feat(phase17): account & identity management

lib/features/about/screens/about_screen.dart

@@ -32,6 +32,12 @@ class AboutScreen extends StatelessWidget {
             Clipboard.setData(
               const ClipboardData(text: 'https://mostro.network/docs'),
             );
+            ScaffoldMessenger.of(context).showSnackBar(
+              const SnackBar(
+                content: Text('Link copied to clipboard'),
+                duration: Duration(seconds: 2),
+              ),
+            );
           },
         ),
       ),
@@ -41,8 +47,8 @@ class AboutScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    final c = colors!;
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
+    final c = colors;
 
     return Scaffold(
       appBar: AppBar(

lib/features/account/providers/privacy_mode_provider.dart

@@ -0,0 +1,23 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+/// In-memory privacy mode flag.
+///
+/// Wraps `get_privacy_mode()` / `set_privacy_mode()` from the Rust reputation
+/// API.  UI reads and writes go through this provider so widgets can react
+/// to changes without polling.
+///
+/// TODO(bridge): initialise from `get_privacy_mode()` once the bridge is wired
+/// (Phase 18+).
+final privacyModeProvider = StateNotifierProvider<PrivacyModeNotifier, bool>(
+  (ref) => PrivacyModeNotifier(),
+);
+
+class PrivacyModeNotifier extends StateNotifier<bool> {
+  PrivacyModeNotifier() : super(false);
+
+  /// Set privacy mode to [enabled] and propagate to the Rust layer.
+  void setPrivacyMode(bool enabled) {
+    state = enabled;
+    // TODO(bridge): call set_privacy_mode(enabled) via FFI (Phase 18+).
+  }
+}

lib/features/account/screens/account_screen.dart

@@ -1,8 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
 
+import 'package:mostro/core/app_routes.dart';
 import 'package:mostro/core/app_theme.dart';
 import 'package:mostro/features/account/providers/backup_reminder_provider.dart';
+import 'package:mostro/features/account/providers/privacy_mode_provider.dart';
 
 /// Account screen — Route `/key_management`.
 ///
@@ -21,9 +24,6 @@ class _AccountScreenState extends ConsumerState<AccountScreen> {
   List<String>? _words;
   bool _loadingWords = false;
 
-  // Privacy mode — placeholder until settings provider is wired in Phase 6
-  bool _privacyMode = false;
-
   String _maskPhrase(List<String> words) {
     if (words.length < 4) return words.join(' ');
     final first = words.take(2).join(' ');
@@ -66,6 +66,7 @@ class _AccountScreenState extends ConsumerState<AccountScreen> {
     final cardBg = colors?.backgroundCard ?? const Color(0xFF1E2230);
     final inputBg = colors?.backgroundInput ?? const Color(0xFF252A3A);
     final textSec = colors?.textSecondary ?? const Color(0xFFB0B3C6);
+    final privacyMode = ref.watch(privacyModeProvider);
 
     return Scaffold(
       appBar: AppBar(
@@ -176,33 +177,29 @@ class _AccountScreenState extends ConsumerState<AccountScreen> {
                   style: theme.textTheme.bodySmall!.copyWith(color: textSec),
                 ),
                 const SizedBox(height: AppSpacing.md),
-                Opacity(
-                  opacity: 0.5,
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      _PrivacyOption(
-                        title: 'Reputation Mode',
-                        subtitle: 'Standard privacy with reputation',
-                        selected: !_privacyMode,
-                        green: green,
-                        onTap: null,
-                      ),
-                      const SizedBox(height: AppSpacing.sm),
-                      _PrivacyOption(
-                        title: 'Full Privacy Mode',
-                        subtitle: 'Maximum anonymity',
-                        selected: _privacyMode,
-                        green: green,
-                        onTap: null,
-                      ),
-                    ],
-                  ),
-                ),
-                const SizedBox(height: AppSpacing.sm),
-                Text(
-                  'Coming soon',
-                  style: theme.textTheme.bodySmall!.copyWith(color: textSec),
+                Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    _PrivacyOption(
+                      title: 'Reputation Mode',
+                      subtitle: 'Standard privacy with reputation',
+                      selected: !privacyMode,
+                      green: green,
+                      onTap: () => ref
+                          .read(privacyModeProvider.notifier)
+                          .setPrivacyMode(false),
+                    ),
+                    const SizedBox(height: AppSpacing.sm),
+                    _PrivacyOption(
+                      title: 'Full Privacy Mode',
+                      subtitle: 'Maximum anonymity',
+                      selected: privacyMode,
+                      green: green,
+                      onTap: () => ref
+                          .read(privacyModeProvider.notifier)
+                          .setPrivacyMode(true),
+                    ),
+                  ],
                 ),
               ],
             ),
@@ -286,18 +283,23 @@ class _AccountScreenState extends ConsumerState<AccountScreen> {
       builder: (_) => AlertDialog(
         title: const Text('Generate New User?'),
         content: const Text(
-          'This will permanently replace your current identity. '
-          'Make sure you have backed up your current secret words.',
+          'This will create a brand-new identity. Your current secret words '
+          'will no longer work — make sure they are backed up before continuing.',
         ),
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(context),
             child: const Text('Cancel'),
           ),
           FilledButton(
-            onPressed: () {
+            onPressed: () async {
               Navigator.pop(context);
-              // TODO: wire to create_identity() Rust bridge in Phase 5.
+              // TODO(bridge): call create_identity() via FFI (Phase 18+).
+              await ref
+                  .read(backupReminderProvider.notifier)
+                  .showBackupReminder();
+              if (!context.mounted) return;
+              context.go(AppRoute.walkthrough);
             },
             child: const Text('Continue'),
           ),

