implemented comprehensive accessibility (A11y) support across the app

lib/state/app/infrastructure/loadable_state/view/loadable_state_error_bar.dart

@@ -107,16 +107,26 @@ class _LoadableStateErrorBarTextState extends State<LoadableStateErrorBarText> {
     var bloc = context.watch<LoadableStateBloc>();
     final foreground = bloc.connectionForegroundColor(context);
 
-    return Row(
+    // liveRegion, damit das Auftauchen des Offline-/Fehlerbanners angesagt wird;
-      mainAxisAlignment: MainAxisAlignment.center,
+    // Row-Semantik ausgeschlossen (Icon + Text) und Text über das explizite
-      children: [
+    // Label getragen, sonst liest der Screenreader ihn doppelt.
-        Icon(bloc.connectionIcon(), size: 14, color: foreground),
+    return Semantics(
-        const SizedBox(width: 10),
+      liveRegion: true,
-        Text(
+      container: true,
-          bloc.connectionText(lastUpdated: widget.lastUpdated),
+      label: bloc.connectionText(lastUpdated: widget.lastUpdated),
-          style: TextStyle(fontSize: 12, color: foreground),
+      child: ExcludeSemantics(
+        child: Row(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Icon(bloc.connectionIcon(), size: 14, color: foreground),
+            const SizedBox(width: 10),
+            Text(
+              bloc.connectionText(lastUpdated: widget.lastUpdated),
+              style: TextStyle(fontSize: 12, color: foreground),
+            ),
+          ],
         ),
-      ],
+      ),
     );
   }
 

lib/state/app/modules/app_modules.dart

@@ -248,6 +248,7 @@ class AppModule {
             mainAxisSize: MainAxisSize.min,
             children: [
               IconButton(
+                tooltip: isVisible ? 'Modul ausblenden' : 'Modul einblenden',
                 onPressed: onVisibleChange,
                 icon: Icon(
                   isVisible

lib/view/login/widgets/login_branding.dart

@@ -7,11 +7,14 @@ class LoginHeader extends StatelessWidget {
   Widget build(BuildContext context) => Column(
     children: [
       const SizedBox(height: 40),
-      Image.asset(
+      // Dekoratives Logo – der Schulname steht direkt darunter als Text.
-        'assets/logo/icon.png',
+      const ExcludeSemantics(
-        height: 110,
+        child: Image(
-        fit: BoxFit.contain,
+          image: AssetImage('assets/logo/icon.png'),
-        gaplessPlayback: true,
+          height: 110,
+          fit: BoxFit.contain,
+          gaplessPlayback: true,
+        ),
       ),
       const SizedBox(height: 20),
       const Text(

lib/view/pages/files/search/files_search_delegate.dart

@@ -33,6 +33,7 @@ class FilesSearchDelegate extends SearchDelegate<void> {
   @override
   Widget? buildLeading(BuildContext context) => IconButton(
     icon: const Icon(Icons.arrow_back),
+    tooltip: 'Zurück',
     onPressed: () => close(context, null),
   );
 

lib/view/pages/files/sharing/share_options_sheet.dart

@@ -239,6 +239,7 @@ class _ShareOptionsBodyState extends State<_ShareOptionsBody> {
               ),
               trailing: IconButton(
                 onPressed: () => copyToClipboard(context, _share.url!),
+                tooltip: 'Link kopieren',
                 icon: const Icon(Icons.copy_outlined),
               ),
             ),

lib/view/pages/files/sharing/sharee_picker_page.dart

@@ -127,6 +127,7 @@ class _ShareePickerPageState extends State<ShareePickerPage> {
                     ? null
                     : IconButton(
                         icon: const Icon(Icons.clear),
+                        tooltip: 'Leeren',
                         onPressed: () {
                           _searchController.clear();
                           _query = '';

lib/view/pages/foreign_timetable/element_picker_page.dart

@@ -166,6 +166,7 @@ class _ElementPickerPageState extends State<ElementPickerPage> {
                     ? null
                     : IconButton(
                         icon: const Icon(Icons.clear),
+                        tooltip: 'Leeren',
                         onPressed: () {
                           _searchController.clear();
                           setState(() => _query = '');

lib/view/pages/grade_averages/grade_averages_list_view.dart

@@ -35,6 +35,7 @@ class GradeAveragesListView extends StatelessWidget {
                   Text(getGradeDisplay(grade)),
                   const SizedBox(width: 30),
                   IconButton(
+                    tooltip: 'Note entfernen',
                     onPressed: () {
                       bloc.add(DecrementGrade(grade));
                     },
@@ -49,6 +50,7 @@ class GradeAveragesListView extends StatelessWidget {
                     ),
                   ),
                   IconButton(
+                    tooltip: 'Note hinzufügen',
                     onPressed: () {
                       bloc.add(IncrementGrade(grade));
                     },
@@ -64,6 +66,7 @@ class GradeAveragesListView extends StatelessWidget {
               maintainSize: true,
               visible: bloc.canDecrementOrDelete(grade),
               child: IconButton(
+                tooltip: 'Löschen',
                 icon: const Icon(Icons.delete),
                 onPressed: () {
                   bloc.add(ResetGrade(grade));

lib/view/pages/grade_averages/grade_averages_view.dart

@@ -24,6 +24,7 @@ class GradeAveragesView extends StatelessWidget {
               Visibility(
                 visible: bloc.state.grades.isNotEmpty,
                 child: IconButton(
+                  tooltip: 'Alle zurücksetzen',
                   onPressed: () => ConfirmDialog(
                     title: 'Zurücksetzen?',
                     content: 'Alle Einträge werden entfernt.',

lib/view/pages/holidays/holidays_view.dart

@@ -38,6 +38,7 @@ class HolidaysView extends StatelessWidget {
           title: const Text('Schulferien'),
           actions: [
             IconButton(
+              tooltip: 'Informationen',
               icon: const Icon(Icons.info_outline),
               onPressed: showDisclaimer,
             ),

lib/view/pages/marianum_dates/marianum_dates_view.dart

@@ -68,6 +68,7 @@ class MarianumDatesView extends StatelessWidget {
                 onSelected: (e) => bloc.add(SetPastEventsVisible(e)),
               ),
               IconButton(
+                tooltip: 'Suchen',
                 icon: const Icon(Icons.search),
                 onPressed: () {
                   final events = bloc.getEvents() ?? const <MarianumDate>[];

lib/view/pages/marianum_dates/search_marianum_dates.dart

@@ -22,11 +22,16 @@ class SearchMarianumDates extends SearchDelegate<MarianumDate?> {
   @override
   List<Widget>? buildActions(BuildContext context) => [
     if (query.isNotEmpty)
-      IconButton(onPressed: () => query = '', icon: const Icon(Icons.clear)),
+      IconButton(
+        tooltip: 'Leeren',
+        onPressed: () => query = '',
+        icon: const Icon(Icons.clear),
+      ),
   ];
 
