Map downloads on join, faster mod merging, connect cards in the server browser

Map downloader
- A host or dedicated server now tells joiners which Thunderstore package
  its map comes from (the Mods folder name plus manifest.json).
- A player without the map gets a card: icon, name, author, version and
  description, with DOWNLOAD and CANCEL. It works with mouse, keyboard and
  controller.
- Only packages listed as Maps in the ReSkate community are offered, and
  never deprecated, rejected or NSFW ones.
- On yes the package is downloaded, installed into Mods and applied as a
  live mod, then the session loads the map. A small card on the right
  shows the progress, so the player can keep skating.
- The player stays connected while it downloads: the host gives a player
  who says they are fetching the map up to 45 minutes instead of the
  usual load time.
- When the server changes map with the player in it, the card says so.
- Protocol version 47: map package on map_offer and world_state, and a
  "fetching the map" flag on map_request and world_ready.

Joining
- The pause-menu server browser shows a CONNECTING card over the page
  while a join is under way, and a COULDN'T CONNECT card with the reason
  when it does not get in.
- The session and voice tabs no longer show before the player is in.
- Leaving without the map (declined or cancelled download) no longer
  counts towards the failed-join limit, on servers and player hosts.

Input
- A card that asks something holds the game's input until the buttons
  are released.
- Steam's overlay hooks XInput in front of ReSkate and answers the game
  itself, so a controller reached the game behind menus. ReSkate now
  hooks that hook as well.

Mod merging
- Mods are read on several threads, at launch and for live merges. A live
  merge runs below the game's priority.
- The paid-cosmetics check reads the game's files and the mods on several
  threads.
- A live merge reuses the paid-cosmetics verdicts it already has and
  reports its progress and timings.

Launcher
- NSFW mods and their categories are not shown in the mod browser.

Runtime/runtime_init.cpp

@@ -9,6 +9,7 @@
 #include "Engine/Game/Build/20260929/profiler_labels.h"
 #include "Engine/Game/Build/supported_build.h"
 #include "Engine/Vfs/mod_catalog.h"
+#include "Extension/Assets/map_download.h"
 #include "Extension/Boot/offline_boot.h"
 #include "Extension/HallOfMeat/hall_of_meat.h"
 #include "Extension/Skater/camera_observer.h"
@@ -189,6 +190,34 @@ extern "C" __declspec(dllexport) BOOL WINAPI DingoSDKDebugInitialize() {
         dingosdk::multiplayer::set_native_menu_callbacks(native_callbacks);
         dingosdk::overlay::set_multiplayer_queue(queue_multiplayer_command);
         dingosdk::overlay::set_chat_feed(dingosdk::multiplayer::chat);
+        // A map a session needs: hosts say which Thunderstore package theirs is from, and a
+        // guest without it is offered it on a card (Extension/Assets/map_download.h).
+        dingosdk::multiplayer::set_map_package_lookup(dingosdk::map_download::package_of);
+        dingosdk::overlay::set_map_download_feed([]() {
+            const auto view = dingosdk::map_download::view();
+            using Stage = dingosdk::map_download::Stage;
+            dingosdk::overlay::MapDownloadCard card;
+            card.stage = view.stage == Stage::asking ? 1 : view.stage == Stage::downloading ? 2 : view.stage == Stage::installing ? 3
+                       : view.stage == Stage::applying ? 4 : view.stage == Stage::joining ? 5 : 0;
+            card.map = view.map;
+            card.package = view.package;
+            card.author = view.author;
+            card.version = view.version;
+            card.description = view.description;
+            card.step = view.step;
+            card.steps = view.steps;
+            card.step_name = view.step_name;
+            card.server = view.server;
+            card.moved = view.moved;
+            card.installed = view.installed;
+            card.choice = view.choice;
+            card.received = view.received;
+            card.total = view.total;
+            card.yes_bind = view.yes_bind;
+            card.no_bind = view.no_bind;
+            return card;
+        });
+        dingosdk::overlay::set_map_download_answer(dingosdk::map_download::answer);
         dingosdk::overlay::set_hub_page_feed(dingosdk::multiplayer::native_menu_page);
         dingosdk::overlay::set_hub_callbacks(native_callbacks);
         dingosdk::overlay::set_ui_sound(dingosdk::multiplayer::queue_ui_sound);