feat: Android Oboe voice backend — WebRTC APM, VAD, HW/SW toggle, BBCode welcome, link trust, foreground task

Audio engine (Rust):
- Android Oboe: WebRTC APM (AEC/NS/AGC/HPF) + TEN/Silero ONNX VAD
- Hardware effects (JNI) with software fallback per-effect
- Render reference buffer for AEC between output/capture callbacks
- Voice activity gate: suppress transmission when speaker muted (all platforms)
- Audio focus (SDD-109) + Bluetooth SCO (SDD-110) via JNI
- ONNX Runtime 1.26 via ort 2.0.0-rc.12 (down from rc.10, ndarray 0.17)
- VAD worker channel capacity 8→32, initial seq u64::MAX (warm-up fix)
- TEN VAD default backend (was Silero)
- Platform→WebrtcApm resolution after hardware binding
- oboe-rs edisonjwa fork with get_raw_session_id()

Android Kotlin:
- AndroidAudioFocusController + AndroidBluetoothScoController
- AndroidAudioLifecycleController (route changes to Flutter)
- ProGuard rules for new controllers

Flutter UI:
- VoiceSettings: Android HW/SW toggle (Platform auto / WebRTC APM)
- VoiceStatusChip: mute warning border + Speaker muted label
- BBCode welcome message parser (BbCodeText, case-insensitive)
- Welcome message foldable (expanded by default)
- Link trust dialog (domain wildcards, SharedPreferences)
- HapticFeedback on voice sheet opener
- Server name in AppBar, version v0.1.0
- Default channel (id=1) visible, serverquery clients hidden
- flutter_foreground_task integration

Config:
- ort load-dynamic on all non-iOS (Android/Linux/Windows)
- ONNX Runtime AAR 1.26.0
- ndarray moved to common deps (was Apple-only)

apps/chanora_flutter/lib/main.dart

@@ -18,6 +18,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:path_provider/path_provider.dart';
+import 'package:flutter_foreground_task/flutter_foreground_task.dart';
 
 import 'l10n/generated/app_localizations.dart';
 import 'services/android_permissions_service.dart';
@@ -30,6 +31,8 @@ import 'widgets/voice_platform.dart';
 import 'widgets/voice_bar.dart';
 import 'widgets/voice_compact.dart';
 import 'widgets/voice_settings.dart';
+import 'widgets/bbcode_text.dart';
+import 'services/link_trust_service.dart';
 
 bool get _isMacOS => !kIsWeb && Platform.isMacOS;
 
@@ -62,11 +65,12 @@ Future<void> _configureBundledVadModels() async {
     assetPath: _sileroVadAsset,
     fileName: 'silero_vad.onnx',
   );
-  await _copyBundledAssetToDocuments(
+  final ten = await _copyBundledAssetToDocuments(
     assetPath: _tenVadAsset,
     fileName: 'ten_vad.onnx',
   );
   await rust.setVadModelPath(path: silero.path);
+  await rust.setTenVadModelPath(path: ten.path);
 }
 
 /// Top padding for macOS to clear traffic-light buttons.
@@ -136,7 +140,7 @@ String? _pttDisplayLabelForKey(LogicalKeyboardKey k) {
 /// pubspec.yaml advances (e.g. rc.8 -> rc.9 -> 1.0.0). The
 /// build-counter suffix changes automatically on every pubspec
 /// `+<n>` bump because Flutter writes it into Info.plist.
-const String _kSemverBaseline = 'v1.0.0-rc.8';
+const String _kSemverBaseline = 'v0.1.0';
 String _kAppVersion = _kSemverBaseline;
 
 Future<void> main() async {
@@ -146,6 +150,8 @@ Future<void> main() async {
   unawaited(_wireStorage());
   unawaited(_wireConnectivity());
   _wireIosAudioLifecycle();
+  _wireAndroidAudioLifecycle();
+  await _configureBundledVadModels();
   runApp(const ChanoraApp());
 }
 
