feat(11-01): remove checkbox-disable restrictions for future tasks

- Remove isFuture guard in calendar_day_list.dart, pass canComplete: true always
- Remove isFuture check in task_row.dart, always enable Checkbox.onChanged
- calendar_task_row.dart unchanged (canComplete param already defaults to true)

lib/features/home/presentation/calendar_day_list.dart

@@ -240,9 +240,6 @@ class _CalendarDayListState extends ConsumerState<CalendarDayList> {
     AppLocalizations l10n,
     ThemeData theme,
   ) {
-    final now = DateTime.now();
-    final today = DateTime(now.year, now.month, now.day);
-    final isFuture = state.selectedDate.isAfter(today);
     final showRoomTag = widget.roomId == null;
 
     final items = <Widget>[];
@@ -268,7 +265,7 @@ class _CalendarDayListState extends ConsumerState<CalendarDayList> {
         tw,
         isOverdue: false,
         showRoomTag: showRoomTag,
-        canComplete: !isFuture,
+        canComplete: true,
       ));
     }