feat: Implement routines feature with CRUD operations and child assignment

- Add backend routines management with add, get, update, delete, and list functionalities.
- Create models for Routine, RoutineItem, RoutineSchedule, and RoutineExtension.
- Develop event types for routine confirmation and modification.
- Implement frontend components for routine assignment, confirmation dialog, and routine management views.
- Add unit tests for routine API and integration tests for routine CRUD flow.
- Create end-to-end test plan for routines feature covering parent and child interactions.

backend/api/child_override_api.py

@@ -2,7 +2,7 @@ from flask import Blueprint, request, jsonify
 from tinydb import Query
 from api.utils import get_validated_user_id, send_event_for_current_user
 from api.error_codes import ErrorCodes
-from db.db import child_db, task_db, reward_db
+from db.db import child_db, task_db, reward_db, routine_db
 from db.child_overrides import (
     insert_override,
     get_override,
@@ -52,8 +52,8 @@ def set_child_override(child_id):
         return jsonify({'error': 'custom_value is required', 'code': ErrorCodes.MISSING_FIELD, 'field': 'custom_value'}), 400
     
     # Validate entity_type
-    if entity_type not in ['task', 'reward']:
-        return jsonify({'error': 'entity_type must be "task" or "reward"', 'code': ErrorCodes.INVALID_VALUE, 'field': 'entity_type'}), 400
+    if entity_type not in ['task', 'reward', 'routine']:
+        return jsonify({'error': 'entity_type must be "task", "reward", or "routine"', 'code': ErrorCodes.INVALID_VALUE, 'field': 'entity_type'}), 400
     
     # Validate custom_value range
     if not isinstance(custom_value, int) or custom_value < 0 or custom_value > 10000:
@@ -74,7 +74,7 @@ def set_child_override(child_id):
         if entity_id not in assigned_tasks:
             return jsonify({'error': 'Task not assigned to child', 'code': ErrorCodes.ENTITY_NOT_ASSIGNED}), 404
     
-    else:  # reward
+    elif entity_type == 'reward':
         EntityQuery = Query()
         entity_result = reward_db.search(
             (EntityQuery.id == entity_id) &
@@ -87,6 +87,19 @@ def set_child_override(child_id):
         assigned_rewards = child_dict.get('rewards', [])
         if entity_id not in assigned_rewards:
             return jsonify({'error': 'Reward not assigned to child', 'code': ErrorCodes.ENTITY_NOT_ASSIGNED}), 404
+
+    else:  # routine
+        EntityQuery = Query()
+        entity_result = routine_db.search(
+            (EntityQuery.id == entity_id) &
+            ((EntityQuery.user_id == user_id) | (EntityQuery.user_id == None))
+        )
+        if not entity_result:
+            return jsonify({'error': 'Routine not found', 'code': 'ROUTINE_NOT_FOUND'}), 404
+
+        assigned_routines = child_dict.get('routines', [])
+        if entity_id not in assigned_routines:
+            return jsonify({'error': 'Routine not assigned to child', 'code': ErrorCodes.ENTITY_NOT_ASSIGNED}), 404
     
     # Create and insert override
     try: