Improve iOS voice stability and user audio controls

PROGRESS.md

@@ -25,6 +25,10 @@ verified on an iPhone 16 Pro Max with a two-channel AVAudioEngine input and dist
 samples; the managed Apple binding requires native use of its otherwise-unmapped stereo polar
 pattern constant.
 
+The iOS user list now opens a remote-user detail view with independent tuning for each active
+audio stream. Private messages are grouped into per-user conversations with direct access to the
+same user and audio controls.
+
 SQLite schema v4 persists DRED and the channel packet-loss mode. Manual loss remains the default;
 automatic Fast/Balanced/Stable modes measure each sender's authenticated UDP uplink at the server,
 cap the applied Opus hint at 30%, and feed it back over TLS.
@@ -35,9 +39,12 @@ cap the applied Opus hint at 30%, and feed it back over TLS.
   20/40/60 ms buffering, duration-aware DRED/FEC, automatic packet-loss feedback, and mismatched
   input/output endpoints.
 - Complete NVDA and VoiceOver navigation/announcement passes.
+- Verify iOS remote-user tuning and private-conversation navigation with VoiceOver, including
+  multiple streams, users without active streams, and users who disconnect while a view is open.
 - Exercise iOS background/lock, interruption, Bluetooth, route-change, ReplayKit, and iOS 27
-  ScreenCaptureKit paths on devices. Complete extended mono/stereo/voice-chat switching while
-  joined, and verify Windows desktop/per-app stereo sharing.
+  ScreenCaptureKit paths on devices. Complete a 30-minute iOS call and Wi-Fi/cellular switching
+  with voice restoration, plus extended mono/stereo/voice-chat switching while joined. Verify
+  Windows desktop/per-app stereo sharing.
 - Complete Developer ID signing/notarization. The iOS host and ReplayKit extension have been
   distribution-signed and packaged locally; upload the IPA for Apple's server-side validation.
 - Run the published Linux container and a 30-minute-or-longer server soak.