feat: Refactor ScheduleModal to support interval scheduling with date input and deadline toggle

- Updated ChoreSchedule model to include anchor_date and interval_has_deadline.
- Refactored interval scheduling logic in scheduleUtils to use anchor_date.
- Introduced DateInputField component for selecting anchor dates in ScheduleModal.
- Enhanced ScheduleModal to include a stepper for interval days and a toggle for deadline.
- Updated tests for ScheduleModal and scheduleUtils to reflect new interval scheduling logic.
- Added DateInputField tests to ensure proper functionality and prop handling.

backend/tests/test_chore_schedule_api.py

@@ -117,7 +117,8 @@ def test_set_schedule_interval_mode(client):
     payload = {
         "mode": "interval",
         "interval_days": 3,
-        "anchor_weekday": 2,
+        "anchor_date": "2026-03-01",
+        "interval_has_deadline": True,
         "interval_hour": 14,
         "interval_minute": 30,
     }
@@ -126,25 +127,57 @@ def test_set_schedule_interval_mode(client):
     data = resp.get_json()
     assert data["mode"] == "interval"
     assert data["interval_days"] == 3
-    assert data["anchor_weekday"] == 2
+    assert data["anchor_date"] == "2026-03-01"
+    assert data["interval_has_deadline"] is True
     assert data["interval_hour"] == 14
     assert data["interval_minute"] == 30
 
 
-def test_set_schedule_interval_bad_days(client):
-    # interval_days = 1 is out of range [2–7]
-    payload = {"mode": "interval", "interval_days": 1, "anchor_weekday": 0}
+def test_set_schedule_interval_days_1_valid(client):
+    """interval_days=1 is now valid (range changed to [1, 7])."""
+    payload = {"mode": "interval", "interval_days": 1, "anchor_date": ""}
+    resp = client.put(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule', json=payload)
+    assert resp.status_code == 200
+    assert resp.get_json()["interval_days"] == 1
+
+
+def test_set_schedule_interval_days_0_invalid(client):
+    """interval_days=0 is still out of range."""
+    payload = {"mode": "interval", "interval_days": 0, "anchor_date": ""}
     resp = client.put(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule', json=payload)
     assert resp.status_code == 400
 
 
-def test_set_schedule_interval_bad_weekday(client):
-    # anchor_weekday = 7 is out of range [0–6]
-    payload = {"mode": "interval", "interval_days": 2, "anchor_weekday": 7}
+def test_set_schedule_interval_days_8_invalid(client):
+    """interval_days=8 is still out of range."""
+    payload = {"mode": "interval", "interval_days": 8, "anchor_date": ""}
     resp = client.put(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule', json=payload)
     assert resp.status_code == 400
 
 
+def test_set_schedule_interval_has_deadline_false(client):
+    """interval_has_deadline=False is accepted and persisted."""
+    payload = {
+        "mode": "interval",
+        "interval_days": 2,
+        "anchor_date": "",
+        "interval_has_deadline": False,
+        "interval_hour": 0,
+        "interval_minute": 0,
+    }
+    resp = client.put(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule', json=payload)
+    assert resp.status_code == 200
+    assert resp.get_json()["interval_has_deadline"] is False
+
+
+def test_set_schedule_interval_anchor_date_empty_string(client):
+    """anchor_date empty string is valid (means use today)."""
+    payload = {"mode": "interval", "interval_days": 2, "anchor_date": ""}
+    resp = client.put(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule', json=payload)
+    assert resp.status_code == 200
+    assert resp.get_json()["anchor_date"] == ""
+
+
 def test_set_schedule_invalid_mode(client):
     payload = {"mode": "weekly", "day_configs": []}
     resp = client.put(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule', json=payload)
@@ -160,13 +193,56 @@ def test_set_schedule_upserts_existing(client):
     # Overwrite with interval mode
     client.put(
         f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule',
-        json={"mode": "interval", "interval_days": 2, "anchor_weekday": 0, "interval_hour": 9, "interval_minute": 0},
+        json={"mode": "interval", "interval_days": 2, "anchor_date": "", "interval_hour": 9, "interval_minute": 0},
     )
     resp = client.get(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule')
     assert resp.status_code == 200
     assert resp.get_json()["mode"] == "interval"
 
 
+def test_old_record_missing_new_fields_loads_with_defaults(client):
+    """Old DB records without anchor_date/interval_has_deadline load with correct defaults."""
+    from db.chore_schedules import upsert_schedule
+    from models.chore_schedule import ChoreSchedule
+
+    # Insert a schedule as if it was created before phase 2 (missing new fields)
+    old_style = ChoreSchedule(
+        child_id=TEST_CHILD_ID,
+        task_id=TEST_TASK_ID,
+        mode='interval',
+        interval_days=3,
+        anchor_date='',           # default value
+        interval_has_deadline=True,  # default value
+        interval_hour=8,
+        interval_minute=0,
+    )
+    upsert_schedule(old_style)
+
+    # Manually wipe the new fields from the raw stored record to simulate a pre-phase-2 record
+    from db.db import chore_schedules_db
+    from tinydb import Query
+    ScheduleQ = Query()
+    record = chore_schedules_db.search(
+        (ScheduleQ.child_id == TEST_CHILD_ID) & (ScheduleQ.task_id == TEST_TASK_ID)
+    )[0]
+    doc_id = chore_schedules_db.get(
+        (ScheduleQ.child_id == TEST_CHILD_ID) & (ScheduleQ.task_id == TEST_TASK_ID)
+    ).doc_id
+    chore_schedules_db.update(
+        lambda rec: (
+            rec.pop('anchor_date', None),
+            rec.pop('interval_has_deadline', None),
+        ),
+        doc_ids=[doc_id],
+    )
+
+    resp = client.get(f'/child/{TEST_CHILD_ID}/task/{TEST_TASK_ID}/schedule')
+    assert resp.status_code == 200
+    data = resp.get_json()
+    assert data['anchor_date'] == ''
+    assert data['interval_has_deadline'] is True
+
+
 # ---------------------------------------------------------------------------
 # DELETE schedule
 # ---------------------------------------------------------------------------