fix(watch): drop the Web Audio reroute, keep Media Session for iOS background audio (0.57.2)

Reported: on iPad Brave a shared video's audio still stopped when backgrounded, while youtube.com
keeps playing. Root cause: routing the element's audio through createMediaElementSource pulls it out
of the normal media pipeline the browser's background-playback feature (and iOS) hooks into, and iOS
then suspends the AudioContext on background — the opposite of the goal. YouTube uses a plain media
element + Media Session and lets the browser background it. So drop the Web Audio graph entirely and
keep only the Media Session metadata + play/pause handlers, leaving native background handling in
charge. Frontend-only.

frontend/src/lib/releaseNotes.ts

@@ -14,6 +14,13 @@ export interface ReleaseEntry {
 }
 
 export const RELEASE_NOTES: ReleaseEntry[] = [
+  {
+    version: "0.57.2",
+    date: "2026-07-28",
+    chores: [
+      "Sharing: the shared-video page now advertises playback to the OS via the Media Session API only, dropping a Web Audio workaround that interfered with the browser's own background playback on iOS (it left the audio to be suspended when the tab was backgrounded, the opposite of the goal) — so background audio is left to the browser's native handling, the way it works for youtube.com.",
+    ],
+  },
   {
     version: "0.57.1",
     date: "2026-07-28",