release: 0.50.0 — R1 quick-win sweep

Ships R1 (S1 backend safety, S2 frontend interaction, S3 i18n/a11y) plus the
code-review follow-ups (filename byte-cap, demo deep_requested guard, release-notes
highlight fallback). Mixed epic, so a real user-facing note: download-overwrite +
long-title fixes, Escape layering, Plex light-theme menus, toast timer, unsubscribe
error, modal-close i18n, toast aria-live; keyboard + hardening under chores.

VERSION

@@ -1 +1 @@
-0.49.0
+0.50.0

frontend/src/lib/releaseNotes.ts

@@ -14,6 +14,23 @@ export interface ReleaseEntry {
 }
 
 export const RELEASE_NOTES: ReleaseEntry[] = [
+  {
+    version: "0.50.0",
+    date: "2026-07-22",
+    summary: "A sweep of small correctness, keyboard and accessibility fixes across the app.",
+    fixes: [
+      "Downloads: two different formats of the same video no longer overwrite each other on disk (and deleting one no longer removes the other's file). Videos with very long titles — especially accented, non-English ones — no longer fail to save.",
+      "In the video player, pressing Escape now closes just the top layer — the open popover or dialog — instead of also closing the player behind it.",
+      "Plex player: the audio and subtitle menus are readable in the light theme again (they were white-on-white).",
+      "A repeated notification that resurfaces now stays on screen for its full time instead of vanishing early.",
+      "Unsubscribing from a channel now tells you if it failed, instead of failing silently.",
+      "The ✕ close button on dialogs is now translated (it was always English), and screen readers now announce toast notifications.",
+    ],
+    chores: [
+      "Keyboard: reorder a side panel's sections with the keyboard, and Space now activates a focused button in the player instead of toggling playback.",
+      "Hardening: rate-limited the access-request endpoint and closed a couple of sign-in token races; the demo account can no longer spend YouTube quota; assorted internal safety and performance fixes.",
+    ],
+  },
   {
     version: "0.49.0",
     date: "2026-07-21",