Add TimeSelector and ScheduleModal components with tests

- Implemented TimeSelector component for selecting time with AM/PM toggle and minute/hour increment/decrement functionality.
- Created ScheduleModal component for scheduling chores with options for specific days or intervals.
- Added utility functions for scheduling logic in scheduleUtils.ts.
- Developed comprehensive tests for TimeSelector and scheduleUtils functions to ensure correct behavior.

backend/db/chore_schedules.py

@@ -0,0 +1,39 @@
+from db.db import chore_schedules_db
+from models.chore_schedule import ChoreSchedule
+from tinydb import Query
+
+
+def get_schedule(child_id: str, task_id: str) -> ChoreSchedule | None:
+    q = Query()
+    result = chore_schedules_db.search((q.child_id == child_id) & (q.task_id == task_id))
+    if not result:
+        return None
+    return ChoreSchedule.from_dict(result[0])
+
+
+def upsert_schedule(schedule: ChoreSchedule) -> None:
+    q = Query()
+    existing = chore_schedules_db.get((q.child_id == schedule.child_id) & (q.task_id == schedule.task_id))
+    if existing:
+        chore_schedules_db.update(schedule.to_dict(), (q.child_id == schedule.child_id) & (q.task_id == schedule.task_id))
+    else:
+        chore_schedules_db.insert(schedule.to_dict())
+
+
+def delete_schedule(child_id: str, task_id: str) -> bool:
+    q = Query()
+    existing = chore_schedules_db.get((q.child_id == child_id) & (q.task_id == task_id))
+    if not existing:
+        return False
+    chore_schedules_db.remove((q.child_id == child_id) & (q.task_id == task_id))
+    return True
+
+
+def delete_schedules_for_child(child_id: str) -> None:
+    q = Query()
+    chore_schedules_db.remove(q.child_id == child_id)
+
+
+def delete_schedules_for_task(task_id: str) -> None:
+    q = Query()
+    chore_schedules_db.remove(q.task_id == task_id)