@@ -214,6 +220,37 @@ void _wireIosAudioLifecycle() {
   });
 }
 
+/// Wire the Android audio lifecycle MethodChannel.
+///
+/// Kotlin side (`AndroidAudioLifecycleController`) posts route-change
+/// events through `FlutterMethodChannel` named
+/// `"chanora/android_audio_lifecycle"`. This handler dispatches them to
+/// the FRB bridge functions on the Rust side, mirroring the iOS pattern.
+void _wireAndroidAudioLifecycle() {
+  if (!Platform.isAndroid) return;
+  const channel = MethodChannel('chanora/android_audio_lifecycle');
+  channel.setMethodCallHandler((call) async {
+    try {
+      switch (call.method) {
+        case 'handleRouteChange':
+          final args = call.arguments;
+          final routeStr = args is Map
+              ? (args['routeType'] as String? ?? 'Unknown')
+              : (args as String? ?? 'Unknown');
+          final route = _parseBridgeAudioRoute(routeStr);
+          rust.handleRouteChange(route: route);
+          break;
+        default:
+          // Unknown method — ignore gracefully rather than crashing.
+          break;
+      }
+    } catch (_) {
+      // Errors from the Rust side are already logged there;
+      // don't propagate exceptions to the Android framework.
+    }
+  });
+}
+
 /// Populate `_kAppVersion` by suffixing the platform-canonical
 /// build number to `_kSemverBaseline`. Format:
 /// `v1.0.0-rc.8+<build>` (e.g. `v1.0.0-rc.8+64`). The build
@@ -728,6 +765,15 @@ class _BetaHomeState extends State<_BetaHome> {
         _phase = _Phase.connected;
         _applySnapshot(snap);
       });
+      try {
+        await FlutterForegroundTask.startService(
+          notificationTitle: 'Chanora',
+          notificationText: 'Connected to ${snap.serverName}',
+          notificationButtons: const [
+            NotificationButton(id: 'disconnect', text: 'Disconnect'),
+          ],
+        );
+      } catch (_) {}
     } catch (e) {
       if (!mounted) return;
       final errorStr = e.toString();
@@ -1186,6 +1232,9 @@ class _BetaHomeState extends State<_BetaHome> {
     try {
       await rust.disconnect();
     } catch (_) {}
+    try {
+      await FlutterForegroundTask.stopService();
+    } catch (_) {}
     if (!mounted) return;
     setState(() {
       _phase = _Phase.idle;
@@ -1506,6 +1555,7 @@ class _BetaHomeState extends State<_BetaHome> {
           icon: Icon(_hardMute ? Icons.mic_off : Icons.mic),
           isSelected: _hardMute,
           selectedIcon: const Icon(Icons.mic_off),
+          color: _hardMute ? theme.colorScheme.error : null,
           onPressed: _onToggleHardMute,
         ),
         IconButton(
@@ -1513,6 +1563,7 @@ class _BetaHomeState extends State<_BetaHome> {
           icon: Icon(_outputMuted ? Icons.headset_off : Icons.headset),
           isSelected: _outputMuted,
           selectedIcon: const Icon(Icons.headset_off),
+          color: _outputMuted ? theme.colorScheme.error : null,
           onPressed: _toggleOutputMute,
         ),
       ],
@@ -1532,6 +1583,10 @@ class _BetaHomeState extends State<_BetaHome> {
 
     const headerTitle = SizedBox.shrink();
 
+    final appBarTitle = _phase == _Phase.connected
+        ? Text(_snapshot?.serverName ?? l10n.appTitle, style: theme.textTheme.titleMedium)
+        : headerTitle;
+
     final bodyContent = LayoutBuilder(
       builder: (ctx, bodyConstraints) {
         const wideBreakpoint = 600.0;
@@ -1554,7 +1609,8 @@ class _BetaHomeState extends State<_BetaHome> {
           crossAxisAlignment: CrossAxisAlignment.stretch,
           children: [
             if (!isWideSnapshot) ...[banner, const SizedBox(height: 12)],
-            Text(statusText(), style: theme.textTheme.titleMedium),
+            if (_phase != _Phase.connected)
+              Text(statusText(), style: theme.textTheme.titleMedium),
             if (_lostReason != null || _reconnectAttempt != null) ...[
               const SizedBox(height: 8),
               Container(
@@ -1707,6 +1763,8 @@ class _BetaHomeState extends State<_BetaHome> {
                           pttBoundKeyLabel: _pttBoundKeyLabel,
                           audioStats: _audioStats,
                           isTouchOnly: isTouchOnlyPttHost,
+                          inputMuted: _hardMute,
+                          outputMuted: _outputMuted,
                           onTap: () => _onOpenVoiceDetailsSheet(),
                         ),
                         if (_inChannel &&
@@ -1756,7 +1814,7 @@ class _BetaHomeState extends State<_BetaHome> {
     }
 
