.DWORD, W.DWORD]),
+        ("VirtualFreeEx", W.BOOL, [H, P, SZ, W.DWORD]),
+        ("WriteProcessMemory", W.BOOL, [H, P, P, SZ, P]),
+        ("CreateRemoteThread", H, [H, P, SZ, P, P, W.DWORD, P]),
+        ("WaitForSingleObject", W.DWORD, [H, W.DWORD]),
+        ("GetModuleHandleW", W.HMODULE, [W.LPCWSTR]),
+        ("LoadLibraryW", W.HMODULE, [W.LPCWSTR]),
+        ("FreeLibrary", W.BOOL, [W.HMODULE]),
+        ("GetProcAddress", P, [W.HMODULE, ctypes.c_char_p]),
+        ("CreateToolhelp32Snapshot", H, [W.DWORD, W.DWORD]),
+        ("Process32FirstW", W.BOOL, [H, P]), ("Process32NextW", W.BOOL, [H, P]),
+        ("Module32FirstW", W.BOOL, [H, P]), ("Module32NextW", W.BOOL, [H, P])):
+    fn = getattr(k32, name)
+    fn.restype, fn.argtypes = res, args
+INVALID = ctypes.c_void_p(-1).value
+
+class Entry(ctypes.Structure):  # PROCESSENTRY32W
+    _fields_ = [("size", W.DWORD), ("usage", W.DWORD), ("pid", W.DWORD), ("heap", ctypes.c_void_p),
+                ("module", W.DWORD), ("threads", W.DWORD), ("parent", W.DWORD), ("prio", ctypes.c_long),
+                ("flags", W.DWORD), ("name", W.WCHAR * 260)]
+
+class Module(ctypes.Structure):  # MODULEENTRY32W
+    _fields_ = [("size", W.DWORD), ("mid", W.DWORD), ("pid", W.DWORD), ("glbl", W.DWORD), ("proc", W.DWORD),
+                ("base", ctypes.c_void_p), ("bytes", W.DWORD), ("handle", W.HMODULE),
+                ("name", W.WCHAR * 256), ("path", W.WCHAR * 260)]
+
+def fail(msg):
+    print(json.dumps({"error": f"{msg} (Windows error {ctypes.get_last_error()})"})); sys.exit(1)
+
+def snapshot(flags, pid, entry, first, next_, match):
+    snap = k32.CreateToolhelp32Snapshot(flags, pid)
+    if not snap or snap == INVALID:
+        fail("couldn't list processes")
+    try:
+        entry.size = ctypes.sizeof(entry)
+        ok = first(snap, ctypes.byref(entry))
+        while ok:
+            if match(entry):
+                return entry
+            ok = next_(snap, ctypes.byref(entry))
+    finally:
+        k32.CloseHandle(snap)
+
+def remote_call(proc, fn, arg, wait_ms):
+    t = k32.CreateRemoteThread(proc, None, 0, fn, arg, 0, None)
+    if not t:
+        fail("CreateRemoteThread failed")
+    try:
+        return k32.WaitForSingleObject(t, wait_ms) == 0  # WAIT_OBJECT_0
+    finally:
+        k32.CloseHandle(t)
+
+def inject(proc, pid, name):
+    path = os.path.join(uevr, name)
+    data = ctypes.create_unicode_buffer(path)
+    mem = k32.VirtualAllocEx(proc, None, ctypes.sizeof(data), 0x3000, 0x04)  # commit|reserve, read/write
+    if not mem:
+        fail(f"couldn't allocate in {exe}")
+    try:
+        if not k32.WriteProcessMemory(proc, mem, data, ctypes.sizeof(data), None):
+            fail(f"couldn't write into {exe}")
+        load = k32.GetProcAddress(k32.GetModuleHandleW("kernel32.dll"), b"LoadLibraryW")
+        if not remote_call(proc, load, mem, 30000):
+            fail(f"loading {name} into {exe} didn't finish in 30 s")
+    finally:
+        k32.VirtualFreeEx(proc, mem, 0, 0x8000)  # MEM_RELEASE
+    m = snapshot(0x18, pid, Module(), k32.Module32FirstW, k32.Module32NextW,  # TH32CS_SNAPMODULE | SNAPMODULE32
+                 lambda m: m.path.lower() == path.lower())
+    if not m:
+        fail(f"{name} didn't load into {exe}")
+    return path, m.base
+
+e = snapshot(2, 0, Entry(), k32.Process32FirstW, k32.Process32NextW,  # TH32CS_SNAPPROCESS
+             lambda e: e.name.lower() == exe.lower())
+if not e:
+    fail(f"{exe} isn't running")
+pid = e.pid
+proc = k32.OpenProcess(0x1F0FFF, False, pid)  # PROCESS_ALL_ACCESS
+if not proc:
+    fail(f"couldn't open {exe}")
+path, base = inject(proc, pid, "UEVRPluginNullifier.dll")
+local = k32.LoadLibraryW(path)
+fn = local and k32.GetProcAddress(local, b"nullify")
+if not fn:
+    fail("couldn't find UEVRPluginNullifier.dll's nullify")
+offset = fn - local  # same DLL, same layout in both processes
+k32.FreeLibrary(local)
+# The frontend waits 2 s for nullify and carries on either way; so do we, but say so.
+nullified = remote_call(proc, base + offset, None, 2000)
+inject(proc, pid, "openvr_api.dll")
+# The frontend saves the runtime choice in the per-game config before UEVRBackend reads it.
+os.makedirs(profile, exist_ok=True)
+cfg = os.path.join(profile, "config.txt")
+lines = open(cfg).read().splitlines() if os.path.exists(cfg) else []
+lines = [l for l in lines if not l.startswith("Frontend_RequestedRuntime=")] + ["Frontend_RequestedRuntime=openvr_api.dll"]
+open(cfg, "w").write("\n".join(lines) + "\n")
+inject(proc, pid, "UEVRBackend.dll")
+k32.CloseHandle(proc)
+print(json.dumps({"pid": pid, "nullified": nullified}))
+"""
+
+
+class Fail(Exception):
+    pass
+
+
+def libraries():
+    """Steam library folders: the default one plus any in libraryfolders.vdf."""
+    libs = [STEAM]
+    try:
+        text = (STEAM / "steamapps/libraryfolders.vdf").read_text(errors="replace")
+        libs += [Path(p.replace("\\\\", "\\")) for p in re.findall(r'"path"\s+"([^"]+)"', text)]
+    except OSError:
+        pass
+    seen, out = set(), []
+    for lib in libs:
+        key = os.path.realpath(lib)
+        if key not in seen:
+            seen.add(key)
+            out.append(lib)
+    return out
+
+
+def game(appid):
+    """Where the game is installed and its Proton prefix, from its app manifest."""
+    for lib in libraries():
+        manifest = lib / f"steamapps/appmanifest_{appid}.acf"
+        try:
+            text = manifest.read_text(errors="replace")
+        except OSError:
+            continue
+        m = re.search(r'"installdir"\s+"([^"]+)"', text)
+        if not m:
+            continue
+        name = re.search(r'"name"\s+"([^"]*)"', text)
+        return {"name": name.group(1) if name else str(appid),
+                "dir": lib / "steamapps/common" / m.group(1),
+                "prefix": lib / f"steamapps/compatdata/{appid}/pfx"}
+    raise Fail(f"app {appid} isn't installed on this Frame")
+
+
+def shipping_exe(game_dir):
+    """The Unreal Engine game binary (…/Binaries/Win64/*-Win64-Shipping.exe), or None."""
+    found = [p for p in game_dir.glob("*/Binaries/Win64/*.exe") if p.name.lower().endswith("-win64-shipping.exe")]
+    found += [p for p in game_dir.glob("Binaries/Win64/*.exe") if p.name.lower().endswith("-win64-shipping.exe")]
+    return max(found, key=lambda p: p.stat().st_size) if found else None
+
+
+def game_pid(exe_name):
+    """The running Wine process for this .exe (its cmdline is the Windows path)."""
+    want = "\\" + exe_name.lower()
+    for d in Path("/proc").iterdir():
+        if not d.name.isdigit():
+            continue
+        try:
+            cmd = (d / "cmdline").read_bytes().split(b"\0")[0].decode(errors="replace").lower()
+        except OSError:
+            continue
+        if cmd.endswith(want):
+            return int(d.name)
+    return None
+
+
+def loaded(pid, name):
+    try:
+        return any(line.rstrip().endswith("/" + name) for line in open(f"/proc/{pid}/maps"))
+    except OSError:
+        return False
+
+
+def receipt_path(appid):
+    return RECEIPTS / f"{appid}-uevr.json"
+
+
+def read_receipt(appid):
+    try:
+        return json.loads(receipt_path(appid).read_text())
+    except (OSError, ValueError):
+        return None
+
+
+def managed_dir(g):
+    return g["prefix"] / "drive_c" / MANAGED
+
+
+def user_dirs(g, exe):
+    """What UEVR itself writes into the prefix when it first runs."""
+    user = g["prefix"] / "drive_c/users/steamuser/AppData"
+    return {"profile": user / "Roaming/UnrealVRMod" / exe.stem,  # per-game settings and log.txt
+            "injector": user / "Local/praydog"}                  # the injector's own settings
+
+
+def status(appid):
+    g = game(appid)
+    exe = shipping_exe(g["dir"])
+    r = read_receipt(appid)
+    pid = game_pid(exe.name) if exe else None
+    return {"appid": appid, "name": g["name"], "mod": "UEVR", "version": UEVR["version"],
+            "eligible": bool(exe), "exe": exe.name if exe else None,
+            "prefix": g["prefix"].is_dir(), "installed": bool(r),
+            "running": bool(pid), "injected": bool(pid and loaded(pid, "UEVRBackend.dll"))}
+
+
+def fetch(url, digest, algo):
+    """Download into the cache once, and check its hash every time it's used."""
+    CACHE.mkdir(parents=True, exist_ok=True)
+    path = CACHE / url.rsplit("/", 1)[1]
+    if not path.exists():
+        part = path.with_suffix(path.suffix + ".part")
+        try:
+            with urllib.request.urlopen(url, timeout=60) as r, open(part, "wb") as f:
+                for block in iter(lambda: r.read(1 << 20), b""):
+                    if f.tell() + len(block) > MAX_DOWNLOAD:
+                        raise Fail(f"{url} is bigger than expected; stopped the download")
+                    f.write(block)
+        except (OSError, Fail) as e:
+            part.unlink(missing_ok=True)
+            raise Fail(f"download failed: {url}: {e}")
+        part.rename(path)
+    h = hashlib.new(algo)
+    with open(path, "rb") as f:
+        for block in iter(lambda: f.read(1 << 20), b""):
+            h.update(block)
+    if h.hexdigest() != digest:
+        path.unlink()
+        raise Fail(f"{path.name} doesn't match its published {algo}; deleted it, try again")
+    return path
+
+
+def unpack(archive, dest, budget):
+    """Extract a ZIP into dest, refusing anything that would land outside it."""
+    root = os.path.realpath(dest)
+    with zipfile.ZipFile(archive) as z:
+        for info in z.infolist():
+            target = os.path.realpath(os.path.join(dest, info.filename))
+            if target != root and not target.startswith(root + os.sep):
+                raise Fail(f"{archive.name} has an entry outside its folder: {info.filename}")
+            if (info.external_attr >> 16) & 0o170000 == 0o120000:
+                raise Fail(f"{archive.name} contains a symlink: {info.filename}")
+            budget -= info.file_size
+            if budget < 0:
+                raise Fail(f"{archive.name} unpacks to more than expected")
+        z.extractall(dest)
+    return budget
+
+
+def install(appid):
+    g = game(appid)
+    exe = shipping_exe(g["dir"])
+    if not exe:
+        raise Fail(f"{g['name']} doesn't look like an Unreal Engine game (no *-Win64-Shipping.exe), so UEVR can't hook it")
+    if not g["prefix"].is_dir():
+        raise Fail(f"{g['name']} has no Proton prefix yet; play it once, then add the mod")
+    if game_pid(exe.name):
+        raise Fail(f"{g['name']} is running; quit it first")
+    if read_receipt(appid):
+        return {"message": f"UEVR {UEVR['version']} is already installed for {g['name']}", **status(appid)}
+    archives = [(fetch(UEVR["url"], UEVR["sha256"], "sha256"), UEVR["dir"])]
+    archives.append((fetch(PYTHON["url"], PYTHON["sha256"], "sha256"), PYTHON["dir"]))
+    base = managed_dir(g)
+    dirs = user_dirs(g, exe)
+    fresh = [str(d) for d in (dirs["profile"].parent, base) if not d.exists()]  # remove on uninstall if empty
+    stage = base / f".staging-{os.getpid()}"
+    shutil.rmtree(stage, ignore_errors=True)
+    try:
+        budget = MAX_UNPACKED
+        for archive, sub in archives:
+            budget = unpack(archive, stage / sub, budget)
+        for need in (stage / UEVR["dir"] / "UEVRBackend.dll", stage / PYTHON["dir"] / "python.exe"):
+            if not need.is_file():
+                raise Fail(f"the download has no {need.name}")
+        if game_pid(exe.name):  # it may have started during the download
+            raise Fail(f"{g['name']} started; quit it first")
+        (stage / PYTHON["dir"] / "frame_inject.py").write_text(INJECT_PY)
+        for sub in (UEVR["dir"], PYTHON["dir"]):
+            shutil.rmtree(base / sub, ignore_errors=True)
+            (stage / sub).rename(base / sub)
+    finally:
+        shutil.rmtree(stage, ignore_errors=True)
+        if str(base) in fresh:
+            try:
+                base.rmdir()  # only succeeds if the install failed and left it empty
+            except OSError:
+                pass
+    receipt = {"appid": appid, "mod": "UEVR", "version": UEVR["version"], "exe": exe.name,
+               "installed": int(time.time()), "prefix": str(g["prefix"]),
+               "remove": [str(base / UEVR["dir"]), str(base / PYTHON["dir"])],
+               # Parents that didn't exist yet (UEVR makes UnrealVRMod), deepest first.
+               "remove_if_empty": fresh,
+               # UEVR creates these on first injection. Remove them on uninstall
+               # only if they weren't there before, so earlier settings survive.
+               "remove_if_created": {k: str(v) for k, v in dirs.items() if not v.exists()},
+               "sources": [UEVR["url"], PYTHON["url"]]}
+    RECEIPTS.mkdir(parents=True, exist_ok=True)
+    tmp = receipt_path(appid).with_suffix(".tmp")
+    tmp.write_text(json.dumps(receipt, indent=1))
+    tmp.rename(receipt_path(appid))
+    return {"message": f"Installed UEVR {UEVR['version']} for {g['name']}", **status(appid)}
+
+
+def x11_windows(display):
+    """(id, name, width) for each named top-level window, via xwininfo."""
+    try:
+        out = subprocess.run(["xwininfo", "-root", "-tree"], env={**os.environ, "DISPLAY": display},
+                             capture_output=True, text=True, timeout=10).stdout
+    except (OSError, subprocess.TimeoutExpired):
+        return []
+    return [(int(m[1], 16), m[2], int(m[3])) for m in re.finditer(r'(0x[0-9a-f]+) "([^"]*)":.*?\)\s+(\d+)x\d+', out)]
+
+
+def frame_submits(appid):
+    """SteamVR's count of frames the app has submitted, or None if it isn't a scene app."""
+    try:
+        stats = json.loads(subprocess.run([VRCMD, "--stats"], capture_output=True, text=True, timeout=15).stdout)
+    except (OSError, ValueError, subprocess.TimeoutExpired):
+        return None
+    if not isinstance(stats, list):
+        return None
+    return next((s.get("frame_submits") for s in stats if isinstance(s, dict) and s.get("key") == f"steam.app.{appid}"), None)
+
+
+def wait(what, seconds, check, step=2):
+    end = time.time() + seconds
+    while time.time() < end:
+        v = check()
+        if v is not None and v is not False:  # 0 frames is still an answer
+            return v
+        time.sleep(step)
+    raise Fail(f"timed out waiting for {what}")
+
+
+def start(appid):
+    g = game(appid)
+    r = read_receipt(appid)
+    if not r:
+        raise Fail(f"UEVR isn't installed for {g['name']}")
+    exe = r["exe"]
+    pid = game_pid(exe)
+    if pid and loaded(pid, "UEVRBackend.dll"):
+        return {"message": f"UEVR is already running in {g['name']}", "frame_submits": frame_submits(appid), **status(appid)}
+    if not pid:
+        subprocess.Popen(["steam", f"steam://rungameid/{appid}"], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
+                         env={**os.environ, "DISPLAY": os.environ.get("DISPLAY", ":0")}, start_new_session=True)
+        pid = wait(f"{g['name']} to start", 120, lambda: game_pid(exe))
+    try:
+        environ = Path(f"/proc/{pid}/environ").read_text(errors="replace")
+    except OSError:
+        raise Fail(f"{exe} exited") from None
+    game_env = dict(line.split("=", 1) for line in environ.split("\0") if GAME_ENV.match(line))
+    display = game_env.get("DISPLAY")
+    if not display or "WINEPREFIX" not in game_env:
+        raise Fail(f"{exe} doesn't look like a Proton game process")
+    # UEVR hooks the game's D3D11/12 device, so wait for its window. Proton's
+    # own helper windows ("Steam", "Default IME", …) are small.
+    wait("the game window", 90, lambda: any(w[2] >= 640 for w in x11_windows(display)))
+    time.sleep(10)
+    # Our own environment (HOME and the rest) under the game's Wine settings.
+    env = {**os.environ, **game_env}
+    base = f"C:\\{MANAGED}"
+    profile = f"C:\\users\\steamuser\\AppData\\Roaming\\UnrealVRMod\\{Path(exe).stem}"
+    try:
+        out = subprocess.run(["wine", f"{base}\\{PYTHON['dir']}\\python.exe", f"{base}\\{PYTHON['dir']}\\frame_inject.py",
+                              exe, f"{base}\\{UEVR['dir']}", profile], env=env, capture_output=True, text=True,
+                             timeout=120, stdin=subprocess.DEVNULL,
+                             cwd=str(Path(r["prefix"]) / "drive_c" / MANAGED))
+    except subprocess.TimeoutExpired:
+        raise Fail("the injection step didn't finish in 2 minutes") from None
+    reply = None
+    for line in reversed(out.stdout.splitlines()):
+        try:
+            reply = json.loads(line)
+            break
+        except ValueError:
+            continue
+    if not isinstance(reply, dict):
+        reply = None
+    if not reply or "error" in reply:
+        raise Fail("UEVR injection failed: " + (reply or {}).get("error", (out.stderr.strip().splitlines() or ["no output"])[-1]))
+    try:
+        wait("UEVRBackend.dll to load in the game", 20, lambda: loaded(pid, "UEVRBackend.dll"))
+    except Fail:
+        raise Fail(f"the injection reported success but {exe} has no UEVRBackend.dll") from None
+    submits = None
+    try:
+        submits = wait("SteamVR frames", 30, lambda: frame_submits(appid))
+    except Fail:
+        pass
+    return {"message": f"UEVR injected into {g['name']}" + ("; SteamVR is receiving its frames" if submits is not None
+                                                            else "; SteamVR hasn't reported frames from it yet"),
+            "frame_submits": submits, **status(appid)}
+
+
+def uninstall(appid):
+    r = read_receipt(appid)
+    if not r:
+        raise Fail(f"UEVR isn't installed for app {appid}")
+    if game_pid(r["exe"]):
+        raise Fail("the game is running; quit it first")
+    prefix = os.path.realpath(r["prefix"])
+    if not prefix.endswith(f"/steamapps/compatdata/{appid}/pfx"):
+        raise Fail(f"receipt names a prefix that isn't app {appid}'s: {r['prefix']}")
+    # Only ever our folder and UEVR's own settings folders for this game, even
+    # if the receipt says otherwise.
+    managed = os.path.join(prefix, "drive_c", MANAGED)
+    uevr_dirs = {os.path.realpath(str(d)) for d in user_dirs({"prefix": Path(prefix)}, Path(r["exe"])).values()}
+    targets = list(r.get("remove", [])) + list(r.get("remove_if_created", {}).values())
+    for t in targets:
+        real = os.path.realpath(t)
+        if not (real.startswith(managed + os.sep) or real in uevr_dirs):
+            raise Fail(f"receipt lists a path Frame Control didn't create: {t}")
+    for t in targets:
+        shutil.rmtree(t, ignore_errors=True)
+    left = [t for t in targets if os.path.lexists(t)]
+    if left:  # keep the receipt, so Remove can be tried again
+        raise Fail("couldn't remove " + ", ".join(left))
+    parents = {os.path.realpath(os.path.join(prefix, "drive_c/users/steamuser/AppData/Roaming/UnrealVRMod")), managed}
+    for t in r.get("remove_if_empty", []):
+        if os.path.realpath(t) in parents:
+            try:
+                os.rmdir(t)
+            except OSError:
+                pass  # something else lives there now
+    receipt_path(appid).unlink()
+    if not any(RECEIPTS.glob("*-uevr.json")):  # no other game uses the downloads
+        shutil.rmtree(CACHE, ignore_errors=True)
+        try:
+            RECEIPTS.rmdir()
+        except OSError:
+            pass
+    return {"message": "Removed UEVR", "appid": appid, "removed": targets}
+
+
+def main(argv):
+    if len(argv) != 2 or argv[0] not in ("status", "install", "start", "uninstall") or not argv[1].isdigit():
+        raise Fail("usage: status|install|start|uninstall APPID")
+    action = {"status": status, "install": install, "start": start, "uninstall": uninstall}[argv[0]]
+    if action is status:
+        return status(int(argv[1]))
+    import fcntl  # only on the Frame; the server and its tests also import this module on Windows
+    # One change at a time, or an uninstall could delete what an install is moving in.
+    LOCK.parent.mkdir(parents=True, exist_ok=True)
+    with open(LOCK, "w") as lock:
+        try:
+            fcntl.flock(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
+        except OSError:
+            raise Fail("another mod action is still running on the Frame; try again when it finishes") from None
+        return action(int(argv[1]))
+
+
+if __name__ == "__main__":
+    try:
+        print(json.dumps(main(sys.argv[1:])))
+    except Fail as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+    except Exception as e:  # still one JSON object, for the server to show
+        print(json.dumps({"error": f"{type(e).__name__}: {e}"}))
+        sys.exit(1)