   @override
   Widget? buildLeading(BuildContext context) => IconButton(
+    tooltip: 'Zurück',
     icon: const Icon(Icons.arrow_back),
     onPressed: () => close(context, null),
   );

lib/view/pages/marianum_message/marianum_message_list_view.dart

@@ -22,6 +22,7 @@ class MarianumMessageListView extends StatelessWidget {
         title: const Text('Marianum Message'),
         actions: [
           IconButton(
+            tooltip: 'Suchen',
             icon: const Icon(Icons.search),
             onPressed: () {
               final list = bloc.state.data?.messageList;

lib/view/pages/marianum_message/search_marianum_messages.dart

@@ -23,11 +23,16 @@ class SearchMarianumMessages extends SearchDelegate<MarianumMessage?> {
   @override
   List<Widget>? buildActions(BuildContext context) => [
     if (query.isNotEmpty)
-      IconButton(onPressed: () => query = '', icon: const Icon(Icons.clear)),
+      IconButton(
+        tooltip: 'Leeren',
+        onPressed: () => query = '',
+        icon: const Icon(Icons.clear),
+      ),
   ];
 
   @override
   Widget? buildLeading(BuildContext context) => IconButton(
+    tooltip: 'Zurück',
     icon: const Icon(Icons.arrow_back),
     onPressed: () => close(context, null),
   );

lib/view/pages/more/roomplan/roomplan.dart

@@ -1,18 +1,24 @@
 import 'package:flutter/material.dart';
 import 'package:photo_view/photo_view.dart';
 
+import '../../../../widget/a11y/a11y_labels.dart';
+
 class Roomplan extends StatelessWidget {
   const Roomplan({super.key});
 
   @override
   Widget build(BuildContext context) => Scaffold(
     appBar: AppBar(title: const Text('Raumplan')),
-    body: PhotoView(
+    body: Semantics(
-      imageProvider: Image.asset('assets/img/raumplan.png').image,
+      image: true,
-      minScale: 0.5,
+      label: A11yLabels.roomPlan,
-      maxScale: 2.0,
+      child: PhotoView(
-      backgroundDecoration: BoxDecoration(
+        imageProvider: Image.asset('assets/img/raumplan.png').image,
-        color: Theme.of(context).colorScheme.surface,
+        minScale: 0.5,
+        maxScale: 2.0,
+        backgroundDecoration: BoxDecoration(
+          color: Theme.of(context).colorScheme.surface,
+        ),
       ),
     ),
   );

lib/view/pages/overhang.dart

@@ -23,6 +23,7 @@ class _OverhangState extends State<Overhang> {
       title: const Text('Mehr'),
       actions: [
         IconButton(
+          tooltip: 'Einstellungen',
           onPressed: () => AppRoutes.openSettings(context),
           icon: const Icon(Icons.settings),
         ),

lib/view/pages/settings/modules_settings_page.dart

@@ -66,6 +66,7 @@ class ModuleSortBody extends StatelessWidget {
                   mainAxisSize: MainAxisSize.min,
                   children: [
                     IconButton(
+                      tooltip: 'Slot entfernen',
                       icon: const Icon(Icons.remove_circle_outline),
                       onPressed:
                           modulesSettings.fixedBottomBarSlots >
@@ -80,6 +81,7 @@ class ModuleSortBody extends StatelessWidget {
                     ),
                     Text('${modulesSettings.fixedBottomBarSlots}'),
                     IconButton(
+                      tooltip: 'Slot hinzufügen',
                       icon: const Icon(Icons.add_circle_outline),
                       onPressed:
                           modulesSettings.fixedBottomBarSlots <

lib/view/pages/settings/widgets/push_status_sheet.dart

@@ -277,13 +277,22 @@ class _PushStatusBodyState extends State<_PushStatusBody>
   Widget _stateIcon(PushCheck state, ThemeData theme) {
     switch (state) {
       case PushCheck.ok:
-        return const Icon(Icons.check_circle_outline, color: Colors.green);
+        return const Icon(
+          Icons.check_circle_outline,
+          color: Colors.green,
+          semanticLabel: 'In Ordnung',
+        );
       case PushCheck.fail:
-        return Icon(Icons.cancel_outlined, color: theme.colorScheme.error);
+        return Icon(
+          Icons.cancel_outlined,
+          color: theme.colorScheme.error,
+          semanticLabel: 'Fehler',
+        );
       case PushCheck.unknown:
         return Icon(
           Icons.remove_circle_outline,
           color: theme.colorScheme.onSurfaceVariant,
+          semanticLabel: 'Unbekannt',
         );
     }
   }

lib/view/pages/share_intent/share_chat_picker.dart

@@ -76,6 +76,7 @@ class ShareChatPicker extends StatelessWidget {
         actions: [
           Builder(
             builder: (ctx) => IconButton(
+              tooltip: 'Suchen',
               icon: const Icon(Icons.search),
               onPressed: () {
                 final rooms = ctx.read<ChatListBloc>().state.data?.rooms;

lib/view/pages/talk/chat_list.dart

@@ -85,6 +85,7 @@ class _ChatListViewState extends State<_ChatListView> {
             title: const Text('Talk'),
             actions: [
               IconButton(
+                tooltip: 'Suchen',
                 icon: const Icon(Icons.search),
                 onPressed: () {
                   final rooms = bloc.state.data?.rooms;

lib/view/pages/talk/join_chat.dart

@@ -27,7 +27,11 @@ class JoinChat extends SearchDelegate<String> {
         },
       ),
     if (query.isNotEmpty)
-      IconButton(onPressed: () => query = '', icon: const Icon(Icons.clear)),
+      IconButton(
+        tooltip: 'Leeren',
+        onPressed: () => query = '',
+        icon: const Icon(Icons.clear),
+      ),
   ];
 
   @override

lib/view/pages/talk/search_chat.dart

@@ -25,7 +25,11 @@ class SearchChat extends SearchDelegate<GetRoomResponseObject?> {
   @override
   List<Widget>? buildActions(BuildContext context) => [
     if (query.isNotEmpty)
-      IconButton(onPressed: () => query = '', icon: const Icon(Icons.clear)),
+      IconButton(
+        tooltip: 'Leeren',
+        onPressed: () => query = '',
+        icon: const Icon(Icons.clear),
+      ),
   ];
 
