feat(voice): integrate one-shot voice capture into Quick Capture bar

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/app.dart

@@ -29,6 +29,8 @@ import 'screens/settings/settings_screen.dart';
 import 'screens/setup/setup_screen.dart';
 import 'screens/splash/splash_screen.dart';
 import 'screens/tasks/task_edit_screen.dart';
+import 'providers/voice_provider.dart';
+import 'widgets/voice_mic_button.dart';
 
 // ChangeNotifier that fires when auth or server URL changes,
 // used as GoRouter.refreshListenable so the router re-evaluates redirects
@@ -399,6 +401,7 @@ class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
   @override
   void dispose() {
     _controller.dispose();
+    ref.read(voiceProvider.notifier).exitVoiceMode();
     super.dispose();
   }
 
@@ -440,6 +443,25 @@ class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
     }
   }
 
+  Future<void> _toggleCaptureMic() async {
+    final voice = ref.read(voiceProvider);
+    if (voice.voiceModeActive) {
+      ref.read(voiceProvider.notifier).exitVoiceMode();
+      return;
+    }
+    await ref.read(voiceProvider.notifier).enterVoiceMode(
+      onTranscript: (transcript) async {
+        ref.read(captureWorkQueueProvider.notifier).enqueue(transcript);
+      },
+      enableTts: false,
+      onError: (msg) {
+        if (!mounted) return;
+        ScaffoldMessenger.of(context)
+            .showSnackBar(SnackBar(content: Text(msg)));
+      },
+    );
+  }
+
   String _hintForLocation(String location) {
     if (location.startsWith(Routes.knowledge)) return 'Capture a note…';
     if (location.startsWith(Routes.projects)) return 'Capture a note…';
@@ -482,7 +504,9 @@ class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
                     onSubmitted: (_) => _submit(),
                     onChanged: (_) => setState(() {}),
                     decoration: InputDecoration(
-                      hintText: _hintForLocation(location),
+                      hintText: ref.watch(voiceProvider).voiceModeActive
+                          ? 'Listening…'
+                          : _hintForLocation(location),
                       isDense: true,
                       contentPadding: const EdgeInsets.symmetric(
                           horizontal: 14, vertical: 10),
@@ -512,6 +536,11 @@ class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
                     ),
                   ),
                 ),
+                VoiceMicButton(
+                  mode: ref.watch(voiceProvider).mode,
+                  voiceModeActive: ref.watch(voiceProvider).voiceModeActive,
+                  onTap: _toggleCaptureMic,
+                ),
                 IconButton(
                   icon: const Icon(Icons.settings_outlined),
                   tooltip: 'Settings',