feat(plex): player HTPC polish — Stop button, keyboard help, time-remaining + clock, scroll-restore

- Explicit Stop button (stops playback + returns to the library).
- Keyboard cheat-sheet overlay toggled with 'H' (movie hides the episode-nav row).
- Backspace = stop & back to feed (HTPC-remote convention); closes the help first.
- Time-remaining readout beside the seek bar + a live wall clock in the top bar
  (both fade with the controls).
- PlexBrowse restores the grid scroll position when returning from the player, so
  Back lands on the same card instead of the top of the library.
- New plex.player i18n keys (stop/help/keys.*) in en/hu/de.

frontend/src/lib/releaseNotes.ts

@@ -14,6 +14,19 @@ export interface ReleaseEntry {
 }
 
 export const RELEASE_NOTES: ReleaseEntry[] = [
+  {
+    version: "0.24.0",
+    date: "2026-07-05",
+    summary: "Plex player polish: a Stop button, a keyboard help overlay, time-remaining and a clock, and Back returns you to your place in the library.",
+    features: [
+      "Plex player: added an explicit Stop button, a time-remaining readout next to the seek bar, and a live clock in the top corner (both fade with the controls).",
+      "Plex player: press “H” (or the keyboard button) for an on-screen cheat sheet of all shortcuts.",
+      "Plex player: Backspace now stops playback and returns to the library — the same as the mouse Back button — matching a typical HTPC remote.",
+    ],
+    fixes: [
+      "Plex library: pressing Back from the player now returns you to the exact spot you were scrolled to, instead of jumping to the top of the library.",
+    ],
+  },
   {
     version: "0.23.2",
     date: "2026-07-05",