feat(plex): info-page polish — per-source strip toggles, glassy look, scroll restore

From UAT feedback on the collections info page:
- Per-source show/hide toggles in the customize menu, one per collection-strip
  type present on the item (Collections/IMDb/TMDb/…), persisted per account.
- Customize menu closes on Escape / outside click (reuses useDismiss).
- Preserve the info-page scroll position when returning from "Browse collection".
- Glassy refresh: content floats as .glass/.glass-card panels over a faint FIXED
  art backdrop on the <main> scroller (HTPC-style, toggleable); frosted menu;
  wider ~90% layout. Uses the existing glass surface system.

frontend/src/lib/releaseNotes.ts

@@ -22,6 +22,8 @@ export const RELEASE_NOTES: ReleaseEntry[] = [
       "Plex collections: every Plex collection (franchises like Avatar, curated sets, and community lists like IMDb Top 250) is now mirrored locally by the background sync, so browsing is instant — no more waiting on Plex's slow collection queries.",
       "Plex library: a searchable Collection filter in the sidebar — pick a collection to see just its titles, combinable with every other filter.",
       "Plex info page: a title's collection(s) now appear as strips of the sibling films, playable straight from there (most-specific collection first).",
+      "Plex info page: show or hide each collection-strip type independently — keep genuine franchises (Avatar, James Bond) while hiding the big auto-lists (IMDb Top 250, TMDb Trending), remembered per account.",
+      "Plex info page: a refreshed, wider layout — content floats as frosted-glass panels over a faint, fixed backdrop of the title's own art (toggleable), matching the app's glassy look.",
     ],
   },
   {