   @override

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

@@ -9,6 +9,7 @@ import '../../../../share_intent/remote_file_ref.dart';
 import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../../../../utils/downloads/download_job.dart';
 import '../../../../utils/haptics.dart';
+import '../../../../widget/a11y/a11y_labels.dart';
 import '../../../../widget/demo_restricted.dart';
 import '../../../../widget/downloads/download_trigger.dart';
 import '../data/chat_bubble_styles.dart';
@@ -120,9 +121,7 @@ class _ChatBubbleState extends State<ChatBubble>
     if (!_rendersAsCommentBubble) {
       base = styles.getSystemStyle();
     } else {
-      base = widget.isSender
+      base = widget.isSender ? styles.getSelfStyle() : styles.getRemoteStyle();
-          ? styles.getSelfStyle()
-          : styles.getRemoteStyle();
     }
     switch (widget.matchHighlight) {
       case SearchHighlight.none:
@@ -130,7 +129,9 @@ class _ChatBubbleState extends State<ChatBubble>
       case SearchHighlight.secondary:
         return base.copyWith(
           borderWidth: 1.5,
-          borderColor: Theme.of(context).colorScheme.primary.withValues(alpha: 0.45),
+          borderColor: Theme.of(
+            context,
+          ).colorScheme.primary.withValues(alpha: 0.45),
         );
       case SearchHighlight.active:
         return base.copyWith(
@@ -342,68 +343,72 @@ class _BubbleContent extends StatelessWidget {
   });
 
   @override
-  Widget build(BuildContext context) => Container(
+  Widget build(BuildContext context) => MergeSemantics(
-    constraints: BoxConstraints(
+    child: Container(
-      maxWidth: MediaQuery.of(context).size.width * 0.9,
+      constraints: BoxConstraints(
-      minWidth: showActorDisplayName
+        maxWidth: MediaQuery.of(context).size.width * 0.9,
-          ? actorText.size.width
+        minWidth: showActorDisplayName
-          : timeText.size.width + (isSender ? spacing + timeIconSize : 0) + 3,
+            ? actorText.size.width
-    ),
+            : timeText.size.width + (isSender ? spacing + timeIconSize : 0) + 3,
-    child: Stack(
+      ),
-      children: [
+      child: Stack(
-        if (showActorDisplayName) Positioned(top: 0, left: 0, child: actorWidget),
+        children: [
-        Padding(
+          if (showActorDisplayName)
-          padding: EdgeInsets.only(
+            Positioned(top: 0, left: 0, child: actorWidget),
-            bottom: showBubbleTime ? 18 : 0,
+          Padding(
-            top: showActorDisplayName ? 18 : 0,
+            padding: EdgeInsets.only(
-          ),
+              bottom: showBubbleTime ? 18 : 0,
-          child: Column(
+              top: showActorDisplayName ? 18 : 0,
-            crossAxisAlignment: CrossAxisAlignment.start,
+            ),
-            children: [
+            child: Column(
-              if (parent != null &&
+              crossAxisAlignment: CrossAxisAlignment.start,
-                  bubbleData.messageType ==
-                      GetRoomResponseObjectMessageType.comment) ...[
-                AnswerReference(
-                  referenceMessage: parent!,
-                  selfId: selfId,
-                ),
-                const SizedBox(height: 5),
-              ],
-              messageWidget,
-            ],
-          ),
-        ),
-        if (showBubbleTime)
-          Positioned(
-            bottom: 0,
-            right: 0,
-            child: Row(
               children: [
-                timeText,
+                if (parent != null &&
-                if (isSender) ...[
+                    bubbleData.messageType ==
-                  SizedBox(width: spacing),
+                        GetRoomResponseObjectMessageType.comment) ...[
-                  Icon(
+                  AnswerReference(referenceMessage: parent!, selfId: selfId),
-                    isRead ? Icons.done_all_outlined : Icons.done_outlined,
+                  const SizedBox(height: 5),
-                    size: timeIconSize,
-                    color: timeIconColor,
-                  ),
                 ],
+                messageWidget,
               ],
             ),
           ),
-        if (downloadJob?.status.value is DownloadInProgress)
+          if (showBubbleTime)
-          Positioned(
+            Positioned(
-            bottom: 0,
+              bottom: 0,
-            right: 0,
+              right: 0,
-            left: 0,
+              child: Row(
-            child: LinearProgressIndicator(
+                children: [
-              value: () {
+                  timeText,
-                final s = downloadJob!.status.value as DownloadInProgress;
+                  if (isSender) ...[
-                return s.percent <= 0 ? null : s.percent / 100;
+                    SizedBox(width: spacing),
-              }(),
+                    Icon(
+                      isRead ? Icons.done_all_outlined : Icons.done_outlined,
+                      size: timeIconSize,
+                      color: timeIconColor,
+                      semanticLabel: isRead
+                          ? A11yLabels.messageRead
+                          : A11yLabels.messageSent,
+                    ),
+                  ],
+                ],
+              ),
             ),
-          ),
+          if (downloadJob?.status.value is DownloadInProgress)
-      ],
+            Positioned(
+              bottom: 0,
+              right: 0,
+              left: 0,
+              child: LinearProgressIndicator(
+                semanticsLabel: A11yLabels.downloadingFile,
+                value: () {
+                  final s = downloadJob!.status.value as DownloadInProgress;
+                  return s.percent <= 0 ? null : s.percent / 100;
+                }(),
+              ),
+            ),
+        ],
+      ),
     ),
   );
 }