ui/frame_touch.py

@@ -506,8 +506,10 @@ def apply(gs, event, panel):
         say("ready", focus=panel.get("window"), display=panel.get("display"), stale=True)  # the page re-syncs
         STALE[0] = True
         return panel
-    if STALE[0] and not stale:
+    release = event.get("down") is False and ("button" in event or "key" in event)
+    if STALE[0] and not stale and not (release and "window" not in event):
         # Anything that goes through (a trackpad move names no panel) means caught up: stop re-syncing.
+        # A bare release doesn't: the page leaves the panel off releases, so it says nothing about focus.
         STALE[0] = False
         say("ready", focus=(panel or {}).get("window"), display=(panel or {}).get("display"))
     if "fx" in event and panel and panel.get("window"):

ui/index.html

@@ -418,9 +418,9 @@
   .and-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 22px; align-items: start; }
   .and-col { display: grid; gap: 22px; align-content: start; }
   .rep-item .s { white-space: normal; }
-  #bugDlg, #repDlg, #titleDlg, #wiDlg, #pwDlg, #apkAltDlg, #aboutDlg { background: #1e2329; color: var(--text); border: 1px solid rgba(255,255,255,.1); border-radius: 4px;
+  #bugDlg, #repDlg, #titleDlg, #wiDlg, #pwDlg, #apkAltDlg, #aboutDlg, #modDlg { background: #1e2329; color: var(--text); border: 1px solid rgba(255,255,255,.1); border-radius: 4px;
             padding: 22px; width: min(560px, 92vw); box-shadow: 0 20px 60px rgba(0,0,0,.6); }
-  #bugDlg::backdrop, #repDlg::backdrop, #titleDlg::backdrop, #wiDlg::backdrop, #pwDlg::backdrop, #apkAltDlg::backdrop, #aboutDlg::backdrop { background: rgba(0,0,0,.55); }
+  #bugDlg::backdrop, #repDlg::backdrop, #titleDlg::backdrop, #wiDlg::backdrop, #pwDlg::backdrop, #apkAltDlg::backdrop, #aboutDlg::backdrop, #modDlg::backdrop { background: rgba(0,0,0,.55); }
   #bugDlg { width: min(640px, calc(100vw - 40px)); }
   #bugForm label.field { display: block; font-size: 12.5px; color: var(--muted); margin-top: 10px; }
   #bugForm label.field input, #bugForm label.field textarea, #bugForm select { margin-top: 5px; }
@@ -429,7 +429,7 @@
   #bugForm .popt { margin: 14px 0 0; }
   #bugForm .sentlog { max-height: 200px; }
   #bugWarn { color: var(--muted); font-size: 12.5px; line-height: 1.45; margin: 12px 0 0; }
-  #bugDlg h2, #repDlg h2, #titleDlg h2, #wiDlg h2, #pwDlg h2, #apkAltDlg h2, #aboutDlg h2 { margin: 0 0 14px; font-size: 15px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--bright); }
+  #bugDlg h2, #repDlg h2, #titleDlg h2, #wiDlg h2, #pwDlg h2, #apkAltDlg h2, #aboutDlg h2, #modDlg h2 { margin: 0 0 14px; font-size: 15px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--bright); }
   .about-text { max-height: 55vh; overflow: auto; }
   .about-text pre { white-space: pre-wrap; font-size: 12px; color: var(--muted); }
   .about-text summary { cursor: pointer; margin: 8px 0; }
@@ -600,8 +600,9 @@
   .store-chips { display:flex; flex-wrap:wrap; gap:7px; }
   .store-chips button { border-radius:20px; font-size:12px; height:34px; padding:0 14px; background:#ffffff07; color:#b5c0cb; border:1px solid #ffffff0c; }
   .store-chips button[aria-pressed=true] { background:#235779; border-color:#5287a5; color:white; }
-  .store-source-select select { max-width:180px; padding:8px 26px 8px 10px; font:inherit; font-size:12px; border:0; border-radius:5px; color:var(--text); background:#1d2b3b; }
   .store-notice { color:#a8b5c2; font-size:12px; margin:12px 0; }
+  .store-heading a, .cross-link a { color:var(--link); }
+  .cross-link { margin:-6px 0 12px; }
   body:has(.page.on #appStore:not([hidden])) #offline { padding:10px 16px; background:#ffffff06; box-shadow:inset 3px 0 0 var(--dim); }
   body:has(.page.on #appStore:not([hidden])) #offline .s { display:none; }
   .store-result-count { font-size:13px; color:var(--muted); margin-bottom:14px; }
@@ -609,14 +610,24 @@
   .store-hero { position:relative; display:block; width:100%; height:270px; border:0; padding:0; border-radius:12px; overflow:hidden; text-align:left; margin:0 0 32px; isolation:isolate; }
   .store-art { position:relative; display:block; overflow:hidden; background:radial-gradient(ellipse at 75% 10%, hsl(var(--hue) 50% 40%),transparent 70%),linear-gradient(140deg,hsl(var(--hue) 35% 18%),#101827); }
   .store-art > img { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; z-index:1; }
-  .art-initial { position:absolute; inset:0; display:flex; align-items:center; justify-content:center; font-size:70px; font-weight:700; color:#ffffff45; letter-spacing:-4px; }
+  .store-art > img.art-wash { inset:-24px; width:calc(100% + 48px); height:calc(100% + 48px); z-index:0; filter:blur(26px) saturate(1.4); opacity:.55; }
+  .store-art > img.art-icon { inset:0; margin:auto; width:64px; height:64px; border-radius:15px; z-index:0; box-shadow:0 10px 28px #0007; }
+  .detail-banner > img.art-icon, .store-hero .store-art > img.art-icon { width:88px; height:88px; border-radius:20px; }
+  .store-art .art-glyph { position:absolute; inset:0; display:grid; place-items:center; color:hsl(var(--hue) 45% 72% / .38); }
+  .store-art .art-glyph svg { width:34%; max-width:84px; height:auto; }
+  .runs { font-size:11px; font-weight:500; padding:3px 8px; border-radius:10px; white-space:nowrap; }
+  .runs.works { color:#c6efb0; background:#70bb5426; } .runs.ready { color:#b7d8ec; background:#6ec9ff1a; }
+  .runs.unknown { color:#a8b5c2; background:#ffffff0d; } .runs.blocked { color:#f1c28a; background:#d9a23a22; }
   .store-hero > .store-art { position:absolute; inset:0; }
   .store-hero::after { content:""; position:absolute; inset:0; background:linear-gradient(90deg,#081421ec 0%,#08142175 48%,#08142108 80%),linear-gradient(0deg,#08142170,transparent); z-index:2; }
   .hero-copy { position:relative; z-index:3; padding:30px; max-width:550px; display:flex; align-items:flex-start; flex-direction:column; gap:12px; }
   .hero-copy .store-eyebrow { color:#c2e7ff; }
   .hero-copy strong { color:white; font-size:38px; letter-spacing:-.8px; line-height:1.1; }
-  .hero-copy > span:not(.store-eyebrow):not(.hero-cta) { color:#e0e8ef; font-size:16px; font-weight:400; max-width:380px; line-height:1.6; }
-  .hero-cta { color:white; display:inline-flex; align-items:center; background:#ffffff20; border:1px solid #ffffff40; border-radius:6px; padding:10px 18px; font-size:13px; margin-top:6px; }
+  .hero-copy .hero-sum { color:#e0e8ef; font-size:16px; font-weight:400; max-width:380px; line-height:1.6; }
+  .hero-actions { display:flex; gap:10px; margin-top:6px; }
+  .hero-actions button { height:38px; border-radius:6px; padding:0 18px; }
+  .hero-details { background:#ffffff20; color:#fff; border:1px solid #ffffff40; }
+  .store-hero { cursor:pointer; }
   .store-row { margin-bottom:34px; }
   .store-row-head { display:flex; align-items:baseline; gap:12px; margin-bottom:14px; }
   .store-row-head h2 { text-transform:none; letter-spacing:-.3px; font-size:21px; font-weight:600; color:var(--bright); margin:0; }
@@ -632,10 +643,8 @@
   .store-card-title strong { font-size:15px; color:var(--bright); text-overflow:ellipsis; overflow:hidden; white-space:nowrap; }
   .store-summary { display:block; color:#a8b5c2; font-size:12px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
   .store-card-foot { display:flex; justify-content:space-between; align-items:center; gap:6px; margin-top:16px; font-size:11px; color:#a8b5c2; }
-  .store-card-foot b { color:#dbeecf; font-weight:500; }
   .store-badges { display:flex; flex-wrap:wrap; gap:7px; }
   .store-badge { font-size:11px; color:#b7d8ec; background:#6ec9ff14; padding:4px 9px; border-radius:5px; }
-  .store-badge.works { color:#b8e2ab; background:#70bb5418; }
   .store-empty { display:flex; flex-direction:column; align-items:center; text-align:center; padding:58px 20px 70px; }
   .store-empty svg { width:110px; height:90px; color:var(--link); margin-bottom:14px; }
   .store-empty h2 { font-size:23px; color:var(--bright); margin:8px 0; text-transform:none; letter-spacing:0; }
@@ -692,6 +701,7 @@
   .source-setting strong { display:block; font-size:14px; color:white; }
   .source-setting p { color:#a3b4c3; font-size:12px; margin:3px 0; }
   .source-setting small { color:var(--muted); font-size:10px; }
+  .source-web { font-size:12px; white-space:nowrap; }
   .source-toggle { appearance:none; width:38px; height:23px; flex:none; border-radius:15px; background:#465463; position:relative; cursor:pointer; margin:0; }
   .source-toggle::after { content:""; position:absolute; top:3px; left:3px; width:17px; height:17px; background:#fff; border-radius:50%; transition:transform .15s; }
   .source-toggle:checked { background:#208dca; }
@@ -717,7 +727,7 @@
     .store-chips { gap:5px; } .store-chips button { font-size:11px; padding:0 10px; }
     .store-hero { height:285px; border-radius:9px; margin-bottom:26px; }
     .hero-copy { padding:26px 22px; } .hero-copy strong { font-size:29px; }
-    .hero-copy > span:not(.store-eyebrow):not(.hero-cta) { font-size:13px; max-width:260px; }
+    .hero-copy .hero-sum { font-size:13px; max-width:260px; }
     .store-row-head { display:block; } .store-row-head h2 { font-size:18px; } .store-row-head p { margin-top:3px; }
     .store-card-content { padding:10px; } .store-card-title { gap:6px; } .store-card-title strong { font-size:13px; }
     .store-card-title .store-icon { width:25px; height:25px; font-size:12px; border-radius:6px; }
@@ -746,7 +756,7 @@
   <nav id="nav">
     <a href="#home" class="on" title="Headset view, status and screenshots (1)"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="2.5" y="7" width="19" height="10" rx="4"/><circle cx="8.5" cy="12" r="1.6"/><circle cx="15.5" cy="12" r="1.6"/></svg>Home<kbd>1</kbd></a>
     <a href="#games" title="Steam games and sideloaded titles (2)"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6 8h12a4 4 0 0 1 4 4v1a4 4 0 0 1-7 2.6h-6A4 4 0 0 1 2 13v-1a4 4 0 0 1 4-4z"/><path d="M7 11v3M5.5 12.5h3"/><circle cx="16" cy="11.5" r=".6"/><circle cx="18" cy="13.5" r=".6"/></svg>Games<kbd>2</kbd></a>
-    <a href="#android" title="Android apps and their display (3)"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="5" y="9" width="14" height="11" rx="2"/><path d="M8 9a4 4 0 0 1 8 0M8 5l1.5 2M16 5l-1.5 2M9.5 13h.01M14.5 13h.01"/></svg>Android<kbd>3</kbd></a>
+    <a href="#android" title="Android apps and VR games from outside Steam (3)"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="5" y="9" width="14" height="11" rx="2"/><path d="M8 9a4 4 0 0 1 8 0M8 5l1.5 2M16 5l-1.5 2M9.5 13h.01M14.5 13h.01"/></svg>Android<kbd>3</kbd></a>
     <a href="#tools" title="Files, clipboard, Linux apps, remote and power (4)"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M14.7 6.3a4 4 0 0 0-5.2 5.2L3.5 17.5a2.1 2.1 0 0 0 3 3l6-6a4 4 0 0 0 5.2-5.2l-2.5 2.5-2.5-2.5z"/></svg>Tools<kbd>4</kbd></a>
     <a href="#devices" class="desk-only" title="Headsets, their addresses and the connection (5)"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 12.5a10 10 0 0 1 14 0M8.5 16a5 5 0 0 1 7 0"/><circle cx="12" cy="19.5" r="1"/><path d="M2 9a15 15 0 0 1 20 0"/></svg>Devices<kbd>5</kbd></a>
     <a href="#control" title="Search controls, settings and live metrics (6)"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" aria-hidden="true"><path d="M3 6h18M3 12h18M3 18h18M8 3v6M16 9v6M10 15v6"/></svg>Control<kbd>6</kbd></a>
@@ -982,8 +992,7 @@
     <div class="shelf-head"><h2>Keyboard and trackpad</h2><span class="sub" id="padState"></span><span class="spacer"></span>
       <button class="small" id="padOn">Turn on</button>
     </div>
-    <p class="sub" id="padIntro">Use this computer's keyboard and mouse in apps on the Frame, such as Chromium or the
-      desktop's Linux apps.</p>
+    <p class="sub" id="padIntro">Use this computer's keyboard and mouse in the panel you're using in the headset.</p>
     <div id="padBody" hidden>
     <div class="pad-area" id="padArea" tabindex="0" role="application" aria-label="Trackpad for the Frame">
       <div class="pad-hint" id="padHint"></div>
@@ -1006,10 +1015,9 @@
         <button data-pad-key="12" title="Enter">Enter</button>
       </span>
     </div>
-    <div class="hint">Types and points in apps on the Frame, such as Chromium or the desktop's Linux apps; Steam's own VR menus
-      don't take it. It works through KDE Connect, which comes with Frame Control: the first time, it copies Valve's build
-      for the Frame (3.6 MB, 18 MB unpacked) into your home folder there and pairs with it. No internet needed, and nothing
-      else to install. <a href="#" data-about>Licences</a></div>
+    <div class="hint">Types and points in whichever panel has focus in the headset, through Valve's own input path: nothing to
+      install and no internet needed. Accents and emoji go through KDE Connect, which comes with Frame Control and starts
+      the first time you type one (it copies Valve's build for the Frame, 3.6 MB, into your home folder there). <a href="#" data-about>Licences</a></div>
     </div>
   </section>
 
