refactored direct chat logic into a shared utility, implemented direct message shortcuts in the participant list and message reactions, and added reaction visibility checks in the message options dialog

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

@@ -10,13 +10,13 @@ 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';
+import '../data/open_direct_chat.dart';
 
 const _commonReactions = <String>['👍', '👎', '😆', '❤️', '👀'];
 
@@ -40,6 +40,7 @@ void showChatMessageOptionsDialog(
   final parentContext = context;
   final canReact =
       bubbleData.messageType == GetRoomResponseObjectMessageType.comment;
+  final hasReactions = bubbleData.reactions?.isNotEmpty ?? false;
   final canDelete =
       isSender &&
       DateTime.fromMillisecondsSinceEpoch(
@@ -66,7 +67,7 @@ void showChatMessageOptionsDialog(
             Navigator.of(sheetCtx).pop();
           },
         ),
-      if (canReact)
+      if (canReact && hasReactions)
         ListTile(
           leading: const Icon(Icons.emoji_emotions_outlined),
           title: const Text('Reaktionen'),
@@ -129,7 +130,7 @@ void showChatMessageOptionsDialog(
           onTap: () {
             Navigator.of(sheetCtx).pop();
             if (!parentContext.mounted) return;
-            _openOrCreateDirectChat(
+            openOrCreateDirectChat(
               parentContext,
               actorId: bubbleData.actorId,
               actorDisplayName: bubbleData.actorDisplayName,
@@ -160,62 +161,6 @@ 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 previous ChatView first — otherwise it stays in the
-    // back-stack with a now-mismatched currentToken and renders empty
-    // on back-swipe. Stop at popups so an open dialog stays alive.
-    Navigator.of(
-      context,
-    ).popUntil((route) => route.isFirst || route is PopupRoute);
-    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;