simplified code across the app and consolidated duplicated helpers

lib/widget_data/widget_publisher.dart

@@ -80,22 +80,10 @@ class WidgetPublisher {
         ]);
         _lastFlags = flags;
       }
-      final lessons = state.getAllKnownLessons();
       final now = widgetNow();
-      final dayData = WidgetDataMapper.buildDayData(
+      final (day: dayData, week: weekData) = WidgetDataMapper.buildSnapshot(
         now: now,
-        lessons: lessons,
-        subjects: state.subjects,
-        rooms: state.rooms,
-        holidays: state.schoolHolidays,
-        timegrid: state.timegrid,
-        customEvents: state.customEvents,
-        connectDoubleLessons: connectDouble,
-        showClassInsteadOfTeacher: isTeacher,
-      );
-      final weekData = WidgetDataMapper.buildWeekData(
-        now: now,
-        lessons: lessons,
+        lessons: state.getAllKnownLessons(),
         subjects: state.subjects,
         rooms: state.rooms,
         holidays: state.schoolHolidays,
@@ -121,10 +109,7 @@ class WidgetPublisher {
       }
       _lastSignature = signature;
       _lastPublishedAt = now;
-      await WidgetSync.writeDayData(dayData);
-      await WidgetSync.writeWeekData(weekData);
-      await WidgetSync.setLoggedIn(true);
-      await WidgetSync.triggerUpdate();
+      await WidgetSync.publishSnapshot(day: dayData, week: weekData);
     } on Object catch (e, s) {
       // Catch Object: non-Exception Errors (RangeError, StateError) from the
       // bloc layer must not escape into the stream listener.
@@ -135,15 +120,5 @@ class WidgetPublisher {
   static Map<String, Object?> _withoutFetchedAt(Map<String, Object?> json) =>
       Map.of(json)..remove('fetchedAt');
 
-  static String _themeName(ThemeMode? mode) {
-    switch (mode) {
-      case ThemeMode.light:
-        return 'light';
-      case ThemeMode.dark:
-        return 'dark';
-      case ThemeMode.system:
-      case null:
-        return 'system';
-    }
-  }
+  static String _themeName(ThemeMode? mode) => (mode ?? ThemeMode.system).name;
 }