feat(voice): unified mobile voice bar with gesture-isolated PTT row

Replace separate VoiceStatusChip + VoicePttButton with a single
CompactVoiceBar widget that combines both into a two-row layout:

- Control row (tap): status text, mute, deafen, settings chevron
- PTT row (hold): full-width hold-to-talk, shown only in PTT mode

Gesture isolation prevents mis-touch between rows: the control row
uses tap-only InkWell/IconButton while the PTT row uses a raw
Listener for pointer-down/up events.

Key changes:
- Add CompactVoiceBar widget with state-colored container (normal,
  muted, talk-power-blocked)
- Remove mute/deafen IconButtons from AppBar headerActions
- Restructure voice details sheet into primary section + collapsible
  ExpansionTiles (audio processing, PTT capability, debug)
- Optimistic state updates for mute/deafen to eliminate tap delay
- Instant PTT visual feedback (no AnimatedContainer fade)
- Constant geometry across all states (no layout shift on toggle)

apps/chanora_flutter/lib/main.dart

@@ -1126,14 +1126,18 @@ class _BetaHomeState extends State<_BetaHome> with WidgetsBindingObserver {
 
   Future<void> _toggleOutputMute() async {
     final next = !_outputMuted;
+    // Optimistic: flip the UI immediately.
+    setState(() {
+      _outputMuted = next;
+    });
     try {
       await rust.setOutputMuted(muted: next);
-      if (!mounted) return;
-      setState(() {
-        _outputMuted = next;
-      });
     } catch (e) {
       if (!mounted) return;
+      // Roll back on failure.
+      setState(() {
+        _outputMuted = !next;
+      });
       _showUiError('output mute', e);
     }
   }
@@ -1260,6 +1264,13 @@ class _BetaHomeState extends State<_BetaHome> with WidgetsBindingObserver {
       return;
     }
     final next = !_hardMute;
+    // Optimistic: flip the UI immediately so the icon responds
+    // before the two bridge calls round-trip through FFI.
+    setState(() {
+      _inputMuted = next;
+      _hardMute = next;
+      _hardMuteByPermission = false;
+    });
     try {
       // Hard-mute is two coordinated effects:
       //  * setHardMute  — local TransmitGate clamp; we stop sending
@@ -1272,14 +1283,13 @@ class _BetaHomeState extends State<_BetaHome> with WidgetsBindingObserver {
       // through. Drive them together.
       await rust.setHardMute(muted: next);
       await rust.setInputMuted(muted: next);
-      if (!mounted) return;
-      setState(() {
-        _inputMuted = next;
-        _hardMute = next;
-        _hardMuteByPermission = false;
-      });
     } catch (e) {
       if (!mounted) return;
+      // Roll back on failure.
+      setState(() {
+        _inputMuted = !next;
+        _hardMute = !next;
+      });
       _showUiError('hard mute', e);
     }
   }
@@ -2145,26 +2155,6 @@ class _BetaHomeState extends State<_BetaHome> with WidgetsBindingObserver {
     final theme = Theme.of(context);
 
     final headerActions = [
-      if (_serverReachable && _inChannel) ...[
-        IconButton(
-          tooltip: _hardMuteByTalkPower
-              ? 'Insufficient talk power to speak in this channel'
-              : l10n.voiceHardMuteLabel,
-          icon: Icon(_hardMute ? Icons.mic_off : Icons.mic),
-          isSelected: _hardMute,
-          selectedIcon: const Icon(Icons.mic_off),
-          color: _hardMute ? theme.colorScheme.error : null,
-          onPressed: _hardMuteByTalkPower ? null : _onToggleHardMute,
-        ),
-        IconButton(
-          tooltip: l10n.voiceOutputMuteLabel,
-          icon: Icon(_outputMuted ? Icons.headset_off : Icons.headset),
-          isSelected: _outputMuted,
-          selectedIcon: const Icon(Icons.headset_off),
-          color: _outputMuted ? theme.colorScheme.error : null,
-          onPressed: _toggleOutputMute,
-        ),
-      ],
       IconButton(
         tooltip: l10n.aboutAction,
         icon: const Icon(Icons.info_outline),
@@ -2449,7 +2439,8 @@ class _BetaHomeState extends State<_BetaHome> with WidgetsBindingObserver {
                         Expanded(child: snapshotView),
                         const SizedBox(height: 8),
                         permissionBanner,
-                        VoiceStatusChip(
+                        CompactVoiceBar(
+                          inChannel: _inChannel,
                           transmitMode: _transmitMode,
                           releaseTailMs: _releaseTailMs,
                           pttBoundKeyLabel: _pttBoundKeyLabel,
@@ -2457,19 +2448,15 @@ class _BetaHomeState extends State<_BetaHome> with WidgetsBindingObserver {
                           isTouchOnly: isTouchOnlyPttHost,
                           inputMuted: _hardMute,
                           outputMuted: _outputMuted,
+                          onToggleInputMute: _onToggleHardMute,
+                          onToggleOutputMute: _toggleOutputMute,
+                          onOpenDetails: () => _onOpenVoiceDetailsSheet(),
+                          onPttHeldChanged: _onOnscreenPttHeldChanged,
                           talkPower: ownClientState?.talkPower,
                           neededTalkPower: ownClientState?.neededTalkPower,
                           talkPowerGranted: ownClientState?.talkPowerGranted,
-                          onTap: () => _onOpenVoiceDetailsSheet(),
+                          hardMuteByTalkPower: _hardMuteByTalkPower,
                         ),
-                        if (_inChannel &&
-                            _transmitMode == rust.BridgeTransmitMode.ptt) ...[
-                          const SizedBox(height: 8),
-                          VoicePttButton(
-                            active: _audioStats?.pttActive ?? false,
-                            onHeldChanged: _onOnscreenPttHeldChanged,
-                          ),
-                        ],
                       ],
                     );
                   },