Redesign Hope iOS UI, harden playback, and document project handoff

docs/DEVICE_TESTING.md

@@ -33,8 +33,8 @@ ensure the server cert pin is current (see README — re-export after any server
 
 ## 4. Audible media playback
 
-- [ ] Requires a track in an iOS-decodable format (m4a/aac/mp3) — current library tracks
-    are webm and will fail with `-11828` until the server serves a supported format.
+- [ ] The deployed server now serves cached AAC for library tracks requested with
+    `?format=m4a`; verify actual speaker/headphone output on hardware.
 - [ ] Play a library track: audio is audible, now-playing card shows art/title/status.
 - [ ] Pause / ±10 s / stop / seek all work; agent mics off while playing
     (`media_state` published), mics back on when stopped.