@@ -1052,6 +1060,8 @@
   <section id="getgames">
     <div class="shelf-head"><h2>Get games</h2><span class="count" id="gmCount"></span><span class="spacer"></span>
       <span class="sub" id="gmDl"></span></div>
+    <p class="sub cross-link">Your Steam library and the Steam store. Free VR games and apps from outside Steam are on
+      <a href="#android">Android</a>.</p>
     <div class="panel">
       <div class="cat-tools">
         <div class="seg" id="gmSrc" aria-label="Where to look">
@@ -1074,11 +1084,11 @@
 
   <div class="page" data-page="android">
   <section id="android">
-    <div class="store-tabs" aria-label="Android sections"><button class="on" data-store-tab="browse" aria-pressed="true">Discover</button><button data-store-tab="library" aria-pressed="false">On your Frame <span id="andCount"></span></button><span class="spacer"></span><button id="sourcesOpen" class="small">Sources <span aria-hidden="true">⚙</span></button><button class="small" id="repNew" hidden>+ Report an APK</button></div>
+    <div class="store-tabs" aria-label="Android sections"><button class="on" data-store-tab="browse" aria-pressed="true">Discover</button><button data-store-tab="library" aria-pressed="false">On your Frame <span id="andCount"></span></button><span class="spacer"></span><button id="sourcesOpen" class="small" title="Choose where Discover looks for apps">Sources…</button><button class="small" id="repNew" hidden>+ Report an APK</button></div>
     <section id="appStore" aria-label="Discover apps">
-      <div class="store-toolbar"><div class="store-heading"><div><div class="store-eyebrow">A little more possibility</div><h1>Find your next favorite.</h1><p>Great games and useful apps. All in one place, all free to explore.</p></div></div>
+      <div class="store-toolbar"><div class="store-heading"><div><h1>Apps and games for the Frame</h1><p>Free Android apps and VR games from open app stores and developers' own pages, each marked with whether it runs on the Frame. Steam games are in <a href="#games">Games</a>.</p></div></div>
       <form id="sourceSearch" class="store-search"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" aria-hidden="true"><circle cx="10.5" cy="10.5" r="6.5"/><path d="m16 16 5 5"/></svg><input id="sourceQ" type="search" aria-label="Search games and apps" placeholder="Search games and apps"><button type="submit" class="small">Search</button></form></div>
-      <div class="store-filters"><div id="searchFilters" class="store-chips"><button data-filter="all" aria-pressed="true">For you</button><button data-filter="vr" aria-pressed="false">VR experiences</button><button data-filter="flat" aria-pressed="false">Flat-screen apps</button><button data-filter="installable" aria-pressed="false">Fits your Frame</button></div><label class="store-source-select"><span class="sr-only">Filter by source</span><select id="sourceFilter"><option value="">All sources</option></select></label></div>
+      <div class="store-filters"><div id="searchFilters" class="store-chips"><button data-filter="all" aria-pressed="true">All</button><button data-filter="vr" aria-pressed="false">VR</button><button data-filter="flat" aria-pressed="false">Flat-screen</button><button data-filter="installable" aria-pressed="false">Installs on the Frame</button></div></div>
       <div id="sourceStatus" class="store-notice" role="status" aria-live="polite" hidden></div>
       <div id="searchCount" class="store-result-count" aria-live="polite"></div>
       <div id="searchGrid" aria-busy="false"></div>
@@ -1416,9 +1426,9 @@
 </dialog>
 <dialog id="sourcesDialog" class="store-dialog sources-dialog" aria-labelledby="sourcesTitle">
   <button class="store-close" data-close="sourcesDialog" aria-label="Close source settings">×</button>
-  <div class="sources-intro"><div class="store-eyebrow">Your app shelves</div><h1 id="sourcesTitle">A world of apps.</h1><p>Choose where you discover games and apps. We bring them together for you.</p></div>
+  <div class="sources-intro"><h1 id="sourcesTitle">Sources</h1><p>Where Discover looks for apps. Turn a source off to hide its apps.</p></div>
   <div id="sourcesList"></div>
-  <form id="addSource" class="source-repo-form"><h2>Add a source</h2><p>Have a favorite F-Droid repository? Add its address to browse its apps here.</p><label>Repository address<input name="url" type="url" required placeholder="https://example.org/fdroid/repo"></label><details><summary>Verify this source (optional)</summary><label>Repository fingerprint<input name="fingerprint" type="text" autocomplete="off" placeholder="Paste the fingerprint from the repository owner"></label></details><details><summary>This repository needs a login (optional)</summary><label>Username<input name="username" type="text" autocomplete="off" autocapitalize="none" spellcheck="false"></label><label>Password<input name="password" type="password" autocomplete="new-password"></label><p>Kept on this computer, apart from the address, and only sent to this repository over HTTPS.</p></details><button class="action">Add source</button></form>
+  <form id="addSource" class="source-repo-form"><h2>Add a source</h2><p>Add an F-Droid repository by its address to browse its apps here.</p><label>Repository address<input name="url" type="url" required placeholder="https://example.org/fdroid/repo"></label><details><summary>Verify this source (optional)</summary><label>Repository fingerprint<input name="fingerprint" type="text" autocomplete="off" placeholder="Paste the fingerprint from the repository owner"></label></details><details><summary>This repository needs a login (optional)</summary><label>Username<input name="username" type="text" autocomplete="off" autocapitalize="none" spellcheck="false"></label><label>Password<input name="password" type="password" autocomplete="new-password"></label><p>Kept on this computer, apart from the address, and only sent to this repository over HTTPS.</p></details><button class="action">Add source</button></form>
   <p id="sourceError" class="store-notice" role="status" aria-live="polite"></p>
 </dialog>
 
@@ -1432,6 +1442,21 @@
   <div class="actions"><button id="apkAltClose">Close</button></div>
 </dialog>
 
+<dialog id="modDlg" aria-labelledby="modTitle">
+  <h2 id="modTitle">Play in VR with UEVR</h2>
+  <p id="modState" class="sub"></p>
+  <p class="sub">UEVR by praydog turns many Unreal Engine games into VR games. Frame Control downloads
+    the official UEVR 1.05 release and python.org's Windows Python, which it uses to load UEVR into the game
+    (about 20 MB), checks their hashes, and keeps them in this game's Proton prefix, not the game's folder.
+    Remove takes them out again.</p>
+  <p class="sub">Tested on the Frame with one game so far. Whether a game looks and plays right in VR varies;
+    UEVR's own menu in the headset has the per-game settings.</p>
+  <div class="row rep-actions"><span class="sub" id="modMsg"></span><span class="spacer"></span>
+    <button type="button" class="small" id="modClose">Close</button>
+    <button type="button" class="small" id="modRemove" hidden>Remove UEVR</button>
+    <button type="button" class="action small" id="modInstall" hidden>Install UEVR</button>
+    <button type="button" class="play small" id="modStart" hidden>▶ PLAY IN VR</button></div>
+</dialog>
 <dialog id="aboutDlg" aria-labelledby="aboutTitle">
   <h2 id="aboutTitle">About and licences</h2>
   <p>Frame Control is MIT-licensed. It ships other people's software, each under its own licence: the notices and
@@ -2179,7 +2204,7 @@ async function capture() {
   let url = null;
   try {
     let url_ = "/api/screenshot?view=headset";
-    var shotPanel = null;
+    let shotPanel = null;
     if (view === "flat") {
       shotPanel = deskPanel() || (await loadPanels(), deskPanel());
       if (!shotPanel) throw new Error(noPanelWhy());
@@ -3367,7 +3392,8 @@ function gameButtons(id, name, free) {
   const open = `<button class="small" data-gm="store" data-id="${id}" data-name="${esc(name)}" title="Open the store page in the headset">Store on Frame</button>`;
   if (d && d.appid === id) return `<span class="tag">${d.paused ? "Paused" : "Downloading"} ${d.percent ?? 0}%</span>`;
   if (g && g.installed) return `<span class="tag">Installed</span>` +
-    `<button class="play small" data-launch="${id}" data-name="${esc(name)}">▶ PLAY</button>`;
+    `<button class="play small" data-launch="${id}" data-name="${esc(name)}">▶ PLAY</button>` +
+    `<button class="small" data-mod="${id}" data-name="${esc(name)}" title="Flat-to-VR mod for Unreal Engine games">VR mod</button>`;
   if (g) return `<button class="action small" data-gm="install" data-id="${id}" data-name="${esc(name)}">Install on Frame</button>`;
   return `<a href="${storeUrl}" target="_blank" rel="noopener" title="Opens in your browser">${free ? "Get" : "Buy"} on Steam ↗</a>${open}`;
 }
@@ -3439,23 +3465,80 @@ document.body.addEventListener("click", async e => {
 });
 loadOwned();
 