     return Scaffold(
-      appBar: AppBar(title: headerTitle, actions: headerActions),
+      appBar: AppBar(title: appBarTitle, actions: headerActions),
       body: SafeArea(
         top: false,
         child: Padding(padding: const EdgeInsets.all(16), child: bodyContent),
@@ -2168,6 +2226,75 @@ class _BookmarkList extends StatelessWidget {
 ///
 /// Driven by the `BridgeEvent::PttCapability` stream published by
 /// the `PttController` (SDD-088). The `_BetaHomeState` listener
+class _WelcomeMessageTile extends StatefulWidget {
+  const _WelcomeMessageTile({required this.welcomeMessage});
+
+  final String welcomeMessage;
+
+  @override
+  State<_WelcomeMessageTile> createState() => _WelcomeMessageTileState();
+}
+
+class _WelcomeMessageTileState extends State<_WelcomeMessageTile> {
+  bool _expanded = true;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Container(
+      decoration: BoxDecoration(
+        color: theme.colorScheme.surfaceContainerHighest,
+        borderRadius: BorderRadius.circular(6),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          InkWell(
+            onTap: () {
+              HapticFeedback.selectionClick();
+              setState(() => _expanded = !_expanded);
+            },
+            borderRadius: const BorderRadius.vertical(top: Radius.circular(6)),
+            child: Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
+              child: Row(
+                children: [
+                  Icon(
+                    _expanded ? Icons.expand_less : Icons.expand_more,
+                    size: 18,
+                    color: theme.colorScheme.onSurfaceVariant,
+                  ),
+                  const SizedBox(width: 4),
+                  Text(
+                    'Server welcome message',
+                    style: theme.textTheme.labelMedium?.copyWith(
+                      color: theme.colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+          AnimatedCrossFade(
+            firstChild: Padding(
+              padding: const EdgeInsets.fromLTRB(8, 0, 8, 8),
+              child: BbCodeText(
+                widget.welcomeMessage,
+                linkTrust: LinkTrustService.instance,
+              ),
+            ),
+            secondChild: const SizedBox(width: double.infinity),
+            crossFadeState: _expanded
+                ? CrossFadeState.showFirst
+                : CrossFadeState.showSecond,
+            duration: const Duration(milliseconds: 200),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
 /// updates the props on each transition.
 class _SnapshotView extends StatelessWidget {
   const _SnapshotView({
@@ -2242,17 +2369,7 @@ class _SnapshotView extends StatelessWidget {
         ),
         if (snapshot.welcomeMessage.isNotEmpty) ...[
           const SizedBox(height: 8),
-          Container(
-            padding: const EdgeInsets.all(8),
-            decoration: BoxDecoration(
-              color: theme.colorScheme.surfaceContainerHighest,
-              borderRadius: BorderRadius.circular(6),
-            ),
-            child: Text(
-              snapshot.welcomeMessage,
-              style: theme.textTheme.bodySmall,
-            ),
-          ),
+          _WelcomeMessageTile(welcomeMessage: snapshot.welcomeMessage),
         ],
         const Divider(height: 24),
         Text(l10n.channelsHeading, style: theme.textTheme.titleMedium),
@@ -2271,7 +2388,6 @@ class _SnapshotView extends StatelessWidget {
                     : null,
               ),
               title: Text(ch.name),
-              subtitle: Text('id=${ch.id}  parent=${ch.parent}'),
               selected: ch.id == currentVoiceChannelId,
               onTap:
                   hasJoinPending ||
@@ -2284,7 +2400,8 @@ class _SnapshotView extends StatelessWidget {
             ),
           ),
           for (final cl in byChannel[ch.id] ?? const <rust.BridgeClient>[])
-            _clientTile(theme, cl, (depthById[ch.id] ?? 0) * indentPerLevel),
+            if (!cl.isServerQuery)
+              _clientTile(theme, cl, (depthById[ch.id] ?? 0) * indentPerLevel),
         ],
       ],
     );