feat: encrypted-history prompt, incoming-call alerts, message edit, panic button (v1.7.0+11)

P1 key_restore_prompt: offer recovery-key restore right after login
P2 incoming calls: mount overlay in app.dart + detect MSC3401 call.member
   (Element X signalling) — calls were previously invisible
P3 message edit: editMessage/EditMessage + Edit dialog (reactions/delete
   were already wired)
P5 panic button: new feature/panic module — hold-to-send alert text +
   m.location to a configured room; alert sent before geolocation so a
   denied permission never blocks it

All verified end-to-end in headless Chromium against production build.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/features/profile/presentation/profile_screen.dart

@@ -1,4 +1,4 @@
-// Version: 1.4.1 | Created: 2026-04-01 | Updated: 2026-07-03
+// Version: 1.5.0 | Created: 2026-04-01 | Updated: 2026-07-04
 // Profile screen. Shows current user info and logout button.
 
 import 'package:flutter/material.dart';
@@ -10,6 +10,8 @@ import '../../../core/config/app_config.dart';
 import '../../../core/network/matrix_client.dart';
 import '../../../shared/utils/matrix_id.dart';
 import '../../../shared/widgets/matrix_avatar.dart';
+import '../../panic/data/panic_repository.dart';
+import '../../panic/presentation/panic_settings_dialog.dart';
 import 'key_restore_dialog.dart';
 import 'security_setup_dialog.dart';
 
@@ -147,6 +149,16 @@ class ProfileScreen extends ConsumerWidget {
             ),
           ],
         ),
+        ListTile(
+          leading: const Icon(Icons.emergency_share, color: Colors.red),
+          title: const Text('Emergency panic button'),
+          subtitle: Text(
+            ref.watch(panicRepositoryProvider).config != null
+                ? 'Armed. Hold the alert icon on the rooms screen to trigger.'
+                : 'Send your location and an alert to a room of your choice',
+          ),
+          onTap: () => showPanicSettingsDialog(context, ref),
+        ),
         const SizedBox(height: 16),
         const Divider(),
         const SizedBox(height: 16),