+// ---- VR mod (UEVR) for one installed game; frame_mods.py does the work ----
+const mod = { appid: null, name: "" };
+function showMod(st, note) {
+  const busy = note === null;
+  $("modTitle").textContent = `${mod.name} in VR`;
+  $("modState").textContent = !st ? "Checking the game on the Frame…"
+    : !st.eligible ? "This doesn't look like an Unreal Engine game, so UEVR can't run it."
+    : !st.prefix ? "Play the game once first, so Steam sets up its Proton prefix."
+    : st.injected ? "UEVR is running in the game now. Put on the headset."
+    : st.installed ? `UEVR ${st.version} is installed for this game.${st.running ? " The game is running; Play in VR adds UEVR to it." : ""}`
+    : `UEVR ${st.version} isn't installed for this game yet.`;
+  $("modMsg").textContent = busy ? "Working… this can take a few minutes" : note || "";
+  const ok = st && st.eligible && st.prefix;
+  $("modInstall").hidden = !ok || st.installed; $("modStart").hidden = !ok || !st.installed || st.injected;
+  $("modRemove").hidden = !st || !st.installed;
+  for (const b of ["modInstall", "modStart", "modRemove"]) $(b).disabled = busy || (b === "modRemove" && st && st.running);
+}
+async function modAction(action, label) {
+  const appid = mod.appid;
+  showMod(mod.st, null);
+  const res = await act(`${label} for ${mod.name}`, () => api("/api/mods", { action, appid }));
+  if (appid !== mod.appid) return;
+  try { mod.st = await api("/api/mods", { action: "status", appid }); } catch {}
+  showMod(mod.st, res ? res.message : "Didn't work; the log has the reason");
+}
+document.body.addEventListener("click", async e => {
+  const b = e.target.closest("[data-mod]"); if (!b) return;
+  mod.appid = b.dataset.mod; mod.name = b.dataset.name; mod.st = null;
+  showMod(null, "");
+  $("modDlg").showModal();
+  const appid = mod.appid;
+  try { const st = await api("/api/mods", { action: "status", appid }); if (appid === mod.appid) { mod.st = st; showMod(st, ""); } }
+  catch (err) { if (appid === mod.appid) $("modState").textContent = err.message; }
+});
+$("modInstall").onclick = () => modAction("install", "Install UEVR");
+$("modStart").onclick = () => modAction("start", "Start UEVR");
+$("modRemove").onclick = () => modAction("uninstall", "Remove UEVR");
+$("modClose").onclick = () => $("modDlg").close();
+
 // ---- Discover apps ----
-const sourceState = { vr: null, installable: false, source: "", apps: [], sources: [], request: 0, detail: null, detailRequest: 0, jobs: new Map() };
+const sourceState = { vr: null, installable: false, apps: [], sources: [], request: 0, detail: null, detailRequest: 0, jobs: new Map() };
 const storeName = s => String(s || "").replace(/ \(demo\)$/i, "");
 const storeHue = name => [...String(name)].reduce((n, c) => (n * 31 + c.charCodeAt(0)) >>> 0, 7) % 360;
-const storeInitial = name => [...String(name || "?")][0].toUpperCase();
+const storeInitial = name => [...String(name || "?")][0].toUpperCase();  // the small icon's stand-in
 const storeText = text => String(text || "").replace(/<[^>]*>/g, " ").replace(/&nbsp;/g, " ");
 const storeOpenSource = o => o.open_source === true || /^(MIT|Apache|[AL]?GPL|BSD|MPL|ISC|CC0|Unlicense)/i.test(o.license || "");
 function sourcePage(url) { try { const u = new URL(url); return ["https:", "http:"].includes(u.protocol) ? u.href : ""; } catch { return ""; } }
 function storeImage(path, alt, eager=false) { return /^\/source-image\/[\w-]+$/.test(path || "") ? `<img src="${esc(path)}" alt="${esc(alt)}" loading="${eager ? "eager" : "lazy"}" decoding="async">` : ""; }
+// Artwork: the banner or first screenshot. Under it (and instead of it, when there's none, or it
+// doesn't load) the app's icon on a blurred wash of itself, or failing that a VR or app glyph.
+const GLYPH_VR = `<svg viewBox="0 0 48 48" fill="none" stroke="currentColor" stroke-width="2.4" aria-hidden="true"><rect x="5" y="15" width="38" height="20" rx="8"/><circle cx="17" cy="25" r="3.5"/><circle cx="31" cy="25" r="3.5"/></svg>`;
+const GLYPH_APP = `<svg viewBox="0 0 48 48" fill="none" stroke="currentColor" stroke-width="2.4" aria-hidden="true"><rect x="8" y="8" width="13" height="13" rx="3.5"/><rect x="27" y="8" width="13" height="13" rx="3.5"/><rect x="8" y="27" width="13" height="13" rx="3.5"/><rect x="27" y="27" width="13" height="13" rx="3.5"/></svg>`;
 function storeArt(o, cls="", eager=false, path=null, alt=null) {
   const image = path || o.artwork?.banner || o.artwork?.screenshots?.[0];
-  return `<span class="store-art ${cls}" style="--hue:${storeHue(o.name)}"><span class="art-initial" aria-hidden="true">${esc(storeInitial(o.name))}</span>${storeImage(image, alt || `${o.name} artwork`, eager)}</span>`;
+  const icon = !path && /^\/source-image\/[\w-]+$/.test(o.artwork?.icon || "") ? o.artwork.icon : "";
+  const under = path ? "" : icon
+    ? `<img class="art-wash" src="${esc(icon)}" alt="" loading="lazy" decoding="async"><img class="art-icon" src="${esc(icon)}" alt="" loading="lazy" decoding="async">`
+    : `<span class="art-glyph">${o.vr ? GLYPH_VR : GLYPH_APP}</span>`;
+  return `<span class="store-art ${cls}${image ? "" : " no-image"}" style="--hue:${storeHue(o.name)}">${under}${storeImage(image, alt || `${o.name} artwork`, eager)}</span>`;
 }
 function storeIcon(o) { return `<span class="store-icon" style="--hue:${storeHue(o.name)}" aria-hidden="true">${esc(storeInitial(o.name))}${storeImage(o.artwork?.icon, "")}</span>`; }
-document.addEventListener("error", e => { if (e.target.matches?.(".store-art img, .store-icon img")) e.target.remove(); }, true);
+document.addEventListener("error", e => {
+  if (!e.target.matches?.(".store-art img, .store-icon img")) return;
+  const art = e.target.closest(".store-art");
+  e.target.remove();
+  // Nothing left to show: the glyph rather than an empty wash.
+  if (art && !art.querySelector("img") && !art.querySelector(".art-glyph")) art.insertAdjacentHTML("afterbegin", `<span class="art-glyph">${GLYPH_APP}</span>`);
+}, true);
 function sourceMark(s) { const name=storeName(s); return `<span class="offer-mark" style="--hue:${storeHue(name)}" aria-hidden="true">${esc(name === "SideQuest" ? "SQ" : name === "F-Droid" ? "Fd" : name.slice(0,2))}</span>`; }
-function sourceDescription(s) { return s.description || ({fdroid:"Independent, open-source apps",sidequest:"Discover something new in VR",itch:"Games from independent creators",github:"Direct from the people who make it"})[s.kind] || (s.name.includes("GitHub") ? "Direct from the people who make it" : s.name.includes("Droid") ? "Independent, open-source apps" : s.name.includes("SideQuest") ? "Discover something new in VR" : s.name.includes("itch") ? "Games from independent creators" : "Apps shared by this community"); }
+function sourceDescription(s) {
+  const kinds = {fdroid:"Free and open-source Android apps", itch:"Games from independent developers", github:"Releases straight from the developers",
+                 sidequest:"VR games and apps. Its terms don't allow searching it from here, so browse it on its website."};
+  return s.description || kinds[s.kind] || "Apps from this repository";
+}
 // GitHub's optional access token: only whether one is set is ever shown, never its value.
 function sourceToken(s) {
   const t=s.token;if(!t)return "";
@@ -3465,37 +3548,53 @@ function sourceToken(s) {
 async function loadSources() {
   try {
     const {sources} = await api("/api/sources"); sourceState.sources = sources;
-    $("sourceFilter").innerHTML = `<option value="">All sources</option>` + sources.filter(s=>s.enabled).map(s=>`<option value="${esc(s.id)}">${esc(storeName(s.name))}</option>`).join("");
-    $("sourceFilter").value = sourceState.source;
-    $("sourcesList").innerHTML = sources.map(s=>`<div class="source-setting">${sourceMark(s.name)}<div class="grow"><strong>${esc(storeName(s.name))}</strong><p>${esc(sourceDescription(s))}</p><small>${esc(({official:"Official store",community:"Community",user:"Added by you"})[s.trust] || "Community")}${s.login ? " · Uses a login" : ""}</small>${sourceToken(s)}${s.builtin === false ? `<button class="small" data-remove="${esc(s.id)}" aria-label="Remove ${esc(s.name)}">Remove</button>` : ""}</div><input class="source-toggle" role="switch" type="checkbox" aria-label="Enable ${esc(storeName(s.name))}" data-enable="${esc(s.id)}" ${s.enabled ? "checked" : ""}></div>`).join("") || `<p class="store-notice">Your sources will appear here when they are available.</p>`;
+    $("sourcesList").innerHTML = sources.map(s=>`<div class="source-setting">${sourceMark(s.name)}<div class="grow"><strong>${esc(storeName(s.name))}</strong><p>${esc(sourceDescription(s))}</p><small>${esc(({official:"Official store",community:"Community",user:"Added by you"})[s.trust] || "Community")}${s.login ? " · Uses a login" : ""}</small>${sourceToken(s)}${s.builtin === false ? `<button class="small" data-remove="${esc(s.id)}" aria-label="Remove ${esc(s.name)}">Remove</button>` : ""}</div>${s.page_only ? `<a class="source-web" href="${esc(sourcePage(s.url))}" target="_blank" rel="noopener" title="Its apps can't be searched from here">Website ↗</a>` : `<input class="source-toggle" role="switch" type="checkbox" aria-label="Enable ${esc(storeName(s.name))}" data-enable="${esc(s.id)}" ${s.enabled ? "checked" : ""}>`}</div>`).join("") || `<p class="store-notice">Your sources will appear here when they are available.</p>`;
   } catch (e) { $("sourceError").textContent = e.message; }
 }
+// Will it run? Short enough for a card; the full sentence is in its tooltip and the details.
+const RUNS = { works: ["✓ Works on the Frame", "works"], ready: ["Should install", "ready"], unknown: ["Not checked yet", "unknown"], blocked: ["May not run", "blocked"] };
+function storeRuns(o) {
+  const [text, cls] = RUNS[o.verdict?.tone] || RUNS.unknown;
+  return `<span class="runs ${cls}" title="${esc(o.verdict?.label || "Not yet checked on the Frame")}">${text}</span>`;
+}
+const storeKind = o => o.vr ? "VR" : o.vr === false ? "Flat-screen app" : "Android app";
 function storeCard(app) {
   const i=sourceState.apps.indexOf(app), o=app.offers[0];
-  return `<button class="store-card" data-app="${i}" aria-label="View ${esc(app.name)}">${storeArt(o)}<span class="store-card-content"><span class="store-card-title">${storeIcon(o)}<strong>${esc(app.name)}</strong></span><span class="store-summary">${esc(storeText(app.summary) || "A new addition to your Frame")}</span><span class="store-card-foot"><span>${o.vr ? "VR experience" : o.vr === false ? "Flat-screen app" : "Android app"}</span><b>Free</b></span></span></button>`;
+  return `<button class="store-card" data-app="${i}" aria-label="${esc(app.name)}: ${esc(o.verdict?.label || "not yet checked on the Frame")}">${storeArt(o)}<span class="store-card-content"><span class="store-card-title">${storeIcon(o)}<strong>${esc(app.name)}</strong></span><span class="store-summary">${esc(storeText(app.summary) || "From " + storeName(o.source_name))}</span><span class="store-card-foot"><span>${storeKind(o)}</span>${storeRuns(o)}</span></span></button>`;
 }
-function storeRow(title, subtitle, apps) { return apps.length ? `<section class="store-row"><div class="store-row-head"><h2>${esc(title)}</h2><p>${esc(subtitle)}</p></div><div class="store-grid">${apps.slice(0,5).map(storeCard).join("")}</div></section>` : ""; }
-function storeEmpty() {
-  return `<div class="store-empty"><svg viewBox="0 0 120 100" fill="none" aria-hidden="true"><rect x="18" y="25" width="60" height="55" rx="12" fill="currentColor" opacity=".08"/><rect x="29" y="18" width="60" height="55" rx="12" stroke="currentColor" opacity=".35"/><circle cx="61" cy="43" r="15" stroke="currentColor" stroke-width="3"/><path d="m72 55 17 18M17 12v10m-5-5h10m79-4v10m-5-5h10" stroke="currentColor" stroke-width="3" stroke-linecap="round"/></svg><h2>A little further to explore.</h2><p>No apps found this time. Try a different name, clear your filters, or explore another source.</p><button class="action" id="storeReset">Explore all apps</button></div>`;
+function storeRow(title, subtitle, apps) { return apps.length ? `<section class="store-row"><div class="store-row-head"><h2>${esc(title)}</h2>${subtitle ? `<p>${esc(subtitle)}</p>` : ""}</div><div class="store-grid">${apps.slice(0,5).map(storeCard).join("")}</div></section>` : ""; }
+function storeEmpty(message) {
+  return `<div class="store-empty"><svg viewBox="0 0 120 100" fill="none" aria-hidden="true"><rect x="18" y="25" width="60" height="55" rx="12" fill="currentColor" opacity=".08"/><rect x="29" y="18" width="60" height="55" rx="12" stroke="currentColor" opacity=".35"/><circle cx="61" cy="43" r="15" stroke="currentColor" stroke-width="3"/><path d="m72 55 17 18M17 12v10m-5-5h10m79-4v10m-5-5h10" stroke="currentColor" stroke-width="3" stroke-linecap="round"/></svg><h2>${message ? "Couldn't load apps" : "No apps found"}</h2><p>${message ? esc(message) : "Try another name, or clear the filters."}</p><button class="action" id="storeReset">${message ? "Try again" : "Clear filters"}</button></div>`;
 }
 function renderStore() {
-  const apps=sourceState.apps, browsing=!$("sourceQ").value.trim() && sourceState.vr === null && !sourceState.installable && !sourceState.source;
+  const apps=sourceState.apps, browsing=!$("sourceQ").value.trim() && sourceState.vr === null && !sourceState.installable;
   $("searchCount").textContent = browsing ? "" : `${apps.length} ${apps.length===1 ? "app" : "apps"}${$("sourceQ").value.trim() ? ` for “${$("sourceQ").value.trim()}”` : ""}`;
   if (!apps.length) { $("searchGrid").innerHTML=storeEmpty(); return; }
   if (!browsing) { $("searchGrid").innerHTML=`<div class="store-grid">${apps.map(storeCard).join("")}</div>`; return; }
-  const featured=apps.find(a=>a.offers[0].vr && a.offers[0].artwork?.banner && a.offers[0].verdict?.tone !== 'blocked') || apps.find(a=>a.offers[0].artwork?.banner) || apps[0], o=featured.offers[0];
-  const tested=apps.filter(a=>a.offers.some(o=>o.vr && o.verdict?.tone==='works'));
-  const vr=tested.length ? tested : apps.filter(a=>a.offers.some(o=>o.vr && o.verdict?.tone !== 'blocked'));
-  const popular=[...apps].sort((a,b)=>(b.offers[0].popularity||0)-(a.offers[0].popularity||0));
-  const recent=apps.filter(a=>a.offers.some(o=>o.updated)).sort((a,b)=>String(b.offers[0].updated||'').localeCompare(String(a.offers[0].updated||'')));
-  $("searchGrid").innerHTML=`<button class="store-hero" data-app="${apps.indexOf(featured)}" aria-label="Explore ${esc(featured.name)}">${storeArt(o,"",true)}<span class="hero-copy"><span class="store-eyebrow">Step into something new</span><strong>${esc(featured.name)}</strong><span>${esc(storeText(featured.summary))}</span><span class="hero-cta">Explore ${esc(featured.name)} <span aria-hidden="true">&nbsp; ↗</span></span></span></button>` + storeRow(apps.some(a=>a.offers[0].popularity) ? "Popular apps" : "Explore apps","More ways to make your Frame yours",popular) + storeRow(tested.length ? "VR that works on the Frame" : "Step into VR",tested.length ? "Experiences checked on a Frame" : "A new perspective, a whole new playground",vr) + storeRow("Recently updated","Fresh from their creators",recent);
+  // The featured app: something that runs, with real artwork, and preferably VR. It isn't repeated below.
+  const runs=a=>a.offers[0].verdict?.tone!=='blocked', art=a=>a.offers[0].artwork?.banner;
+  const featured=apps.find(a=>a.offers[0].vr && art(a) && runs(a)) || apps.find(a=>art(a) && runs(a)) || apps.find(runs) || apps[0], o=featured.offers[0];
+  const rest=apps.filter(a=>a!==featured);
+  const tested=rest.filter(a=>a.offers.some(o=>o.vr && o.verdict?.tone==='works'));
+  const vr=tested.length ? tested : rest.filter(a=>a.offers.some(o=>o.vr && o.verdict?.tone !== 'blocked'));
+  // Rows don't repeat each other either: each takes the next apps not shown yet.
+  const shown=new Set(), take=list=>{ const out=list.filter(a=>!shown.has(a)).slice(0,5); out.forEach(a=>shown.add(a)); return out; };
+  const vrRow=take(vr);
+  const likely={works:0,ready:1,unknown:2,blocked:3}, rank=a=>likely[a.offers[0].verdict?.tone] ?? 2;
+  const popular=take([...rest].sort((a,b)=>rank(a)-rank(b) || (b.offers[0].popularity||0)-(a.offers[0].popularity||0)));
+  const recent=take(rest.filter(a=>a.offers.some(o=>o.updated)).sort((a,b)=>String(b.offers[0].updated||'').localeCompare(String(a.offers[0].updated||''))));
+  const canInstall=o.downloadable && runs(featured);
