implemented the Ticker module with a native ProseMirror document renderer and integrated API support for structured content, navigation trees, and proxied files

lib/state/app/modules/app_modules.dart

@@ -5,6 +5,7 @@ import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';
 
 import '../../../api/marianumconnect/queries/get_breakers/get_breakers_response.dart';
 import '../../../routing/app_routes.dart';
+import '../../../storage/modules_settings.dart';
 import '../../../view/pages/files/files.dart';
 import '../../../view/pages/grade_averages/grade_averages_view.dart';
 import '../../../view/pages/holidays/holidays_view.dart';
@@ -12,6 +13,7 @@ import '../../../view/pages/marianum_dates/marianum_dates_view.dart';
 import '../../../view/pages/marianum_message/marianum_message_list_view.dart';
 import '../../../view/pages/more/roomplan/roomplan.dart';
 import '../../../view/pages/talk/chat_list.dart';
+import '../../../view/pages/ticker/ticker_view.dart';
 import '../../../view/pages/timetable/timetable.dart';
 import '../../../widget/breaker/breaker.dart';
 import '../../../widget/centered_leading.dart';
@@ -48,6 +50,15 @@ class AppModule {
         breakerArea: BreakerArea.timetable,
         create: Timetable.new,
       ),
+      Modules.ticker: AppModule(
+        Modules.ticker,
+        name: 'Ticker',
+        // Icons.newspaper is already taken by the "Marianum Message" module;
+        // use feed to keep the two visually distinct.
+        icon: () => Icon(Icons.feed),
+        breakerArea: BreakerArea.ticker,
+        create: TickerView.new,
+      ),
       Modules.talk: AppModule(
         Modules.talk,
         name: 'Talk',
@@ -136,13 +147,59 @@ class AppModule {
     }
 
     return {
-      for (var element in settings.val().modulesSettings.moduleOrder.where(
-        (element) => available.containsKey(element),
-      ))
+      for (var element in effectiveModuleOrder(
+        settings.val().modulesSettings,
+      ).where((element) => available.containsKey(element)))
         element: available[element]!,
     };
   }
 
+  // A persisted moduleOrder predates modules added in newer app versions.
+  // Deriving the effective order at read time (instead of relying on a heal
+  // during hydration) makes it impossible for a module to vanish from the
+  // bottom bar, the "Mehr" menu and the settings list at once. Missing
+  // modules are inserted right after their closest declared predecessor so
+  // they land at their default position (e.g. the ticker between Stundenplan
+  // and Talk) instead of at the end of the "Mehr" menu.
+  static List<Modules> effectiveModuleOrder(ModulesSettings settings) {
+    final seen = <Modules>{};
+    final order = [
+      for (final m in settings.moduleOrder)
+        if (seen.add(m)) m,
+    ];
+    for (final missing in Modules.values) {
+      if (!seen.add(missing)) continue;
+      var insertAt = 0;
+      for (final predecessor in Modules.values.takeWhile(
+        (m) => m != missing,
+      )) {
+        final pos = order.indexOf(predecessor);
+        if (pos >= insertAt) insertAt = pos + 1;
+      }
+      order.insert(insertAt, missing);
+    }
+    return order;
+  }
+
+  // The settings list displays a capability-filtered subset, so reorder
+  // indices refer to that subset; the move is applied there and merged back
+  // into the full order (non-displayed modules keep their relative slots).
+  static List<Modules> reorderModuleOrder({
+    required List<Modules> displayed,
+    required List<Modules> effective,
+    required int oldIndex,
+    required int newIndex,
+  }) {
+    final moved = List<Modules>.from(displayed);
+    moved.insert(newIndex, moved.removeAt(oldIndex));
+    final displayedSet = displayed.toSet();
+    var moveIndex = 0;
+    return [
+      for (final m in effective)
+        displayedSet.contains(m) ? moved[moveIndex++] : m,
+    ];
+  }
+
   static const int minBottomBarSlots = 3;
   static const int maxBottomBarSlots = 5;
 
@@ -152,14 +209,9 @@ class AppModule {
 
     int desired;
     if (settings.autoFillBottomBar) {
-      final width = MediaQuery.of(context).size.width;
-      if (width >= 840) {
-        desired = 5;
-      } else if (width >= 600) {
-        desired = 4;
-      } else {
-        desired = 3;
-      }
+      // 4 content tabs so the bar shows 5 entries including "Mehr" — enough
+      // for the Ticker module without pushing "Dateien" into the overflow.
+      desired = 4;
     } else {
       desired = settings.fixedBottomBarSlots;
     }
@@ -225,6 +277,7 @@ class AppModule {
 
 enum Modules {
   timetable,
+  ticker,
   talk,
   files,
   marianumMessage,