Add midnight fallback notice, overnight simulations, and keyboard log filter

lib/providers.dart

@@ -29,8 +29,7 @@ class BackgroundRotateCommand {
         action = BackgroundRotateAction.random;
 }
 
-final backgroundRotateCommandProvider =
-    StateProvider<BackgroundRotateCommand>(
+final backgroundRotateCommandProvider = StateProvider<BackgroundRotateCommand>(
   (ref) => const BackgroundRotateCommand.initial(),
 );
 
@@ -101,6 +100,44 @@ final todayScheduleProvider = Provider<DailyPrayerSchedule?>((ref) {
   return SyncService.instance.getTodaySchedule(clock);
 });
 
+class RuntimeScheduleData {
+  final DailyPrayerSchedule? schedule;
+  final bool isFallbackFromPreviousDay;
+
+  const RuntimeScheduleData({
+    required this.schedule,
+    this.isFallbackFromPreviousDay = false,
+  });
+
+  const RuntimeScheduleData.empty()
+      : schedule = null,
+        isFallbackFromPreviousDay = false;
+}
+
+/// Runtime schedule used by main display/state machine.
+/// If today's data is missing after midnight, we temporarily fallback to yesterday
+/// so screen remains operational while showing a waiting-for-update notice.
+final runtimeScheduleProvider = Provider<RuntimeScheduleData>((ref) {
+  final clock = ref.watch(clockProvider).valueOrNull;
+  if (clock == null) return const RuntimeScheduleData.empty();
+
+  final today = SyncService.instance.getTodaySchedule(clock);
+  if (today != null) {
+    return RuntimeScheduleData(schedule: today);
+  }
+
+  final previousDay = clock.subtract(const Duration(days: 1));
+  final fallback = SyncService.instance.getTodaySchedule(previousDay);
+  if (fallback != null) {
+    return RuntimeScheduleData(
+      schedule: fallback,
+      isFallbackFromPreviousDay: true,
+    );
+  }
+
+  return const RuntimeScheduleData.empty();
+});
+
 final scheduleCacheStatusProvider = Provider<ScheduleCacheStatus>((ref) {
   final clock = ref.watch(clockProvider).valueOrNull ?? DateTime.now();
   return SyncService.instance.getCacheStatus(clock);
@@ -149,7 +186,7 @@ class ScreenStateData {
 
 final screenStateProvider = Provider<ScreenStateData>((ref) {
   final clock = ref.watch(clockProvider).valueOrNull ?? DateTime.now();
-  final schedule = ref.watch(todayScheduleProvider);
+  final schedule = ref.watch(runtimeScheduleProvider).schedule;
   final settings = ref.watch(settingsProvider);
   final isFriday = clock.weekday == DateTime.friday;