+  $("searchGrid").innerHTML=`<div class="store-hero" data-app="${apps.indexOf(featured)}">${storeArt(o,"",true)}<div class="hero-copy"><span class="store-eyebrow">Featured${o.vr ? " in VR" : ""}</span><strong>${esc(featured.name)}</strong><span class="hero-sum">${esc(storeText(featured.summary))}</span><span class="hero-runs">${storeRuns(o)}</span><span class="hero-actions">${canInstall ? `<button class="action" data-hero-install="${apps.indexOf(featured)}">Install on the Frame</button>` : ""}<button class="hero-details" data-app="${apps.indexOf(featured)}">Details</button></span></div></div>` +
+    storeRow(tested.length ? "VR that works on the Frame" : "VR games and experiences", tested.length ? "Checked on a Frame" : "Made for headsets; most aren't checked on the Frame yet", vrRow) +
+    storeRow(apps.some(a=>a.offers[0].popularity) ? "Popular" : "More to try", "", popular) +
+    storeRow("Recently updated", "New versions from their developers", recent);
 }
 function storeChips() { $("searchFilters").querySelectorAll("button").forEach(b=>b.setAttribute("aria-pressed",b.dataset.filter==='all' ? sourceState.vr===null && !sourceState.installable : b.dataset.filter==='installable' ? sourceState.installable : sourceState.vr===(b.dataset.filter==='vr'))); }
 async function searchSources(quiet) {
   const request=++sourceState.request;
   $("searchGrid").setAttribute("aria-busy","true");
   if(!quiet)$("searchGrid").innerHTML=`<div class="store-grid" role="status" aria-label="Finding apps">${Array.from({length:8},()=>'<div class="store-skeleton" aria-hidden="true"></div>').join("")}</div>`;
-  const params=new URLSearchParams({q:$("sourceQ").value,source:sourceState.source,installable:String(sourceState.installable)});
+  const params=new URLSearchParams({q:$("sourceQ").value,installable:String(sourceState.installable)});
   if(sourceState.vr!==null)params.set("vr",String(sourceState.vr));
   try {
     const result=await api("/api/search?"+params);if(request!==sourceState.request)return;
@@ -3508,16 +3607,16 @@ async function searchSources(quiet) {
     result.sources.filter(s=>s.status==='limited').forEach(s=>notes.push(`${s.error}.`));
     const stale=result.sources.filter(s=>s.stale).map(s=>storeName(s.name));
     if(stale.length)notes.push(`Showing saved listings from ${stale.join(" and ")} while ${stale.length===1 ? "it refreshes" : "they refresh"}.`);
-    $("sourceStatus").innerHTML=notes.map(esc).join(" ")+(result.elsewhere||[]).map(x=>` <a href="${esc(x.url)}" target="_blank" rel="noopener">Browse ${esc(storeName(x.name))} ↗</a>`).join("");
-    $("sourceStatus").hidden=!notes.length && !(result.elsewhere||[]).length;
+    $("sourceStatus").textContent=notes.join(" ");
+    $("sourceStatus").hidden=!notes.length;
     clearTimeout(sourceState.retry);
     if(loading.length)sourceState.retry=setTimeout(()=>{ if(request===sourceState.request)searchSources(true); },6000);
     renderStore();await loadSources();
-  } catch(e) { if(request===sourceState.request) { $("searchGrid").innerHTML=storeEmpty();$("sourceStatus").hidden=false;$("sourceStatus").textContent="We couldn't reach the app shelves. Try again in a moment."; } }
+  } catch(e) { if(request===sourceState.request) { $("searchGrid").innerHTML=storeEmpty("Couldn't reach the app sources. Try again in a moment.");$("sourceStatus").hidden=true; } }
   finally { if(request===sourceState.request)$("searchGrid").setAttribute("aria-busy","false"); }
 }
 function currentOffer() { return sourceState.detail?.app.offers[sourceState.detail.choice]; }
-function detailBadges(o) { return `<span class="store-badge">${o.vr ? "VR experience" : o.vr===false ? "Flat-screen app" : "Android app"}</span>${o.verdict?.tone==='works' ? '<span class="store-badge works">✓ Works on Frame</span>' : ''}<span class="store-badge">Free</span>${storeOpenSource(o) ? '<span class="store-badge">Open source</span>' : ''}`; }
+function detailBadges(o) { return `<span class="store-badge">${storeKind(o)}</span>${storeRuns(o)}<span class="store-badge">Free</span>${storeOpenSource(o) ? '<span class="store-badge">Open source</span>' : ''}`; }
 // The store's app page. (Not renderDetail: the Devices page declares that further down,
 // and a later function declaration silently replaces an earlier one; issue #68.)
 // True when the page rendered; false when it shows the error instead.
@@ -3533,7 +3632,7 @@ function renderAppDetail() {
 function renderAppDetailBody() {
   const restoreOfferFocus=document.activeElement?.name==='storeOffer';
   const d=sourceState.detail;if(!d)return;const o=currentOffer(), images=o.artwork?.screenshots||[], page=sourcePage(o.page);
-  $("detailBody").innerHTML=storeArt(o,"detail-banner",true)+`<div class="detail-content"><div class="detail-heading">${storeIcon(o)}<div><h1 id="detailTitle">${esc(o.name)}</h1><p>${esc(o.developer || o.author || 'From '+storeName(o.source_name))}</p></div></div><div class="store-badges">${detailBadges(o)}</div><div class="detail-layout"><div><div class="detail-gallery" id="detailGallery" aria-label="App screenshots" tabindex="0">${images.map((p,i)=>storeArt(o,"",false,p,`${o.name} screenshot ${i+1}`)).join("")}</div>${images.length ? `<div class="gallery-controls"><span>${images.length} screenshots · scroll to explore</span><div><button data-gallery="-1" aria-label="Previous screenshot">←</button> <button data-gallery="1" aria-label="Next screenshot">→</button></div></div>` : ''}<h2>About this app</h2><div class="detail-description">${esc(storeText(o.description || o.summary || "Discover this app on its developer's page."))}</div>${page ? `<p><a href="${esc(page)}" target="_blank" rel="noopener noreferrer">Meet the creators ↗</a></p>` : ''}<details class="detail-technical"><summary>Technical details</summary><dl><dt>Package</dt><dd>${esc(o.package||"Unknown")}</dd><dt>Version</dt><dd>${esc(o.version||"Unknown")} (${esc(o.version_code??"unknown")})</dd><dt>Android API</dt><dd>${esc(o.min_sdk??"Unknown")}</dd><dt>Architecture</dt><dd>${esc(o.abis?.join(', ')||"Unknown / no native code")}</dd><dt>Updated</dt><dd>${esc(o.updated||"Unknown")}</dd><dt>Compatibility</dt><dd>${(o.fit?.reasons||[]).map(esc).join(' · ')||'No known installation blockers'}</dd></dl></details></div><aside class="detail-buy"><div class="detail-price">Free</div><p class="detail-small">No purchase needed.</p><p class="detail-verdict ${esc(o.verdict?.tone||'unknown')}">${esc(o.verdict?.label||'Not yet checked on the Frame')}</p><button id="detailInstall" class="action store-primary">Install</button><progress id="detailProgress" max="100" hidden aria-label="Installation progress"></progress><p id="detailInstallNote" class="detail-small" role="status" aria-live="polite"></p><h2>Get it from</h2><div id="detailOffers">${d.app.offers.map((v,j)=>`<label class="offer-choice"><input type="radio" name="storeOffer" value="${j}" ${j===d.choice?'checked':''}><span>${sourceMark(v.source_name)}</span><span><strong>${esc(storeName(v.source_name))}${j===0?' · Recommended':''}</strong><small>${v.verified===true?'✓ Verified download':'Verification not provided'}</small><small>${esc(v.version ? 'v'+v.version : 'Latest release')}${v.size!=null?' · '+(v.size/1048576).toFixed(0)+' MB':''}</small></span></label>`).join('')}</div></aside></div></div>`;
+  $("detailBody").innerHTML=storeArt(o,"detail-banner",true)+`<div class="detail-content"><div class="detail-heading">${storeIcon(o)}<div><h1 id="detailTitle">${esc(o.name)}</h1><p>${esc(o.developer || o.author || 'From '+storeName(o.source_name))}</p></div></div><div class="store-badges">${detailBadges(o)}</div><div class="detail-layout"><div><div class="detail-gallery" id="detailGallery" aria-label="App screenshots" tabindex="0">${images.map((p,i)=>storeArt(o,"",false,p,`${o.name} screenshot ${i+1}`)).join("")}</div>${images.length ? `<div class="gallery-controls"><span>${images.length} screenshots · scroll to explore</span><div><button data-gallery="-1" aria-label="Previous screenshot">←</button> <button data-gallery="1" aria-label="Next screenshot">→</button></div></div>` : ''}<h2>About this app</h2><div class="detail-description">${esc(storeText(o.description || o.summary || "Discover this app on its developer's page."))}</div>${page ? `<p><a href="${esc(page)}" target="_blank" rel="noopener noreferrer">The developer's page ↗</a></p>` : ''}<details class="detail-technical"><summary>Technical details</summary><dl><dt>Package</dt><dd>${esc(o.package||"Unknown")}</dd><dt>Version</dt><dd>${esc(o.version||"Unknown")} (${esc(o.version_code??"unknown")})</dd><dt>Android API</dt><dd>${esc(o.min_sdk??"Unknown")}</dd><dt>Architecture</dt><dd>${esc(o.abis?.join(', ')||"Unknown / no native code")}</dd><dt>Updated</dt><dd>${esc(o.updated||"Unknown")}</dd><dt>Compatibility</dt><dd>${(o.fit?.reasons||[]).map(esc).join(' · ')||'No known installation blockers'}</dd></dl></details></div><aside class="detail-buy"><div class="detail-price">Free</div><p class="detail-small">No purchase needed.</p><p class="detail-verdict ${esc(o.verdict?.tone||'unknown')}">${esc(o.verdict?.label||'Not yet checked on the Frame')}</p><button id="detailInstall" class="action store-primary">Install</button><progress id="detailProgress" max="100" hidden aria-label="Installation progress"></progress><p id="detailInstallNote" class="detail-small" role="status" aria-live="polite"></p><h2>Get it from</h2><div id="detailOffers">${d.app.offers.map((v,j)=>`<label class="offer-choice"><input type="radio" name="storeOffer" value="${j}" ${j===d.choice?'checked':''}><span>${sourceMark(v.source_name)}</span><span><strong>${esc(storeName(v.source_name))}${j===0?' · Recommended':''}</strong><small>${v.verified===true?'✓ Verified download':'Verification not provided'}</small><small>${esc(v.version ? 'v'+v.version : 'Latest release')}${v.size!=null?' · '+(v.size/1048576).toFixed(0)+' MB':''}</small></span></label>`).join('')}</div></aside></div></div>`;
   updateInstall();
   if(restoreOfferFocus)document.querySelector('#detailOffers input:checked')?.focus();
 }
@@ -3541,17 +3640,23 @@ function updateInstall() {
   const o=currentOffer();if(!o || !$("detailInstall"))return;
   const job=sourceState.jobs.get(`${o.source}:${o.id}`), blocked=o.verdict?.tone==='blocked', page=sourcePage(o.page), b=$("detailInstall");
   b.disabled=!!(job && !job.done) || !!job?.addingData || (blocked && !job?.result) || (!o.downloadable && !page);
-  b.textContent=job?.result?.game_data ? (job.addingData ? 'Adding game data…' : 'Add game data') : job?.result ? 'Open in Steam' : job && !job.done ? (job.stage||'Downloading')+(job.percent!=null?` ${Math.round(job.percent)}%`:'…') : blocked ? 'Not compatible' : o.downloadable ? (job?.error?'Try again':'Install on Frame') : 'Get from the creator ↗';
+  b.textContent=job?.result?.game_data ? (job.addingData ? 'Adding game data…' : 'Add game data') : job?.result ? 'Open in Steam' : job && !job.done ? (job.stage||'Downloading')+(job.percent!=null?` ${Math.round(job.percent)}%`:'…') : blocked ? 'Not compatible' : o.downloadable ? (job?.error?'Try again':'Install on the Frame') : 'Get from the creator ↗';
   $("detailProgress").hidden=!job || job.done;
   if(job?.percent!=null)$("detailProgress").value=job.percent;else $("detailProgress").removeAttribute("value");
-  $("detailInstallNote").textContent=job?.result?.game_data ? (job.dataError || 'Installed. It also needs its game data: open it once on the Frame, then choose Add game data.') : job?.result ? '✓ Installed. Find it in your Steam library.' : job?.error || (job && !job.done ? 'Keep exploring. We’ll take care of the installation.' : o.verdict?.tone==='works' ? 'Adds to your Steam library.' : 'Compatibility can vary. Adds to your Steam library.');
+  $("detailInstallNote").textContent=job?.result?.game_data ? (job.dataError || 'Installed. It also needs its game data: open it once on the Frame, then choose Add game data.') : job?.result ? '✓ Installed. Find it in your Steam library.' : job?.error || (job && !job.done ? 'Installing. You can close this and keep browsing.' : o.verdict?.tone==='works' ? 'Adds to your Steam library.' : 'Compatibility can vary. Adds to your Steam library.');
   $("detailOffers").querySelectorAll('input').forEach(input=>input.disabled=!!job&&!job.done);
 }
-async function openStoreApp(index) {
+async function openStoreApp(index, install=false) {
   const app=sourceState.apps[index];if(!app)return;
   sourceState.detail={app:{...app,offers:app.offers.map(o=>({...o}))},choice:0};
   const shown=renderAppDetail();if(!$("appDetail").open)$("appDetail").showModal();$("appDetail").scrollTop=0;
-  if(shown)await loadOfferDetails();
+  if(shown) {
+    // The hero's Install starts in the details, which show its progress. A running or
+    // finished job only opens its details; a failed install can be tried again.
+    const o=currentOffer(), job=sourceState.jobs.get(`${o.source}:${o.id}`);
+    if(install&&(!job||job.done&&!job.result))installStoreApp();
+    await loadOfferDetails();
+  }
 }
 async function loadOfferDetails() {
   const d=sourceState.detail,o=currentOffer(), request=++sourceState.detailRequest;
@@ -3582,15 +3687,14 @@ async function installStoreApp() {
 }
 async function changeSource(body) {
   $("sourceError").textContent="Saving your sources…";
-  try { const result=await api('/api/sources',body);$("sourceError").textContent=result.message;sourceState.source='';await loadSources();await searchSources(); }
+  try { const result=await api('/api/sources',body);$("sourceError").textContent=result.message;await loadSources();await searchSources(); }
   catch(e) { $("sourceError").textContent=e.message;await loadSources(); }
 }
 let storeSearchTimer;
 $("sourceQ").oninput=()=>{clearTimeout(storeSearchTimer);storeSearchTimer=setTimeout(searchSources,300);};
 $("sourceSearch").onsubmit=e=>{e.preventDefault();clearTimeout(storeSearchTimer);searchSources();};
-$("sourceFilter").onchange=e=>{sourceState.source=e.target.value;searchSources();};
 $("searchFilters").onclick=e=>{const b=e.target.closest('[data-filter]');if(!b)return;const f=b.dataset.filter;if(f==='all'){sourceState.vr=null;sourceState.installable=false;}else if(f==='installable')sourceState.installable=!sourceState.installable;else sourceState.vr=sourceState.vr===(f==='vr')?null:f==='vr';storeChips();searchSources();};
-$("searchGrid").onclick=e=>{const b=e.target.closest('[data-app]');if(b)openStoreApp(+b.dataset.app);if(e.target.closest('#storeReset')){$('sourceQ').value='';sourceState.vr=null;sourceState.installable=false;sourceState.source='';storeChips();searchSources();}};
+$("searchGrid").onclick=e=>{const h=e.target.closest('[data-hero-install]');if(h){openStoreApp(+h.dataset.heroInstall,true);return;}const b=e.target.closest('[data-app]');if(b)openStoreApp(+b.dataset.app);if(e.target.closest('#storeReset')){$('sourceQ').value='';sourceState.vr=null;sourceState.installable=false;storeChips();searchSources();}};
 $("detailBody").onclick=e=>{if(e.target.closest('[data-close]'))return $("appDetail").close();if(e.target.closest('#detailInstall'))installStoreApp();const b=e.target.closest('[data-gallery]');if(b)$('detailGallery').scrollBy({left:+b.dataset.gallery*$('detailGallery').clientWidth*.86,behavior:matchMedia('(prefers-reduced-motion: reduce)').matches?'instant':'smooth'});};
 $("detailBody").onchange=e=>{if(e.target.name==='storeOffer'){sourceState.detail.choice=+e.target.value;renderAppDetail();loadOfferDetails();}};
 $("sourcesOpen").onclick=()=>{loadSources();$('sourcesDialog').showModal();};
@@ -3602,7 +3706,7 @@ async function addSource(body) {
   let error="";
   const result=await runJob('Add repository',`repo:${body.url}`,()=>api('/api/sources',body).catch(e=>{error=e.message;throw e;}),j=>{error=j.error||"";});
   $("sourceError").textContent=result ? result.message : error || "We couldn't add that repository.";
-  if(result){$("addSource").reset();sourceState.source='';await loadSources();await searchSources();}
+  if(result){$("addSource").reset();await loadSources();await searchSources();}
 }
 // A login typed into the address moves into the login fields, on the page too, before anything
 // is sent: the address is shown and logged, the login never. It stays there if adding fails.
@@ -4529,10 +4633,10 @@ const typesText = el => el?.matches?.('textarea, input:not([type=range], [type=c
 document.addEventListener("focusin", e => document.body.classList.toggle("typing", !!typesText(e.target)));
 document.addEventListener("focusout", () => document.body.classList.remove("typing"));
 
