fix(voice): preserve mute owners and release touch ptt

apps/chanora_flutter/lib/services/hard_mute_owners.dart

@@ -0,0 +1,31 @@
+class HardMuteOwners {
+  const HardMuteOwners({
+    this.manual = false,
+    this.permission = false,
+    this.talkPower = false,
+  });
+
+  final bool manual;
+  final bool permission;
+  final bool talkPower;
+
+  bool get effective => manual || permission || talkPower;
+
+  HardMuteOwners withBridgeManualMute(bool muted) {
+    return copyWith(
+      manual: muted && (manual || !permission && !talkPower),
+    );
+  }
+
+  HardMuteOwners copyWith({
+    bool? manual,
+    bool? permission,
+    bool? talkPower,
+  }) {
+    return HardMuteOwners(
+      manual: manual ?? this.manual,
+      permission: permission ?? this.permission,
+      talkPower: talkPower ?? this.talkPower,
+    );
+  }
+}

apps/chanora_flutter/lib/services/ios_audio_session_controller.dart

@@ -37,6 +37,10 @@ class IosAudioSessionController {
       // exception to the event handler would be noise. The Rust
       // engine remains alive and will produce silence until the
       // next route change or a manual leave/rejoin.
+    } on MissingPluginException {
+      // Test hosts and mispackaged builds may not have registered
+      // the iOS channel. Keep event dispatch alive rather than
+      // surfacing an unhandled async error.
     }
   }
 
@@ -49,6 +53,9 @@ class IosAudioSessionController {
       // Worst case the session stays in .playAndRecord until the
       // app is backgrounded — at which point iOS reclaims the
       // session automatically.
+    } on MissingPluginException {
+      // Same rationale as activate(): missing channel should not
+      // break bridge event handling.
     }
   }
 }