Phase 3.3: topic sensitivity + Phase 3.4: auth foundation

Phase 3.3 — Session Topic Sensitivity (complete):
- Backend: topic_sensitivity column + session_sensitivity_log, sensitivity service
  (flip with one-way-latch + audit), PATCH /api/shared/chat/sessions/:id/topic,
  topic carried in pairing + extension WS payloads, CC filter + sensitive stats
  + per-mitra sensitive columns on activity page
- client_app: TopicSelectionBottomSheet before pricing, topic flows through
  pairing request, silent WS handler for session_topic_updated
- mitra_app: SensitivityBadge + SensitivityTheme + sensitivityConfigProvider,
  overlay badge + yellow accent, chat screen app-bar toggle with configurable
  confirmation + latch, extension card shows current flag, history + transcript
  yellow theme
- control_center: Sensitivitas Topik settings section, topic filter + column
  with inline audit log, sensitive stats dashboard card, mitra activity
  sensitive columns with QC flag

Phase 3.4 — Self-Managed Auth (foundation only):
- Migration: auth_sessions + otp_requests tables, social identity columns on
  customers, password_hash + lockout on control_center_users, OTP + CC lockout
  app_config keys
- New services: password (bcrypt + complexity), token (JWT HS256 + refresh
  rotation, session_id claim pre-wires future Valkey revocation),
  social-identity (Google + Apple JWKS), OTP (Fazpass stub — real API TBD)
- Constants: AuthProvider + OtpChannel
- Middleware, auth route rewrites, WS auth update, Firebase → FCM isolation
  still pending (next chunk); Fazpass docs + Apple Developer setup still
  required before E2E testing

Docs:
- requirement/phase3.3.md, phase3.3-plan.md, phase3.3-testing.md
- requirement/phase3.4.md, phase3.4-plan.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

client_app/lib/features/home/home_screen.dart

@@ -6,6 +6,7 @@ import '../../core/api/api_client_provider.dart';
 import '../../core/chat/unread_notifier.dart';
 import '../../core/pairing/pairing_notifier.dart';
 import '../chat/widgets/pricing_bottom_sheet.dart';
+import '../chat/widgets/topic_selection_bottom_sheet.dart';
 
 class HomeScreen extends ConsumerStatefulWidget {
   const HomeScreen({super.key});
@@ -60,6 +61,12 @@ class _HomeScreenState extends ConsumerState<HomeScreen> with WidgetsBindingObse
     }
   }
 
+  Future<void> _onStartChatPressed(BuildContext context) async {
+    final topic = await TopicSelectionBottomSheet.show(context);
+    if (topic == null || !context.mounted) return;
+    await PricingBottomSheet.show(context, topicSensitivity: topic);
+  }
+
   @override
   Widget build(BuildContext context) {
     final authState = ref.watch(authProvider);
@@ -122,7 +129,7 @@ class _HomeScreenState extends ConsumerState<HomeScreen> with WidgetsBindingObse
                     style: ElevatedButton.styleFrom(
                       padding: const EdgeInsets.symmetric(horizontal: 48, vertical: 16),
                     ),
-                    onPressed: () => PricingBottomSheet.show(context),
+                    onPressed: () => _onStartChatPressed(context),
                     child: const Text('Mulai Curhat', style: TextStyle(fontSize: 18)),
                   ),
                 ],