-// ---- keyboard and trackpad: events go to KDE Connect on the Frame (see ui/frame_input_agent.py) ----
+// ---- keyboard and trackpad: events go to the Frame through gamescope (ui/frame_touch.py); accents and emoji through KDE Connect ----
 const pad = { state: "off", queue: [], sending: false, poll: null, captured: false };
 const PAD_STATES = {
-  off: "", starting: "Connecting…", installing: "Setting up KDE Connect on the Frame (first time only)…",
+  off: "", starting: "Connecting…", installing: "Setting up (first time only)…",
   pairing: "Pairing with KDE Connect…", ready: "On",
 };
 // KDE Connect's specialKey numbers (plugins/mousepad in its source).
@@ -4552,7 +4656,7 @@ function padShow(status) {
   $("padArea").classList.toggle("off", !ready);
   $("padBody").hidden = pad.state === "off";
   $("padIntro").hidden = pad.state !== "off";
-  $("padHint").textContent = pad.state === "error" ? status.message || "Couldn't reach KDE Connect on the Frame."
+  $("padHint").textContent = pad.state === "error" ? status.message || "Couldn't reach the Frame."
     : !ready ? (busy ? PAD_STATES[pad.state] : "Turn on to use this as a trackpad for the Frame.")
     : TOUCH ? "Drag to move the pointer · tap to click · two fingers to scroll · two-finger tap to right-click"
     : pad.captured ? "Your mouse and keyboard now control the Frame. Press Esc to stop."