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

@@ -6,6 +6,7 @@ import '../../../../api/marianumcloud/talk/delete_react_message/delete_react_mes
 import '../../../../api/marianumcloud/talk/react_message/react_message.dart';
 import '../../../../api/marianumcloud/talk/react_message/react_message_params.dart';
 import '../../../../api/marianumcloud/talk/room/get_room_response.dart';
+import '../../../../widget/a11y/a11y_labels.dart';
 import '../../../../widget/async_action_button.dart';
 import '../../../../widget/demo_restricted.dart';
 import '../../../../widget/emoji_text.dart';
@@ -41,44 +42,58 @@ class ChatBubbleReactions extends StatelessWidget {
           children: reactions.entries.map<Widget>((e) {
             final hasSelfReacted =
                 bubbleData.reactionsSelf?.contains(e.key) ?? false;
+            void toggle() {
+              if (guardDemoAction(context)) return;
+              runWithErrorDialog(context, () async {
+                if (hasSelfReacted) {
+                  await DeleteReactMessage(
+                    chatToken: chatData.token,
+                    messageId: bubbleData.id,
+                    params: DeleteReactMessageParams(e.key),
+                  ).run();
+                } else {
+                  await ReactMessage(
+                    chatToken: chatData.token,
+                    messageId: bubbleData.id,
+                    params: ReactMessageParams(e.key),
+                  ).run();
+                }
+                onChanged(renew: true);
+              });
+            }
+
+            // Ownership (eigene Reaktion) wird visuell nur über die
+            // Hintergrundfarbe transportiert – für den Screenreader ins Label.
+            final label = hasSelfReacted
+                ? '${e.key} ${e.value}, ${A11yLabels.yourReaction}'
+                : '${e.key} ${e.value}';
             return Container(
               margin: const EdgeInsets.only(right: 2.5, left: 2.5),
-              child: ActionChip(
+              child: Semantics(
-                label: Row(
+                button: true,
-                  mainAxisSize: MainAxisSize.min,
+                label: label,
-                  children: [
+                onTap: toggle,
-                    EmojiText(e.key, size: EmojiText.sizeInline),
+                child: ExcludeSemantics(
-                    const SizedBox(width: 4),
+                  child: ActionChip(
-                    Text('${e.value}'),
+                    label: Row(
-                  ],
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        EmojiText(e.key, size: EmojiText.sizeInline),
+                        const SizedBox(width: 4),
+                        Text('${e.value}'),
+                      ],
+                    ),
+                    visualDensity: const VisualDensity(
+                      vertical: VisualDensity.minimumDensity,
+                      horizontal: VisualDensity.minimumDensity,
+                    ),
+                    padding: EdgeInsets.zero,
+                    backgroundColor: hasSelfReacted
+                        ? Theme.of(context).primaryColor
+                        : null,
+                    onPressed: toggle,
+                  ),
                 ),
-                visualDensity: const VisualDensity(
-                  vertical: VisualDensity.minimumDensity,
-                  horizontal: VisualDensity.minimumDensity,
-                ),
-                padding: EdgeInsets.zero,
-                backgroundColor: hasSelfReacted
-                    ? Theme.of(context).primaryColor
-                    : null,
-                onPressed: () {
-                  if (guardDemoAction(context)) return;
-                  runWithErrorDialog(context, () async {
-                    if (hasSelfReacted) {
-                      await DeleteReactMessage(
-                        chatToken: chatData.token,
-                        messageId: bubbleData.id,
-                        params: DeleteReactMessageParams(e.key),
-                      ).run();
-                    } else {
-                      await ReactMessage(
-                        chatToken: chatData.token,
-                        messageId: bubbleData.id,
-                        params: ReactMessageParams(e.key),
-                      ).run();
-                    }
-                    onChanged(renew: true);
-                  });
-                },
               ),
             );
           }).toList(),

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

@@ -259,6 +259,7 @@ class _ReactionsRowState extends State<_ReactionsRow> {
               ],
               _groupDivider(context),
               IconButton(
+                tooltip: 'Reaktion hinzufügen',
                 onPressed: busy ? null : () => _showEmojiPicker(context),
                 style: IconButton.styleFrom(
                   padding: EdgeInsets.zero,

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

@@ -30,6 +30,7 @@ class ChatSearchAppBar extends StatelessWidget implements PreferredSizeWidget {
         : '${activeIndex + 1}/$matchCount';
     return AppBar(
       leading: IconButton(
+        tooltip: 'Zurück',
         icon: const Icon(Icons.arrow_back),
         onPressed: onClose,
       ),
@@ -54,10 +55,12 @@ class ChatSearchAppBar extends StatelessWidget implements PreferredSizeWidget {
           ),
         ),
         IconButton(
+          tooltip: 'Vorheriges Ergebnis',
           icon: const Icon(Icons.keyboard_arrow_up),
           onPressed: onPrevious,
         ),
         IconButton(
+          tooltip: 'Nächstes Ergebnis',
           icon: const Icon(Icons.keyboard_arrow_down),
           onPressed: onNext,
         ),

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

@@ -268,6 +268,7 @@ class _ChatTextfieldState extends State<ChatTextfield> {
               ),
             ),
             IconButton(
+              tooltip: 'Antwort verwerfen',
               onPressed: () {
                 chatBloc.setReferenceMessageId(null);
                 _setDraftReply(null);

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

@@ -14,6 +14,7 @@ import '../../../../routing/app_routes.dart';
 import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../../../../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import '../../../../utils/haptics.dart';
+import '../../../../widget/a11y/a11y_labels.dart';
 import '../../../../widget/async_action_button.dart';
 import '../../../../widget/confirm_dialog.dart';
 import '../../../../widget/debug/debug_tile.dart';
@@ -106,6 +107,7 @@ class _ChatTileState extends State<ChatTile> {
                   Icons.star,
                   color: Colors.amberAccent,
                   size: 15,
+                  semanticLabel: A11yLabels.favorite,
                 ),
               ),
             ),
@@ -123,7 +125,11 @@ class _ChatTileState extends State<ChatTile> {
           ),
           if (widget.hasDraft) ...[
             const SizedBox(width: 5),
-            const Icon(Icons.edit_outlined, size: 15),
+            const Icon(
+              Icons.edit_outlined,
+              size: 15,
+              semanticLabel: A11yLabels.draft,
+            ),
           ],
         ],
       ),
@@ -134,17 +140,25 @@ class _ChatTileState extends State<ChatTile> {
       ),
       trailing: widget.data.unreadMessages <= 0
           ? null
-          : Container(
+          : Semantics(
-              padding: const EdgeInsets.all(1),
+              label: '${widget.data.unreadMessages} ${A11yLabels.unread}',
-              decoration: BoxDecoration(
+              child: ExcludeSemantics(
-                color: Theme.of(context).primaryColor,
+                child: Container(
-                borderRadius: BorderRadius.circular(30),
+                  padding: const EdgeInsets.all(1),
-              ),
+                  decoration: BoxDecoration(
-              constraints: const BoxConstraints(minWidth: 20, minHeight: 20),
+                    color: Theme.of(context).primaryColor,
-              child: Text(
+                    borderRadius: BorderRadius.circular(30),
-                '${widget.data.unreadMessages}',
+                  ),
-                style: const TextStyle(color: Colors.white, fontSize: 15),
+                  constraints: const BoxConstraints(
-                textAlign: TextAlign.center,
+                    minWidth: 20,
+                    minHeight: 20,
+                  ),
+                  child: Text(
+                    '${widget.data.unreadMessages}',
+                    style: const TextStyle(color: Colors.white, fontSize: 15),
+                    textAlign: TextAlign.center,
+                  ),
+                ),
               ),
             ),
       onTap: () {

