implemented message forwarding and direct chat creation from group members, and added specialized share picker for forwarded content

lib/view/pages/share_intent/share_chat_picker.dart

@@ -7,6 +7,8 @@ import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';
 
 import '../../../api/errors/error_mapper.dart';
 import '../../../api/marianumcloud/talk/room/get_room_response.dart';
+import '../../../api/marianumcloud/talk/send_message/send_message.dart';
+import '../../../api/marianumcloud/talk/send_message/send_message_params.dart';
 import '../../../api/marianumcloud/talk/share_files_to_chat.dart';
 import '../../../api/marianumcloud/webdav/webdav_api.dart';
 import '../../../routing/app_routes.dart';
@@ -47,6 +49,23 @@ class ShareChatPicker extends StatelessWidget {
         onPicked: (ctx, room) => _internalShareFlow(ctx, room, file),
       );
 
+  /// Forward an existing Talk message (text and/or already-uploaded file
+  /// attachment) into another chat. The attachment is re-shared via the same
+  /// FileSharingApi path used for [forInternalShare]; plain text is posted
+  /// with [SendMessage].
+  factory ShareChatPicker.forMessageForward({
+    String? text,
+    RemoteFileRef? file,
+  }) {
+    assert(
+      text != null || file != null,
+      'forMessageForward requires either text or file',
+    );
+    return ShareChatPicker._(
+      onPicked: (ctx, room) => _forwardMessageFlow(ctx, room, text, file),
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     final talkSettings = context.watch<SettingsCubit>().val().talkSettings;
@@ -217,6 +236,39 @@ Future<void> _internalShareFlow(
   _finishWithChat(context, room);
 }
 
+Future<void> _forwardMessageFlow(
+  BuildContext context,
+  GetRoomResponseObject room,
+  String? text,
+  RemoteFileRef? file,
+) async {
+  unawaited(_showBlockingSpinner(context));
+  try {
+    if (file != null) {
+      await shareFilesToChat(
+        token: room.token,
+        remoteFilePaths: [file.path],
+      );
+    }
+    if (text != null && text.isNotEmpty) {
+      await SendMessage(room.token, SendMessageParams(text)).run();
+    }
+  } catch (e) {
+    if (context.mounted) Navigator.of(context).pop();
+    if (context.mounted) {
+      InfoDialog.show(
+        context,
+        errorToUserMessage(e),
+        title: 'Fehler',
+        copyable: true,
+      );
+    }
+    return;
+  }
+  if (!context.mounted) return;
+  _finishWithChat(context, room);
+}
+
 /// Modal progress overlay shown during share-API roundtrips. The dialog is
 /// popped together with the picker by the subsequent popUntil(isFirst).
 Future<void> _showBlockingSpinner(BuildContext context) => showDialog<void>(

lib/view/pages/talk/widgets/chat_message_options_dialog.dart

@@ -1,5 +1,4 @@
 import 'package:emoji_picker_flutter/emoji_picker_flutter.dart' as emojis;
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
@@ -11,9 +10,11 @@ import '../../../../api/marianumcloud/talk/room/get_room_response.dart';
 import '../../../../routing/app_routes.dart';
 import '../../../../share_intent/remote_file_ref.dart';
 import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
+import '../../../../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import '../../../../utils/clipboard_helper.dart';
 import '../../../../widget/app_progress_indicator.dart';
 import '../../../../widget/async_action_button.dart';
+import '../../../../widget/confirm_dialog.dart';
 import '../../../../widget/debug/debug_tile.dart';
 import '../../../../widget/details_bottom_sheet.dart';
 
@@ -104,13 +105,39 @@ void showChatMessageOptionsDialog(
             );
           },
         ),
-      if (!kReleaseMode &&
+      if (canReact && (bubbleData.message != '{file}' || attachedFile != null))
+        ListTile(
+          leading: const Icon(Icons.forward_outlined),
+          title: const Text('Weiterleiten'),
+          onTap: () {
+            Navigator.of(sheetCtx).pop();
+            if (!parentContext.mounted) return;
+            AppRoutes.openForwardMessageToChat(
+              parentContext,
+              text: bubbleData.message == '{file}' ? null : bubbleData.message,
+              file: attachedFile != null
+                  ? RemoteFileRef.fromTalk(attachedFile)
+                  : null,
+            );
+          },
+        ),
+      if (canReact &&
           !isSender &&
-          chatData.type != GetRoomResponseObjectConversationType.oneToOne)
+          chatData.type != GetRoomResponseObjectConversationType.oneToOne &&
+          bubbleData.actorType ==
+              GetRoomResponseObjectMessageActorType.user)
         ListTile(
           leading: const Icon(Icons.sms_outlined),
-          title: Text("Private Nachricht an '${bubbleData.actorDisplayName}'"),
-          onTap: () => Navigator.of(sheetCtx).pop(),
+          title: Text('Private Nachricht an ${bubbleData.actorDisplayName}'),
+          onTap: () {
+            Navigator.of(sheetCtx).pop();
+            if (!parentContext.mounted) return;
+            _openOrCreateDirectChat(
+              parentContext,
+              actorId: bubbleData.actorId,
+              actorDisplayName: bubbleData.actorDisplayName,
+            );
+          },
         ),
       if (canDelete)
         AsyncListTile(
@@ -126,6 +153,60 @@ void showChatMessageOptionsDialog(
   );
 }
 
+void _openOrCreateDirectChat(
+  BuildContext context, {
+  required String actorId,
+  required String actorDisplayName,
+}) {
+  final chatListBloc = context.read<ChatListBloc>();
+
+  GetRoomResponseObject? findExisting() {
+    final rooms = chatListBloc.state.data?.rooms;
+    if (rooms == null) return null;
+    for (final room in rooms.data) {
+      if (room.type == GetRoomResponseObjectConversationType.oneToOne &&
+          room.name == actorId) {
+        return room;
+      }
+    }
+    return null;
+  }
+
+  void switchToChat(GetRoomResponseObject room) {
+    // Pop the current ChatView before swapping the global ChatBloc token —
+    // otherwise the previous group chat stays mounted in the back-stack and
+    // would render empty after a back-swipe (currentToken no longer matches).
+    Navigator.of(context).popUntil((route) => route.isFirst);
+    AppRoutes.openChatByToken(context, room.token);
+  }
+
+  final existing = findExisting();
+  if (existing != null) {
+    switchToChat(existing);
+    return;
+  }
+
+  ConfirmDialog(
+    title: 'Privatchat starten?',
+    content:
+        'Es existiert noch kein Privatchat mit $actorDisplayName. '
+        'Soll einer erstellt werden?',
+    confirmButton: 'Erstellen',
+    onConfirmAsync: () async {
+      await chatListBloc.createDirectChat(actorId);
+      final created = findExisting();
+      if (created == null) {
+        throw Exception(
+          'Privatchat konnte nach dem Erstellen nicht gefunden werden.',
+        );
+      }
+      if (context.mounted) {
+        switchToChat(created);
+      }
+    },
+  ).asDialog(context);
+}
+
 class _ReactionsRow extends StatefulWidget {
   final String chatToken;
   final int messageId;