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/chat/data/chat_repository.dart

@@ -1,4 +1,4 @@
-// Version: 1.3.0 | Created: 2026-04-01 | Updated: 2026-04-10
+// Version: 1.4.0 | Created: 2026-04-01 | Updated: 2026-07-04
 // Chat repository — bridges Matrix SDK timeline to app domain models.
 // Phase 2 additions: sendFile, sendReaction, redactEvent, reply support.
 
@@ -73,6 +73,17 @@ class ChatRepository {
     await room.sendFileEvent(file);
   }
 
+  /// Replaces the body of an existing text message (m.replace edit).
+  Future<void> editMessage(
+    String roomId,
+    String eventId,
+    String newText,
+  ) async {
+    final room = _getRoom(roomId);
+    if (room == null) return;
+    await room.sendTextEvent(newText, editEventId: eventId);
+  }
+
   /// Sends an emoji reaction to [eventId].
   Future<void> sendReaction(String roomId, String eventId, String emoji) async {
     final room = _getRoom(roomId);

lib/features/chat/presentation/chat_controller.dart

@@ -1,4 +1,4 @@
-// Version: 1.1.0 | Created: 2026-04-01
+// Version: 1.2.0 | Created: 2026-04-01 | Updated: 2026-07-04
 // Riverpod providers for chat timeline, send, upload, react, reply.
 
 import 'package:matrix/matrix.dart' show MatrixFile;
@@ -84,6 +84,27 @@ class SendReaction extends _$SendReaction {
   }
 }
 
+/// Edits an existing text message.
+@riverpod
+class EditMessage extends _$EditMessage {
+  @override
+  bool build() => false;
+
+  Future<String?> edit(String roomId, String eventId, String newText) async {
+    state = true;
+    try {
+      await ref
+          .read(chatRepositoryProvider)
+          .editMessage(roomId, eventId, newText);
+      return null;
+    } on Exception catch (e) {
+      return e.toString();
+    } finally {
+      state = false;
+    }
+  }
+}
+
 /// Deletes (redacts) a message by eventId.
 @riverpod
 class DeleteMessage extends _$DeleteMessage {

lib/features/chat/presentation/chat_screen.dart

@@ -1,4 +1,4 @@
-// Version: 1.3.1 | Created: 2026-04-01 | Updated: 2026-07-03
+// Version: 1.4.0 | Created: 2026-04-01 | Updated: 2026-07-04
 // Full chat screen — timeline + input + typing indicators + read receipts
 // + long-press context menu (reply, react, copy, delete) + room options sheet.
 
@@ -217,6 +217,12 @@ class _MessageWithGestures extends ConsumerWidget {
             context,
           ).showSnackBar(const SnackBar(content: Text('Message copied.')));
         },
+        onEdit: message.isMine && message.body != null
+            ? () {
+                Navigator.pop(context);
+                _showEditDialog(context, ref);
+              }
+            : null,
         onDelete: message.isMine
             ? () async {
                 Navigator.pop(context);
@@ -229,6 +235,44 @@ class _MessageWithGestures extends ConsumerWidget {
     );
   }
 
+  void _showEditDialog(BuildContext context, WidgetRef ref) {
+    final controller = TextEditingController(text: message.body ?? '');
+    showDialog<void>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('Edit message'),
+        content: TextField(
+          controller: controller,
+          autofocus: true,
+          maxLines: null,
+          decoration: const InputDecoration(border: OutlineInputBorder()),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(ctx).pop(),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () async {
+              final newText = controller.text.trim();
+              Navigator.of(ctx).pop();
+              if (newText.isEmpty || newText == message.body) return;
+              final error = await ref
+                  .read(editMessageProvider.notifier)
+                  .edit(roomId, message.eventId, newText);
+              if (error != null && context.mounted) {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  SnackBar(content: Text('Edit failed: $error')),
+                );
+              }
+            },
+            child: const Text('Save'),
+          ),
+        ],
+      ),
+    );
+  }
+
   void _showEmojiPicker(BuildContext context, WidgetRef ref) {
     showModalBottomSheet<void>(
       context: context,
@@ -437,6 +481,7 @@ class _MessageContextMenu extends StatelessWidget {
     required this.onReply,
     required this.onReact,
     required this.onCopy,
+    this.onEdit,
     this.onDelete,
   });
 
@@ -445,6 +490,7 @@ class _MessageContextMenu extends StatelessWidget {
   final VoidCallback onReply;
   final VoidCallback onReact;
   final VoidCallback onCopy;
+  final VoidCallback? onEdit;
   final VoidCallback? onDelete;
 
   @override
@@ -469,6 +515,12 @@ class _MessageContextMenu extends StatelessWidget {
               title: const Text('Copy text'),
               onTap: onCopy,
             ),
+          if (onEdit != null)
+            ListTile(
+              leading: const Icon(Icons.edit_outlined),
+              title: const Text('Edit'),
+              onTap: onEdit,
+            ),
           if (onDelete != null)
             ListTile(
               leading: const Icon(Icons.delete_outline, color: Colors.red),