lib/features/chat/screens/chat_room_screen.dart

@@ -130,8 +130,7 @@ class _ChatRoomScreenState extends ConsumerState<ChatRoomScreen> {
 
     final room = _resolveRoom();
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
 
     return Scaffold(
       // Keyboard avoidance is handled manually via viewInsets.bottom padding
@@ -227,8 +226,7 @@ class _AppBarTitle extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     return Column(

lib/features/chat/screens/chat_rooms_screen.dart

@@ -18,8 +18,7 @@ class ChatRoomsScreen extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     return DefaultTabController(

lib/features/chat/widgets/chat_list_item.dart

@@ -23,8 +23,7 @@ class ChatListItem extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     final contextLine = room.isSelling

lib/features/chat/widgets/encrypted_file_message.dart

@@ -31,8 +31,7 @@ class _EncryptedFileMessageState extends State<EncryptedFileMessage> {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     final icon = _iconForMime(widget.mimeType);

lib/features/chat/widgets/encrypted_image_message.dart

@@ -19,8 +19,7 @@ class EncryptedImageMessage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     return GestureDetector(

lib/features/chat/widgets/info_panels.dart

@@ -33,8 +33,7 @@ class TradeInformationTab extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     return Card(
@@ -135,8 +134,7 @@ class UserInformationTab extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     return Card(

lib/features/chat/widgets/message_bubble.dart

@@ -78,8 +78,7 @@ class MessageBubble extends StatelessWidget {
     }
 
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     final isMine = message.isMine;
@@ -202,8 +201,7 @@ class _SystemMessage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     return Padding(

lib/features/chat/widgets/message_input.dart

@@ -46,8 +46,7 @@ class _MessageInputState extends State<MessageInput> {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
 
     return Container(
       decoration: BoxDecoration(

lib/features/disputes/screens/dispute_chat_screen.dart

@@ -67,8 +67,7 @@ class _DisputeChatScreenState extends ConsumerState<DisputeChatScreen> {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
 
     final dispute = ref.watch(disputeByIdProvider(widget.disputeId));
 

lib/features/disputes/widgets/dispute_list_item.dart

@@ -21,8 +21,7 @@ class DisputeListItem extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final textTheme = Theme.of(context).textTheme;
 
     final (statusBg, statusFg, statusLabel) = _statusChip(dispute.status);

lib/features/disputes/widgets/dispute_message_input.dart

@@ -50,8 +50,7 @@ class _DisputeMessageInputState extends State<DisputeMessageInput> {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
     final l10n = AppLocalizations.of(context);
 
     return Container(

lib/features/disputes/widgets/dispute_messages_list.dart

@@ -64,8 +64,7 @@ class _DisputeMessagesListState extends State<DisputeMessagesList> {
   @override
   Widget build(BuildContext context) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
 
     // Deduplicate by nostrEventId where present.
     final seen = <String>{};

lib/features/disputes/widgets/disputes_list.dart

@@ -21,8 +21,7 @@ class DisputesList extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final colors = Theme.of(context).extension<AppColors>();
-    assert(colors != null, 'AppColors theme extension must be registered');
-    if (colors == null) return const SizedBox.shrink();
+    if (colors == null) throw StateError('AppColors theme extension must be registered');
 
     final disputesAsync = ref.watch(userDisputeDataProvider);
 

lib/features/notifications/providers/notifications_provider.dart

@@ -35,6 +35,11 @@ class SembastNotificationsStore {
         // lose all notifications on page reload (notificationsProviderWithDb
         // regresses to in-memory-only behavior).  Fix: add sembast_web, switch
         // to databaseFactoryWeb, remove the sembast_memory import.
+        debugPrint(
+          '[notifications] WARNING: Using in-memory DB on web — '
+          'notifications will not persist across reloads. '
+          'Add sembast_web to pubspec.yaml to fix.',
+        );
         db = await databaseFactoryMemory.openDatabase(_dbName);
       } else {
         final dir = await getApplicationDocumentsDirectory();