fixed overwrite on internal copy, DST drift in widget anchors, inline errors without controller and removed dead room lookup

test/widget_data/widget_data_mapper_test.dart

@@ -97,6 +97,14 @@ void main() {
       );
       expect(anchor, DateTime(2026, 5, 11));
     });
+
+    // Only discriminating when run in a DST zone (e.g. TZ=Europe/Berlin).
+    test('stays at midnight across the DST fall-back weekend', () {
+      final anchor = WidgetDataMapper.resolveDayAnchor(
+        DateTime(2026, 10, 25, 12),
+      );
+      expect(anchor, DateTime(2026, 10, 26));
+    });
   });
 
   group('resolveWeekAnchor', () {
@@ -137,7 +145,6 @@ void main() {
         now: now,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
       );
       expect(data.lessons, hasLength(1));
@@ -174,7 +181,6 @@ void main() {
         now: now,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
       );
       expect(data.lessons.map((l) => l.status).toList(), [
@@ -199,7 +205,6 @@ void main() {
         now: now,
         lessons: const [],
         subjects: null,
-        rooms: null,
         holidays: holidays,
       );
       expect(data.isHoliday, isTrue);
@@ -231,7 +236,6 @@ void main() {
         now: now,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
       );
       expect(data.lessons.map((l) => l.subjectShort).toList(), [
@@ -278,7 +282,6 @@ void main() {
         now: now,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
         customEvents: events,
       );
@@ -315,7 +318,6 @@ void main() {
         now: now,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
         customEvents: events,
       );
@@ -336,7 +338,6 @@ void main() {
         now: DateTime(2026, 5, 5, 10),
         lessons: const [],
         subjects: null,
-        rooms: null,
         holidays: null,
         customEvents: events,
       );
@@ -376,7 +377,6 @@ void main() {
         now: now,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
         customEvents: events,
       );
@@ -411,7 +411,6 @@ void main() {
           now: now,
           lessons: [lesson],
           subjects: null,
-          rooms: null,
           holidays: null,
           showClassInsteadOfTeacher: true,
         ).lessons.single;
@@ -458,7 +457,6 @@ void main() {
       now: now,
       lessons: [lesson],
       subjects: subjects,
-      rooms: null,
       holidays: null,
     ).lessons.single;
 
@@ -544,7 +542,6 @@ void main() {
         now: now,
         lessons: const [],
         subjects: null,
-        rooms: null,
         holidays: null,
         customEvents: GetCustomTimetableEventResponse([
           _event(
@@ -599,7 +596,6 @@ void main() {
         now: now,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
       );
       expect(data.anchorDate, DateTime(2026, 5, 4));
@@ -633,7 +629,6 @@ void main() {
         now: fridayEvening,
         lessons: lessons,
         subjects: null,
-        rooms: null,
         holidays: null,
       );
       expect(data.anchorDate, DateTime(2026, 5, 11));
@@ -655,7 +650,6 @@ void main() {
         now: now,
         lessons: const [],
         subjects: null,
-        rooms: null,
         holidays: holidays,
       );
       expect(data.days, hasLength(WidgetDataMapper.weekWindowDays));
@@ -687,7 +681,6 @@ void main() {
         now: now,
         lessons: const [],
         subjects: null,
-        rooms: null,
         holidays: holidays,
       );
       expect(data.isHoliday, isTrue);