ui/server.py

@@ -63,6 +63,7 @@ import frame_report  # noqa: E402
 import frame_store  # noqa: E402
 import frame_telemetry  # noqa: E402
 import frame_titles  # noqa: E402
+import frame_touch  # noqa: E402
 import frame_webinstall  # noqa: E402
 import frame_vr  # noqa: E402
 import frame_utilities  # noqa: E402
@@ -115,6 +116,9 @@ def route(alias, host_opts):
     with _route_lock:
         moved = alias != FRAME
         if moved:
+            reset_pad = globals().get("reset_pad_route")
+            if reset_pad:
+                reset_pad()  # cancel old input before any agent can start on the new route
             frame_catalog._env.clear()  # the SteamOS and Lepton builds reports record are per headset
         FRAME = frame_android.FRAME = alias
         HOST_OPTS = list(host_opts)
@@ -125,9 +129,6 @@ def route(alias, host_opts):
     mv = globals().get("macview")
     if mv:
         mv.retarget(alias, host_opts)  # its tunnel is its own ssh: it must follow the headset too
-    agent = globals().get("_input")
-    if moved and agent:
-        agent.stop()  # typing and pointing mustn't go on reaching the headset switched away from
 
 
 LINK = None  # the connector (frame_link.Link); None on the Frame itself
@@ -709,13 +710,14 @@ def launch(body):
     return {"message": f"Launching {appid}"}
 
