chore(10-01): delete orphaned v1.0 daily plan presentation files and remove DailyPlanState

- Delete daily_plan_providers.dart (orphaned since Phase 5 calendar strip)
- Delete daily_plan_task_row.dart (orphaned since Phase 5 calendar strip)
- Delete progress_card.dart (orphaned since Phase 5 calendar strip)
- Remove DailyPlanState class from daily_plan_models.dart (only used by deleted files)
- Preserve TaskWithRoom class (still used by calendar system)

lib/features/home/domain/daily_plan_models.dart

@@ -13,19 +13,3 @@ class TaskWithRoom {
   });
 }
 
-/// Daily plan data categorized into sections with progress tracking.
-class DailyPlanState {
-  final List<TaskWithRoom> overdueTasks;
-  final List<TaskWithRoom> todayTasks;
-  final List<TaskWithRoom> tomorrowTasks;
-  final int completedTodayCount;
-  final int totalTodayCount;
-
-  const DailyPlanState({
-    required this.overdueTasks,
-    required this.todayTasks,
-    required this.tomorrowTasks,
-    required this.completedTodayCount,
-    required this.totalTodayCount,
-  });
-}