Fix Steam renderer crash when LiquidAss is launched from +

A top-level @starting-style on the light layer's ::after (registered
custom properties under the @container style() gate) SEGVs Steam's
Chromium 126 renderer when the theme is injected while the pointer rests
on a hovered element. Launching LiquidAss from + > Launch Program does
exactly that: the laser is still on the row when the stylesheet lands,
so every launch crashed the whole gamepad UI (reproduced 3/3 with real
clicks; CSS-only reproduces too; gone without the rule).

The ramp in from dark is now a keyframe animation (lgs-ill-in) scoped to
the illumination hosts' in-rule, so it no longer reaches Steam's own
::after either.

Home's gamepad focus and blur handlers return when the module is torn
down, so turning the theme off no longer throws in 41-home.js.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

device/rt/41-home.js

@@ -639,6 +639,7 @@ function homeComponents(R, rt) {
       onMenuButton: isGame && HS.appMenu ? (e) => homeTileMenu(R, item, e && e.currentTarget) : undefined,
       onMenuActionDescription: isGame && HS.appMenu ? (homeStr(R, 'options') || undefined) : undefined,
       onGamepadFocus: (e) => {
+        if (!HS) return; // module torn down (lgs off) while Steam still moves focus on the leaving page
         const sk = HS.sectionKey || 'x';
         HS.focusKey[sk] = item.key;
         // focus that Steam moved into row 1 from outside our page (C1a's search capsule above a folder's
@@ -651,7 +652,8 @@ function homeComponents(R, rt) {
         if (d && HS.P.attention && homePad()) HS.P.attention.feed(d, 'enter', 'pad');
       },
       onGamepadBlur: (e) => {
-        const d = e && e.currentTarget && e.currentTarget.querySelector ? e.currentTarget.querySelector('.lgs-home-disc') : null;
+        if (!HS) return;
+        const d =e && e.currentTarget && e.currentTarget.querySelector ? e.currentTarget.querySelector('.lgs-home-disc') : null;
         if (d && HS.P.attention) HS.P.attention.feed(d, 'leave', 'pad');
         // gamepad: the card starts closing at the move, not after the 0.3 s grace (HA-17); a bounce back
         // within the grace restores it through onReenter

theme/02-motion.nowrap.css

@@ -231,15 +231,12 @@ html.lgs-on .lgs-arrive { animation: lgs-arrive var(--lgs-motion-page) backwards
 
 /* ------------------------------------------------- the light layer's ramp in
    An illumination host's ::after exists only while the host is lit (04-states.css, the hook blocks' gate),
-   so it is created already lit: it starts from dark, and the in-transitions (04-states.css §2) ramp hover,
-   within and press up as they did when the layer was always there. Top level: Chromium 126 ignores
-   @starting-style nested in a style rule (the wrapped files). Focus jumps in (0s) through lgs-focus-in. */
-@starting-style {
-  html.lgs-on:not(.lgs-input-pad) :hover::after,
-  html.lgs-on:not(.lgs-input-laser) :is(.gpfocus, .gpfocuswithin)::after,
-  html.lgs-on :is(:active, .lgs-pressed)::after {
-    --lgs-hover: 0;
-    --lgs-within: 0;
-    --lgs-press: 0;
-  }
+   so it is created already lit: lgs-ill-in starts it from dark (04-states.css §2, the in-rule), and the
+   in-transitions take over after. Focus jumps in (0s) through lgs-focus-in.
+   Never @starting-style here: on Steam's Chromium 126, a top-level @starting-style on these ::after
+   (registered properties, under the @container style() gate) SEGVs the whole renderer when the theme is
+   injected while the pointer rests on a lit host, e.g. the LiquidAss row of "+" > Launch Program
+   (2026-10-09, reproduced 3/3; gone without the rule). */
+@keyframes lgs-ill-in {
+  from { --lgs-hover: 0; --lgs-within: 0; --lgs-press: 0; }
 }

theme/04-states.css

@@ -243,11 +243,13 @@
       --lgs-focus 0s,
       --lgs-within var(--lgs-ill-d-in) var(--lgs-ill-ease),
       --lgs-press var(--lgs-ill-d-press) var(--lgs-ill-ease-press);
-    /* created lit (the hook blocks' gate): its ramp in starts from dark, @starting-style in
-       02-motion.nowrap.css (Chromium 126 ignores it nested in this wrapped file) */
+    /* created lit (the hook blocks' gate): its ramp in starts from dark (lgs-ill-in,
+       02-motion.nowrap.css; never @starting-style, which crashes Steam's renderer) */
+    animation: lgs-ill-in var(--lgs-ill-d-in) var(--lgs-ill-ease) backwards;
   }
   &:not(.lgs-input-laser) .gpfocus::after {
-    animation: lgs-focus-in var(--lgs-ill-d-in) var(--lgs-ill-ease) backwards;
+    animation: lgs-ill-in var(--lgs-ill-d-in) var(--lgs-ill-ease) backwards,
+               lgs-focus-in var(--lgs-ill-d-in) var(--lgs-ill-ease) backwards;
   }
 }