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

@@ -16,7 +16,10 @@ class SplitViewPlaceholder extends StatelessWidget {
             data: MediaQuery.of(
               context,
             ).copyWith(invertColors: !AppTheme.isDarkMode(context)),
-            child: Image.asset('assets/logo/icon.png', height: 200),
+            // Dekoratives Logo – der „Talk"-Text darunter trägt die Aussage.
+            child: ExcludeSemantics(
+              child: Image.asset('assets/logo/icon.png', height: 200),
+            ),
           ),
           const SizedBox(height: 30),
           const Text(

lib/view/pages/timetable/custom_events/custom_events_view.dart

@@ -27,6 +27,7 @@ class CustomEventsView extends StatelessWidget {
       actions: [
         IconButton(
           icon: const Icon(Icons.add),
+          tooltip: 'Termin erstellen',
           onPressed: () => _openCreateDialog(context),
         ),
       ],
@@ -67,6 +68,7 @@ class CustomEventsView extends StatelessWidget {
                     children: [
                       IconButton(
                         icon: const Icon(Icons.edit_outlined),
+                        tooltip: 'Bearbeiten',
                         onPressed: () => showDialog(
                           context: context,
                           builder: (_) =>
@@ -75,6 +77,7 @@ class CustomEventsView extends StatelessWidget {
                       ),
                       IconButton(
                         icon: const Icon(Icons.delete_outline),
+                        tooltip: 'Löschen',
                         onPressed: () =>
                             showDeleteCustomEventDialog(context, e),
                       ),

lib/view/pages/timetable/details/lesson_sheet.dart

@@ -103,6 +103,7 @@ class LessonSheet {
   static Widget _roomTile(BuildContext context, McTimetableEntry lesson) {
     final trailing = IconButton(
       icon: const Icon(Icons.house_outlined),
+      tooltip: 'Raumplan öffnen',
       onPressed: () => AppRoutes.openRoomplan(context),
     );
 

lib/view/pages/timetable/subject_colors/search_subject_colors.dart

@@ -14,12 +14,17 @@ class SearchSubjectColors extends SearchDelegate<void> {
   @override
   List<Widget>? buildActions(BuildContext context) => [
     if (query.isNotEmpty)
-      IconButton(onPressed: () => query = '', icon: const Icon(Icons.clear)),
+      IconButton(
+        onPressed: () => query = '',
+        tooltip: 'Leeren',
+        icon: const Icon(Icons.clear),
+      ),
   ];
 
   @override
   Widget? buildLeading(BuildContext context) => IconButton(
     icon: const Icon(Icons.arrow_back),
+    tooltip: 'Zurück',
     onPressed: () => close(context, null),
   );
 

lib/view/pages/timetable/subject_colors/subject_colors_view.dart

@@ -21,6 +21,7 @@ class SubjectColorsView extends StatelessWidget {
       actions: [
         IconButton(
           icon: const Icon(Icons.search),
+          tooltip: 'Suchen',
           onPressed: () =>
               showSearch(context: context, delegate: SearchSubjectColors()),
         ),

lib/view/pages/timetable/timetable.dart

@@ -110,6 +110,7 @@ class _TimetableState extends State<Timetable> {
         actions: [
           IconButton(
             icon: const Icon(Icons.home_outlined),
+            tooltip: 'Zur aktuellen Woche',
             onPressed: atToday ? null : _jumpToToday,
           ),
           PopupMenuButton<_CalendarAction>(
@@ -179,6 +180,7 @@ class _TimetableState extends State<Timetable> {
         actions: [
           IconButton(
             icon: const Icon(Icons.home_outlined),
+            tooltip: 'Zur aktuellen Woche',
             onPressed: atToday ? null : _jumpToToday,
           ),
           if (canViewForeign)

lib/view/pages/timetable/widgets/calendar/outside_chips.dart

@@ -88,7 +88,7 @@ class _OutsideDayColumn extends StatelessWidget {
   }
 
   static String _subtitleFor(Appointment a) {
-    if (isAllDayLike(a)) return 'Ganztägig';
+    if (isAllDayLike(a)) return A11yLabels.allDay;
     return '${a.startTime.formatHm()}–${a.endTime.formatHm()}';
   }
 
@@ -122,6 +122,7 @@ class _OutsideDayColumn extends StatelessWidget {
               height: kOutsideChipHeight,
               child: _OutsideChip(
                 appointment: visible[i],
+                crossedOut: isCrossedOut(visible[i]),
                 onTap: () => onAppointmentTap(visible[i]),
               ),
             ),
@@ -144,15 +145,28 @@ class _OutsideDayColumn extends StatelessWidget {
 
 class _OutsideChip extends StatelessWidget {
   final Appointment appointment;
+  final bool crossedOut;
   final VoidCallback onTap;
 
-  const _OutsideChip({required this.appointment, required this.onTap});
+  const _OutsideChip({
+    required this.appointment,
+    required this.crossedOut,
+    required this.onTap,
+  });
 
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
     final allDay = isAllDayLike(appointment);
     final timeLabel = allDay ? null : appointment.startTime.formatHm();
+    final semanticsLabel = [
+      appointment.subject,
+      if (allDay)
+        A11yLabels.allDay
+      else
+        '${appointment.startTime.formatHm()}–${appointment.endTime.formatHm()}',
+      if (crossedOut) A11yLabels.cancelled,
+    ].join(', ');
 
     // Past chips fade further, future/ongoing ones get a more saturated tint
     // so the strip no longer reads as one uniform grey block.
@@ -163,47 +177,54 @@ class _OutsideChip extends StatelessWidget {
         : theme.colorScheme.onSurface;
     final subjectWeight = isPast ? FontWeight.w400 : FontWeight.w600;
 
