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/models/chore_schedule.py

@@ -37,8 +37,9 @@ class ChoreSchedule(BaseModel):
     default_minute: int = 0  # master deadline minute for 'days' mode
 
     # mode='interval' fields
-    interval_days: int = 2          # 2–7
-    anchor_weekday: int = 0         # 0=Sun–6=Sat
+    interval_days: int = 2              # 1–7
+    anchor_date: str = ""               # ISO date string e.g. "2026-02-25"; "" = use today
+    interval_has_deadline: bool = True  # False = "Anytime" (no deadline)
     interval_hour: int = 0
     interval_minute: int = 0
 
@@ -52,7 +53,8 @@ class ChoreSchedule(BaseModel):
             default_hour=d.get('default_hour', 8),
             default_minute=d.get('default_minute', 0),
             interval_days=d.get('interval_days', 2),
-            anchor_weekday=d.get('anchor_weekday', 0),
+            anchor_date=d.get('anchor_date', ''),
+            interval_has_deadline=d.get('interval_has_deadline', True),
             interval_hour=d.get('interval_hour', 0),
             interval_minute=d.get('interval_minute', 0),
             id=d.get('id'),
@@ -70,7 +72,8 @@ class ChoreSchedule(BaseModel):
             'default_hour': self.default_hour,
             'default_minute': self.default_minute,
             'interval_days': self.interval_days,
-            'anchor_weekday': self.anchor_weekday,
+            'anchor_date': self.anchor_date,
+            'interval_has_deadline': self.interval_has_deadline,
             'interval_hour': self.interval_hour,
             'interval_minute': self.interval_minute,
         })