fix: remove broken throttle from VirtualGrid scroll tracking (#12781)

## Summary

Every `VirtualGrid` consumer (assets sidebar, manager dialog, widget
select dropdown) is blind to discrete mouse-wheel scrolling:
`useScroll`'s `throttle: 64` never reports scroll position, so the
virtualization window stays frozen — users see blank space below the
first viewport of items and `approach-end` (infinite scroll) never
fires. Trackpad scrolling masks the bug by emitting events faster than
the throttle window.

## Changes

- **What**: drop the `throttle` option from `useScroll` in `VirtualGrid`
and remove the `scrollThrottle` prop (no consumer passes it). Scroll
events are frame-aligned and the handler is cheap, so the throttle
bought nothing even when it worked.
- **Root cause**: VueUse ≥14 `throttleFilter` with `leading=false` (what
`useScroll` uses) marks spaced-out events as executed without executing
them — each event re-arms an `isLeading` restore timer that makes the
next event skip its invoke, and the trailing branch is unreachable when
`elapsed > duration`. Regression of vueuse#2390; still present on vueuse
`main`.

## Review Focus

- Verified live against staging: with the throttle, sidebar scrolled to
`scrollTop` 1250 while `scrollY` stayed 0 and the render window stayed
at `[0..3)` of 27 (blank viewport); with this fix, `scrollY` tracks 1:1
and the window advances. Bare-vs-throttled `useScroll` compared
side-by-side on the same element to isolate the cause.
- Unblocks wheel-scroll for #12780's dropdown infinite scroll with no
changes there.

- Fixes FE-990

🤖 Generated with [Claude Code](https://claude.com/claude-code)

apps/website/public/site.webmanifest

@@ -1,23 +1,23 @@
 {
   "name": "Comfy",
   "short_name": "Comfy",
-  "id": "/",
-  "start_url": "/",
   "icons": [
     {
       "src": "/web-app-manifest-192x192.png",
       "sizes": "192x192",
       "type": "image/png",
-      "purpose": "any"
+      "purpose": "any maskable"
     },
     {
       "src": "/web-app-manifest-512x512.png",
       "sizes": "512x512",
       "type": "image/png",
-      "purpose": "any"
+      "purpose": "any maskable"
     }
   ],
   "theme_color": "#211927",
   "background_color": "#211927",
-  "display": "standalone"
+  "display": "standalone",
+  "id": "/",
+  "start_url": "/"
 }

apps/website/src/layouts/BaseLayout.astro

@@ -73,7 +73,7 @@ const websiteJsonLd = {
 
     <link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96" />
     <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
-    <link rel="shortcut icon" href="/favicon.ico" />
+    <link rel="shortcut icon" href="/favicon.ico" sizes="48x48" />
     <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
     <link rel="manifest" href="/site.webmanifest" />
     <meta name="theme-color" content="#211927" />

src/components/common/VirtualGrid.vue

@@ -33,7 +33,6 @@ const {
   items,
   gridStyle,
   bufferRows = 1,
-  scrollThrottle = 64,
   resizeDebounce = 64,
   defaultItemHeight = 200,
   defaultItemWidth = 200,
@@ -42,7 +41,6 @@ const {
   items: (T & { key: string })[]
   gridStyle: CSSProperties
   bufferRows?: number
-  scrollThrottle?: number
   resizeDebounce?: number
   defaultItemHeight?: number
   defaultItemWidth?: number
@@ -61,7 +59,6 @@ const itemWidth = ref(defaultItemWidth)
 const container = ref<HTMLElement | null>(null)
 const { width, height } = useElementSize(container)
 const { y: scrollY } = useScroll(container, {
-  throttle: scrollThrottle,
   eventListenerOptions: { passive: true }
 })