-    return Material(
+    return Semantics(
-      color: appointment.color.withAlpha(backgroundAlpha),
+      button: true,
-      shape: const RoundedRectangleBorder(
+      label: semanticsLabel,
-        borderRadius: BorderRadius.all(Radius.circular(7)),
+      onTap: onTap,
-      ),
+      child: ExcludeSemantics(
-      clipBehavior: Clip.antiAlias,
+        child: Material(
-      child: InkWell(
+          color: appointment.color.withAlpha(backgroundAlpha),
-        onTap: onTap,
+          shape: const RoundedRectangleBorder(
-        child: Padding(
+            borderRadius: BorderRadius.all(Radius.circular(7)),
-          padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
+          ),
-          child: Row(
+          clipBehavior: Clip.antiAlias,
-            mainAxisSize: MainAxisSize.max,
+          child: InkWell(
-            children: [
+            onTap: onTap,
-              Expanded(
+            child: Padding(
-                child: Text(
+              padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
-                  appointment.subject,
+              child: Row(
-                  maxLines: 1,
+                mainAxisSize: MainAxisSize.max,
-                  overflow: TextOverflow.ellipsis,
+                children: [
-                  softWrap: false,
+                  Expanded(
-                  style: theme.textTheme.labelSmall?.copyWith(
+                    child: Text(
-                    color: subjectColor,
+                      appointment.subject,
-                    fontWeight: subjectWeight,
+                      maxLines: 1,
-                  ),
+                      overflow: TextOverflow.ellipsis,
-                ),
+                      softWrap: false,
-              ),
+                      style: theme.textTheme.labelSmall?.copyWith(
-              if (timeLabel != null) ...[
+                        color: subjectColor,
-                const SizedBox(width: 4),
+                        fontWeight: subjectWeight,
-                Flexible(
+                      ),
-                  child: Text(
-                    timeLabel,
-                    maxLines: 1,
-                    overflow: TextOverflow.fade,
-                    softWrap: false,
-                    style: theme.textTheme.labelSmall?.copyWith(
-                      color: theme.colorScheme.onSurfaceVariant,
-                      fontSize: 10,
                     ),
                   ),
-                ),
+                  if (timeLabel != null) ...[
-              ],
+                    const SizedBox(width: 4),
-            ],
+                    Flexible(
+                      child: Text(
+                        timeLabel,
+                        maxLines: 1,
+                        overflow: TextOverflow.fade,
+                        softWrap: false,
+                        style: theme.textTheme.labelSmall?.copyWith(
+                          color: theme.colorScheme.onSurfaceVariant,
+                          fontSize: 10,
+                        ),
+                      ),
+                    ),
+                  ],
+                ],
+              ),
+            ),
           ),
         ),
       ),
@@ -220,18 +241,25 @@ class _OutsideOverflowChip extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
-    return Material(
+    return Semantics(
-      color: theme.colorScheme.secondaryContainer,
+      button: true,
-      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(6)),
+      label: A11yLabels.moreAppointments(count),
-      clipBehavior: Clip.antiAlias,
+      onTap: onTap,
-      child: InkWell(
+      child: ExcludeSemantics(
-        onTap: onTap,
+        child: Material(
-        child: Center(
+          color: theme.colorScheme.secondaryContainer,
-          child: Text(
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(6)),
-            '+$count weitere',
+          clipBehavior: Clip.antiAlias,
-            style: theme.textTheme.labelSmall?.copyWith(
+          child: InkWell(
-              color: theme.colorScheme.onSecondaryContainer,
+            onTap: onTap,
-              fontWeight: FontWeight.w600,
+            child: Center(
+              child: Text(
+                '+$count weitere',
+                style: theme.textTheme.labelSmall?.copyWith(
+                  color: theme.colorScheme.onSecondaryContainer,
+                  fontWeight: FontWeight.w600,
+                ),
+              ),
             ),
           ),
         ),

lib/view/pages/timetable/widgets/calendar/week_grid.dart

@@ -112,6 +112,7 @@ class _PeriodLabel extends StatelessWidget {
           Icons.coffee_outlined,
           size: 12,
           color: secondaryTextColor.withAlpha(180),
+          semanticLabel: A11yLabels.breakTime,
         ),
       );
     }
@@ -328,18 +329,39 @@ class _DayColumn extends StatelessWidget {
                     left: cell.lane * width / cell.laneCount,
                     width: width / cell.laneCount,
                     child: switch (cell) {
-                      LaidOutAppointment(:final appointment) => GestureDetector(
+                      LaidOutAppointment(:final appointment) => Semantics(
-                        behavior: HitTestBehavior.opaque,
+                        button: true,
-                        onTap: () => onAppointmentTap(appointment),
+                        label: A11yLabels.appointmentLabel(
-                        child: AppointmentTile(
+                          subject: appointment.subject,
-                          appointment: appointment,
+                          location: appointment.location ?? '',
+                          start: appointment.startTime,
+                          end: appointment.endTime,
                           crossedOut: isCrossedOut(appointment),
                         ),
+                        onTap: () => onAppointmentTap(appointment),
+                        child: ExcludeSemantics(
+                          child: GestureDetector(
+                            behavior: HitTestBehavior.opaque,
+                            onTap: () => onAppointmentTap(appointment),
+                            child: AppointmentTile(
+                              appointment: appointment,
+                              crossedOut: isCrossedOut(appointment),
+                            ),
+                          ),
+                        ),
                       ),
-                      LaidOutOverflow(:final appointments) => GestureDetector(
+                      LaidOutOverflow(:final appointments) => Semantics(
-                        behavior: HitTestBehavior.opaque,
+                        button: true,
+                        label: A11yLabels.moreAppointments(appointments.length),
                         onTap: () => _showOverflowSheet(context, appointments),
-                        child: _OverflowTile(count: appointments.length),
+                        child: ExcludeSemantics(
+                          child: GestureDetector(
+                            behavior: HitTestBehavior.opaque,
+                            onTap: () =>
+                                _showOverflowSheet(context, appointments),
+                            child: _OverflowTile(count: appointments.length),
+                          ),
+                        ),
                       ),
                     },
                   ),

lib/view/pages/timetable/widgets/custom_workweek_calendar.dart

@@ -14,6 +14,7 @@ import 'package:syncfusion_flutter_calendar/calendar.dart';
 
 import '../../../../extensions/date_time.dart';
 import '../../../../utils/haptics.dart';
+import '../../../../widget/a11y/a11y_labels.dart';
 import '../../../../widget/details_bottom_sheet.dart';
 import '../data/calendar_layout.dart';
 import '../data/calendar_logic.dart';