 
-def steam_frame(*args, timeout=40):
-    """Run frame_steam.py on the Frame (it drives the Steam client) and return its JSON."""
+def steam_frame(*args, timeout=40, script="frame_steam.py"):
+    """Run frame_steam.py (it drives the Steam client), or another on-Frame
+    helper with the same JSON contract, on the Frame and return its JSON."""
     try:
         out = ssh("python3 - " + " ".join(map(shlex.quote, args)),
-                  stdin=(HERE / "frame_steam.py").read_text(), timeout=timeout)
+                  stdin=(HERE / script).read_text(), timeout=timeout)
     except Failure as e:
-        # frame_steam.py prints {"error": ...} on stdout when it fails, but ssh()
+        # The helper prints {"error": ...} on stdout when it fails, but ssh()
         # reports stderr instead if there was any, so look in both.
         for line in [*reversed(getattr(e, "stdout", "").splitlines()), *reversed(str(e).splitlines())]:
             try:
@@ -766,6 +768,20 @@ def vr(body):
     return result
 
 
+# Downloads are about 20 MB; starting waits for the game, the injection and SteamVR.
+MOD_TIMEOUT = {"status": 40, "install": 600, "start": 900, "uninstall": 60}
+
+
+def mods(body):
+    """UEVR for one installed Unreal game: status, install, start (inject) or uninstall."""
+    appid, action = str(body.get("appid", "")), body.get("action")
+    if not APPID.match(appid):
+        raise Failure("bad appid", 400)
+    if action not in MOD_TIMEOUT:
+        raise Failure("action must be " + ", ".join(MOD_TIMEOUT), 400)
+    return steam_frame(action, appid, timeout=MOD_TIMEOUT[action], script="frame_mods.py")
+
+
 def steam_search(query):
     q = parse_qs(query)
     cc = (q.get("cc") or [""])[0].upper()
@@ -1153,12 +1169,192 @@ def licenses():
     return notices
 
 
+# KDE Connect's specialKey numbers -> Linux key codes (KEY_BACKSPACE, KEY_TAB, ...).
+PAD_KEYS = {1: 14, 2: 15, 4: 105, 5: 103, 6: 106, 7: 108, 8: 104, 9: 109, 10: 102, 11: 107, 12: 28, 13: 111, 14: 1,
+            **{21 + i: code for i, code in enumerate([59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 87, 88])}}
+PAD_MODS = (("ctrl", 29), ("alt", 56), ("shift", 42), ("super", 125))
+PAD_CLICKS = {"singleclick": "left", "rightclick": "right", "middleclick": "middle"}
+PAD_NOTCH = 15  # scroll units for one wheel notch
+
+
+def typed_in_kde(events):
+    """Whether these events must go the KDE Connect way: they hold an accent or emoji, or
+    earlier ones are queued, being sent or still being typed there (typing must stay in
+    order, so it can't be split between the two ways)."""
+    with _kde_lock:
+        waiting = bool(_kde_queue) or time.time() < _kde_until
+    return waiting or any(ch not in frame_touch.ASCII for e in events for ch in e.get("key", ""))
+
+
+def pad_events(events, kde=False):
+    """The trackpad's and key row's events as (gamescope events, KDE Connect events).
+
+    Gamescope's own input reaches every panel and needs nothing installed, but types only
+    US-keyboard characters. With kde, the keyboard goes to KDE Connect as it was sent, so
+    text stays in order; the pointer always goes through gamescope.
+    """
+    ascii_keys = frame_touch.ASCII
+    out, slow = [], []
+
+    def tap(code, mods):
+        down = [{"key": c, "down": True} for c in mods]
+        out.extend(down + [{"key": code, "down": True}, {"key": code, "down": False}]
+                   + [{"key": c, "down": False} for c in reversed(mods)])
+    for e in events:
+        mods = [code for name, code in PAD_MODS if e.get(name)]
+        if "dx" in e or "dy" in e:
+            if not e.get("scroll"):
+                out.append({k: e[k] for k in ("dx", "dy") if k in e})
+        if e.get("scroll"):
+            out.append({"scroll": [0, -(e.get("dy") or 0) * PAD_NOTCH]})
+        for flag, button in PAD_CLICKS.items():
+            if e.get(flag):
+                out += [{"button": button, "down": True}, {"button": button, "down": False}]
+        if e.get("doubleclick"):
+            out += [{"button": "left", "down": d} for d in (True, False, True, False)]
+        if e.get("singlehold"):
+            out.append({"button": "left", "down": True})
+        if e.get("singlerelease"):
+            out.append({"button": "left", "down": False})
+        if kde and ("key" in e or "specialKey" in e):
+            slow.append({k: e[k] for k in ("key", "specialKey", "ctrl", "alt", "shift", "super") if k in e})
+            continue
+        if "specialKey" in e and e["specialKey"] in PAD_KEYS:
+            tap(PAD_KEYS[e["specialKey"]], mods)
+        if "key" in e:
+            for ch in e["key"]:
+                if ch not in ascii_keys:
+                    continue  # only reached when kde is wrong; the caller checks typed_in_kde first
+                elif mods:
+                    code, shifted = ascii_keys[ch]
+                    tap(code, mods + ([42] if shifted and 42 not in mods else []))
+                else:
+                    if out and "text" in out[-1] and len(out[-1]["text"]) < 100:
+                        out[-1]["text"] += ch
+                    else:
+                        out.append({"text": ch})
+    return out, slow
+
+
 def remote_input(body):
-    """{"events": [...]} sends keyboard and pointer events; {} (or none yet) just starts the agent."""
+    """{"events": [...]} sends keyboard and pointer events; {} (or none yet) just starts the agent.
+
+    "sent" in the answer means the whole batch is taken (the page keeps it and tries again
+    if not), so the keyboard's share is queued only once that's so.
+    """
     events = body.get("events", [])
     if not isinstance(events, list) or len(events) > INPUT_BATCH_LIMIT:
         raise Failure(f"events must be a list of at most {INPUT_BATCH_LIMIT}", 400)
-    return _input.send([input_event(e) for e in events])
+    events = [input_event(e) for e in events]
+    touch, slow = pad_events(events, typed_in_kde(events))
+    status = _touch.send(touch)
+    if touch and not status.get("sent"):
+        return status
+    if touch:
+        _note_typed(touch)
+    if slow:
+        _queue_for_kde(slow)
+    return {**status, "sent": True}
+
+
+# Typing KDE Connect is to do: it starts the first time it's needed, so this waits for it.
+# Nothing on the Frame says when typed text has landed, so each way holds the other back
+# for as long as what it was given should take (a short margin on a time estimate).
+_kde_queue = []
+_kde_lock = threading.Lock()
+_pad_send_lock = threading.Lock()
+_kde_worker = [None]
+_kde_until = 0.0     # keys typed through KDE Connect should have landed by then
+_typed_until = 0.0   # when gamescope's agent will have typed everything it's been given
+_kde_route = object()
+_kde_cancel = threading.Event()
+KDE_QUEUE_LIMIT = 200
+KDE_WAIT = 90  # seconds to wait for KDE Connect before giving up on what's queued
+TYPING_SETTLE = 0.6  # seconds past the estimate, once
+
+
+def reset_pad_route():
+    """Discard input for the headset being left, including batches waiting for an agent."""
+    global _kde_route, _kde_cancel, _kde_until, _typed_until
+    with _pad_send_lock, _kde_lock:
+        _kde_cancel.set()
+        _kde_cancel = threading.Event()
+        _kde_route = object()
+        _kde_queue.clear()
+        _kde_worker[0] = None
+        _kde_until = _typed_until = 0.0
+        _input.stop()
+        _touch.stop()
+
+
+def typing_seconds(touch):
+    """How long gamescope's agent takes over these: it sleeps 8 ms after every key transition."""
+    transitions = 0
+    for e in touch:
+        if "text" in e:
+            transitions += sum(2 + 2 * frame_touch.ASCII[ch][1] for ch in e["text"] if ch in frame_touch.ASCII)
+        elif "key" in e:
+            transitions += 1
+    return transitions * 0.008
+
+
+def _note_typed(touch):
+    global _typed_until
+    seconds = typing_seconds(touch)
+    if seconds:
+        with _kde_lock:  # the end of the work, which queues up; the margin is added once, where it's checked
+            _typed_until = max(_typed_until, time.time()) + seconds
+
+
+def _queue_for_kde(events):
+    with _kde_lock:
+        _kde_queue.extend(events)
+        del _kde_queue[:-KDE_QUEUE_LIMIT]
+        if _kde_worker[0] is None:
+            _kde_worker[0] = threading.Thread(target=_drain_kde, args=(_kde_route, _kde_cancel), daemon=True)
+            _kde_worker[0].start()
+
+
+def _drain_kde(route, cancel):
+    """The only sender, in order. A batch leaves the queue while it's being sent (the queue
+    can be trimmed meanwhile) and goes back to the front if it didn't go."""
+    global _kde_until
+    deadline = time.time() + KDE_WAIT
+    while True:
+        with _kde_lock:
+            if route is not _kde_route:
+                return
+            batch = _kde_queue[:INPUT_BATCH_LIMIT]
+            del _kde_queue[:len(batch)]
+            if not batch:
+                _kde_worker[0] = None  # retired under the lock, so a new request starts another
+                return
+            wait = _typed_until + TYPING_SETTLE - time.time()
+            _kde_until = time.time() + 3600  # held while in flight
+        if wait > 0 and cancel.wait(wait):
+            return  # a switch cancels the delay and its old-headset batch
+        # Serialize sending with route resets without blocking callers from queuing input.
+        with _pad_send_lock:
+            with _kde_lock:
+                if route is not _kde_route:
+                    return
+            status = _input.send(batch)
+        with _kde_lock:
+            if route is not _kde_route:
+                return
+            if status.get("sent"):
+                _kde_until = time.time() + len(batch) * 0.03 + TYPING_SETTLE
+                deadline = time.time() + KDE_WAIT
+                continue
+            _kde_until = 0.0
+            if status.get("state") == "error" or time.time() > deadline:
+                _kde_queue.clear()  # not coming; don't hold it forever
+                _kde_worker[0] = None
+                return
+            _kde_queue[:0] = batch
+            del _kde_queue[:-KDE_QUEUE_LIMIT]  # as when queuing: the oldest go first
+        if cancel.wait(0.4):
+            return
 
 
 # ---- touch: the headset's panels, through gamescope's own input (frame_touch.py) ----
@@ -2489,7 +2685,7 @@ POST = {
     "/api/agent/approval": agent_approval, "/api/assistant/chat": assistant_chat,
     "/api/input": remote_input, "/api/touch": remote_touch,
     "/api/settings/artwork": frame_steamgriddb.save_settings,
-    "/api/sources": source_manage, "/api/sources/install": source_install, "/api/android/display": android_display, "/api/android": android, "/api/quest": quest, "/api/meta": meta, "/api/queue": queue_action, "/api/titles": titles, "/api/launch": launch, "/api/steam": steam, "/api/volume": set_volume, "/api/clipboard": clipboard,
+    "/api/sources": source_manage, "/api/sources/install": source_install, "/api/android/display": android_display, "/api/android": android, "/api/quest": quest, "/api/meta": meta, "/api/queue": queue_action, "/api/titles": titles, "/api/launch": launch, "/api/steam": steam, "/api/mods": mods, "/api/volume": set_volume, "/api/clipboard": clipboard,
         "/api/flatpak": flatpak, "/api/open": open_thing, "/api/shots/save": save_shots,
         "/api/webinstall/check": webinstall_check, "/api/webinstall/start": webinstall_start,
         "/api/webinstall/cancel": webinstall_cancel,
@@ -2730,7 +2926,7 @@ class Handler(BaseHTTPRequestHandler):
             elif path == "/api/touch":
                 self.send_json(_touch.send([]) if parse_qs(url.query).get("start") == ["1"] else dict(_touch.status))
             elif path == "/api/input":
-                self.send_json(_input.send([]) if parse_qs(url.query).get("start") == ["1"] else dict(_input.status))
+                self.send_json(_touch.send([]) if parse_qs(url.query).get("start") == ["1"] else dict(_touch.status))
             elif path == "/api/job":
                 self.send_json(job_status(url.query))
             elif path == "/api/queue":