fix: restore offline queue for captures, drain via chat on retry

Offline queue (SharedPreferences) persists captures when the device
is offline and replays them as chat conversations on next launch,
preserving the same fire-and-forget guarantee as the online path.

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

lib/app.dart

@@ -8,6 +8,8 @@ import 'core/constants.dart';
 import 'core/theme.dart';
 import 'providers/api_client_provider.dart';
 import 'providers/auth_provider.dart';
+import 'core/exceptions.dart';
+import 'providers/capture_queue_provider.dart';
 import 'providers/capture_work_queue_provider.dart';
 import 'providers/briefing_provider.dart';
 import 'providers/calendar_provider.dart';
@@ -512,6 +514,12 @@ class _QuickCaptureBar extends ConsumerStatefulWidget {
 class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
   final _controller = TextEditingController();
 
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) => _drainOfflineQueue());
+  }
+
   @override
   void dispose() {
     _controller.dispose();
@@ -527,6 +535,28 @@ class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
     ref.read(captureWorkQueueProvider.notifier).enqueue(text);
   }
 
+  Future<void> _drainOfflineQueue() async {
+    if (!mounted) return;
+    final queue = ref.read(captureQueueProvider);
+    if (queue.isEmpty) return;
+    for (final text in List<String>.from(queue)) {
+      if (!mounted) break;
+      try {
+        final conv =
+            await ref.read(conversationsProvider.notifier).create('');
+        final chatRepo = ref.read(chatRepositoryProvider);
+        await chatRepo.sendMessage(conv.id, text);
+        chatRepo.streamGeneration(conv.id).drain<void>().ignore();
+        await ref.read(captureQueueProvider.notifier).dequeue(text);
+      } on NetworkException {
+        break;
+      } catch (_) {
+        // Server error — drop from queue to prevent ghost items.
+        await ref.read(captureQueueProvider.notifier).dequeue(text);
+      }
+    }
+  }
+
   Future<void> _toggleCaptureMic() async {
     final voice = ref.read(voiceProvider);
     if (voice.voiceModeActive) {
@@ -556,8 +586,10 @@ class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
   @override
   Widget build(BuildContext context) {
     final location = GoRouterState.of(context).matchedLocation;
+    final offlineQueueCount = ref.watch(captureQueueProvider).length;
     final workQueue = ref.watch(captureWorkQueueProvider);
     final isWorking = workQueue.isNotEmpty;
+    final totalPending = workQueue.length + offlineQueueCount;
 
     // Show snackbar when a result is published.
     ref.listen(captureResultProvider, (_, result) {
@@ -592,7 +624,12 @@ class _QuickCaptureBarState extends ConsumerState<_QuickCaptureBar> {
                       isDense: true,
                       contentPadding: const EdgeInsets.symmetric(
                           horizontal: 14, vertical: 10),
-                      prefixIcon: isWorking
+                      prefixIcon: totalPending > 0
+                          ? Badge(
+                              label: Text('$totalPending'),
+                              child: const Icon(Icons.cloud_upload_outlined),
+                            )
+                          : isWorking
                               ? const Padding(
                                   padding: EdgeInsets.all(12),
                                   child: SizedBox(

lib/providers/capture_work_queue_provider.dart

@@ -2,6 +2,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../core/exceptions.dart';
 import 'api_client_provider.dart';
+import 'capture_queue_provider.dart';
 import 'chat_provider.dart';
 
 /// Outcome of a single capture attempt — consumed by the UI for snackbars.
@@ -63,11 +64,13 @@ class CaptureWorkQueueNotifier extends Notifier<List<String>> {
           ref.read(captureResultProvider.notifier).state =
               const CaptureResult('Sent to Fabled.');
         } on NetworkException catch (_) {
+          // Persist to offline queue and stop draining — still offline.
+          await ref.read(captureQueueProvider.notifier).enqueue(text);
           state = state.length > 1 ? state.sublist(1) : [];
           ref.read(captureResultProvider.notifier).state = const CaptureResult(
-            "You're offline — message not sent.",
+            "You're offline — capture saved and will retry automatically.",
-            isError: true,
           );
+          break;
         } on AppException catch (e) {
           state = state.length > 1 ? state.sublist(1) : [];
           ref.read(captureResultProvider.notifier).state =