lib/widget/a11y/a11y_labels.dart

@@ -0,0 +1,49 @@
+import '../../extensions/date_time.dart';
+
+/// Zentrale deutschsprachige Screenreader-Labels. Single Source of Truth für
+/// alle `Semantics`/`semanticLabel`/`tooltip`-Texte – und der eine Punkt, an
+/// dem später echtes l10n andockt (die App ist aktuell fest auf `de`).
+abstract final class A11yLabels {
+  // Zustände
+  static const loading = 'Lädt';
+  static const downloadingFile = 'Lädt herunter';
+
+  // Chat
+  static const messageRead = 'Gelesen';
+  static const messageSent = 'Gesendet';
+  static const unread = 'Ungelesen';
+  static const favorite = 'Favorit';
+  static const draft = 'Entwurf';
+  static const yourReaction = 'deine Reaktion';
+
+  // Bilder
+  static const profilePicture = 'Profilbild';
+  static const groupPicture = 'Gruppenbild';
+  static const roomPlan = 'Raumplan der Schule als Grafik';
+
+  // Stundenplan
+  static const cancelled = 'Ausfall';
+  static const breakTime = 'Pause';
+  static const allDay = 'Ganztägig';
+
+  /// Beschreibt eine Stundenplan-Kachel für den Screenreader, z.B.
+  /// „Mathe, Raum 101, 08:00–08:45, Ausfall". Zeilenumbrüche in [location]
+  /// (Raum/Lehrer stehen dort mehrzeilig) werden zu Trennern geglättet.
+  static String appointmentLabel({
+    required String subject,
+    required String location,
+    required DateTime start,
+    required DateTime end,
+    required bool crossedOut,
+  }) {
+    final parts = <String>[subject];
+    final loc = location.replaceAll('\n', ', ').trim();
+    if (loc.isNotEmpty) parts.add(loc);
+    parts.add('${start.formatHm()}–${end.formatHm()}');
+    if (crossedOut) parts.add(cancelled);
+    return parts.join(', ');
+  }
+
+  /// „+3 weitere Termine" für die zusammengefasste Overflow-Kachel.
+  static String moreAppointments(int count) => '+$count weitere Termine';
+}

lib/widget/app_progress_indicator.dart

@@ -1,24 +1,43 @@
 import 'package:flutter/material.dart';
 
+import 'a11y/a11y_labels.dart';
+
 class AppProgressIndicator extends StatelessWidget {
   final double size;
   final double strokeWidth;
   final Color? color;
+  final String semanticsLabel;
 
   const AppProgressIndicator._({
     required this.size,
     required this.strokeWidth,
     this.color,
+    this.semanticsLabel = A11yLabels.loading,
   });
 
-  const AppProgressIndicator.small({Color? color})
+  const AppProgressIndicator.small({Color? color, String? semanticsLabel})
-    : this._(size: 16, strokeWidth: 2, color: color);
+    : this._(
+        size: 16,
+        strokeWidth: 2,
+        color: color,
+        semanticsLabel: semanticsLabel ?? A11yLabels.loading,
+      );
 
-  const AppProgressIndicator.medium({Color? color})
+  const AppProgressIndicator.medium({Color? color, String? semanticsLabel})
-    : this._(size: 24, strokeWidth: 2.5, color: color);
+    : this._(
+        size: 24,
+        strokeWidth: 2.5,
+        color: color,
+        semanticsLabel: semanticsLabel ?? A11yLabels.loading,
+      );
 
-  const AppProgressIndicator.large({Color? color})
+  const AppProgressIndicator.large({Color? color, String? semanticsLabel})
-    : this._(size: 40, strokeWidth: 3, color: color);
+    : this._(
+        size: 40,
+        strokeWidth: 3,
+        color: color,
+        semanticsLabel: semanticsLabel ?? A11yLabels.loading,
+      );
 
   @override
   Widget build(BuildContext context) {
@@ -29,6 +48,7 @@ class AppProgressIndicator extends StatelessWidget {
       child: CircularProgressIndicator(
         strokeWidth: strokeWidth,
         valueColor: AlwaysStoppedAnimation<Color>(resolved),
+        semanticsLabel: semanticsLabel,
       ),
     );
   }

lib/widget/async_actions/async_mixin.dart

@@ -105,10 +105,14 @@ class _InlineErrorWrapper extends StatelessWidget {
             child,
             if (err != null) ...[
               const SizedBox(height: 8),
-              Text(
+              Semantics(
-                err,
+                liveRegion: true,
-                textAlign: TextAlign.center,
+                container: true,
-                style: _asyncErrorTextStyle(context),
+                child: Text(
+                  err,
+                  textAlign: TextAlign.center,
+                  style: _asyncErrorTextStyle(context),
+                ),
               ),
             ],
           ],

lib/widget/emoji_picker_dialog.dart

@@ -20,6 +20,7 @@ Future<String?> showEmojiPicker(
       title: Row(
         children: [
           IconButton(
+            tooltip: 'Zurück',
             onPressed: () => Navigator.of(pickerCtx).pop(),
             icon: const Icon(Icons.arrow_back),
           ),

lib/widget/file_viewer.dart

@@ -249,6 +249,7 @@ class _FileViewerState extends State<FileViewer> {
               photoViewController.rotation += pi / 2;
             });
           },
+          tooltip: 'Drehen',
           icon: const Icon(Icons.rotate_right),
         ),
       ],

lib/widget/large_profile_picture_view.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:photo_view/photo_view.dart';
 
 import '../model/account_data.dart';
+import 'a11y/a11y_labels.dart';
 import 'user_avatar.dart';
 
 class LargeProfilePictureView extends StatelessWidget {
@@ -15,18 +16,25 @@ class LargeProfilePictureView extends StatelessWidget {
   });
 
   @override
-  Widget build(BuildContext context) => Scaffold(
+  Widget build(BuildContext context) {
-    appBar: AppBar(title: Text(isGroup ? 'Gruppenbild' : 'Profilbild')),
+    final label = isGroup ? A11yLabels.groupPicture : A11yLabels.profilePicture;
-    body: PhotoView(
+    return Scaffold(
-      minScale: 0.5,
+      appBar: AppBar(title: Text(label)),
-      maxScale: 3.0,
+      body: Semantics(
-      imageProvider: Image.network(
+        image: true,
-        avatarUrl(id: id, isGroup: isGroup, size: 1024),
+        label: label,
-        headers: {'Authorization': AccountData().getBasicAuthHeader()},
+        child: PhotoView(
-      ).image,
+          minScale: 0.5,
-      backgroundDecoration: BoxDecoration(
+          maxScale: 3.0,
-        color: Theme.of(context).colorScheme.surface,
+          imageProvider: Image.network(
+            avatarUrl(id: id, isGroup: isGroup, size: 1024),
+            headers: {'Authorization': AccountData().getBasicAuthHeader()},
+          ).image,
+          backgroundDecoration: BoxDecoration(
+            color: Theme.of(context).colorScheme.surface,
+          ),
+        ),
       ),
-    ),
+    );
-  );
+  }
 }

lib/widget/user_avatar.dart

@@ -10,6 +10,7 @@ import 'package:http/http.dart' as http;
 import '../model/account_data.dart';
 import '../model/endpoint_data.dart';
 import '../push/push_avatar.dart';
+import 'a11y/a11y_labels.dart';
 import 'avatar_disk_cache.dart';
 
 class UserAvatar extends StatefulWidget {
@@ -17,6 +18,10 @@ class UserAvatar extends StatefulWidget {
   final bool isGroup;
   final int size;
 
+  /// Screenreader-Beschreibung. Aufrufer, die den Namen kennen, sollten ihn
+  /// mitgeben; sonst greift ein generisches „Profilbild"/„Gruppenbild".
+  final String? semanticLabel;
+
   /// Server-side pixel size requested for user avatars. `null` lets the
   /// widget pick `(size * 4).clamp(64, 1024)` — enough headroom for typical
   /// device pixel ratios. Group avatars ignore this (Spreed serves one
@@ -28,6 +33,7 @@ class UserAvatar extends StatefulWidget {
     this.isGroup = false,
     this.size = 20,
     this.requestSize,
+    this.semanticLabel,
     super.key,
   });
 
@@ -225,7 +231,9 @@ class _UserAvatarState extends State<UserAvatar> {
     final pending = _pendingAvatars.putIfAbsent(url, () {
       final future = _fetch(url);
       future.whenComplete(() {
-        if (identical(_pendingAvatars[url], future)) _pendingAvatars.remove(url);
+        if (identical(_pendingAvatars[url], future)) {
+          _pendingAvatars.remove(url);
+        }
       });
       return future;
     });
@@ -345,12 +353,24 @@ class _UserAvatarState extends State<UserAvatar> {
       );
     }
 
-    return CircleAvatar(
+    return Semantics(
-      radius: radius,
+      image: true,
-      backgroundColor: theme.primaryColor,
+      label:
-      foregroundColor: Colors.white,
+          widget.semanticLabel ??
-      child: ClipOval(
+          (widget.isGroup
-        child: SizedBox(width: radius * 2, height: radius * 2, child: content),
+              ? A11yLabels.groupPicture
+              : A11yLabels.profilePicture),
+      child: CircleAvatar(
+        radius: radius,
+        backgroundColor: theme.primaryColor,
+        foregroundColor: Colors.white,
+        child: ClipOval(
+          child: SizedBox(
+            width: radius * 2,
+            height: radius * 2,
+            child: content,
+          ),
+        ),
       ),
     );
   }

test/widget/a11y_labels_test.dart

@@ -0,0 +1,63 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jiffy/jiffy.dart';
+import 'package:marianum_mobile/widget/a11y/a11y_labels.dart';
+
+void main() {
+  setUpAll(() async {
+    // appointmentLabel formatiert über formatHm() (Jiffy) – Locale einmal laden.
+    await Jiffy.setLocale('de');
+  });
+
+  group('A11yLabels.appointmentLabel', () {
+    test('setzt Fach, Ort und Zeitspanne zusammen', () {
+      final label = A11yLabels.appointmentLabel(
+        subject: 'Mathe',
+        location: 'Raum 101',
+        start: DateTime(2026, 5, 8, 8, 0),
+        end: DateTime(2026, 5, 8, 8, 45),
+        crossedOut: false,
+      );
+      expect(label, 'Mathe, Raum 101, 08:00–08:45');
+    });
+
+    test('hängt bei Ausfall den Ausfall-Hinweis an', () {
+      final label = A11yLabels.appointmentLabel(
+        subject: 'Deutsch',
+        location: 'Raum 5',
+        start: DateTime(2026, 5, 8, 9, 0),
+        end: DateTime(2026, 5, 8, 9, 45),
+        crossedOut: true,
+      );
+      expect(label, endsWith(A11yLabels.cancelled));
+      expect(label, 'Deutsch, Raum 5, 09:00–09:45, Ausfall');
+    });
+
+    test('glättet Zeilenumbrüche im Ort zu Trennern', () {
+      final label = A11yLabels.appointmentLabel(
+        subject: 'Sport',
+        location: 'Halle\nHr. Müller',
+        start: DateTime(2026, 5, 8, 10, 0),
+        end: DateTime(2026, 5, 8, 10, 45),
+        crossedOut: false,
+      );
+      expect(label, 'Sport, Halle, Hr. Müller, 10:00–10:45');
+    });
+
+    test('lässt einen leeren Ort weg', () {
+      final label = A11yLabels.appointmentLabel(
+        subject: 'Pause',
+        location: '',
+        start: DateTime(2026, 5, 8, 11, 0),
+        end: DateTime(2026, 5, 8, 11, 15),
+        crossedOut: false,
+      );
+      expect(label, 'Pause, 11:00–11:15');
+    });
+  });
+
+  group('A11yLabels.moreAppointments', () {
+    test('pluralisiert die Overflow-Beschriftung', () {
+      expect(A11yLabels.moreAppointments(3), '+3 weitere Termine');
+    });
+  });
+}

test/widget/app_progress_indicator_test.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/widget/a11y/a11y_labels.dart';
+import 'package:marianum_mobile/widget/app_progress_indicator.dart';
+
+void main() {
+  Widget wrap(Widget child) => MaterialApp(home: Scaffold(body: child));
+
+  testWidgets('trägt standardmäßig das Lade-Label an den Screenreader', (
+    tester,
+  ) async {
+    await tester.pumpWidget(wrap(const AppProgressIndicator.large()));
+
+    final indicator = tester.widget<CircularProgressIndicator>(
+      find.byType(CircularProgressIndicator),
+    );
+    expect(indicator.semanticsLabel, A11yLabels.loading);
+  });
+
+  testWidgets('reicht ein spezifisches Label durch', (tester) async {
+    await tester.pumpWidget(
+      wrap(const AppProgressIndicator.small(semanticsLabel: 'Wird gesendet')),
+    );
+
+    final indicator = tester.widget<CircularProgressIndicator>(
+      find.byType(CircularProgressIndicator),
+    );
+    expect(indicator.semanticsLabel, 'Wird gesendet');
+  });
+}