feat(tutorial): implement comprehensive tutorial system with step guidance

- Added tutorial controller to manage tutorial state and progress.
- Introduced HelpButton component for contextual help throughout the application.
- Created various tutorial steps for onboarding and feature guidance.
- Integrated tutorial prompts in multiple components (ChildrenListView, LoginButton, ScheduleModal, etc.) to enhance user experience.
- Implemented logic to show tutorials based on user actions and state.
- Added functionality to dismiss and skip tutorial sessions.
- Established a mechanism to hydrate tutorial state from user profile.

backend/api/user_api.py

@@ -49,6 +49,8 @@ def get_profile():
         'image_id': user.image_id,
         'email_digest_enabled': user.email_digest_enabled,
         'push_notifications_enabled': user.push_notifications_enabled,
+        'tutorial_enabled': user.tutorial_enabled,
+        'tutorial_progress': user.tutorial_progress or {},
     }), 200
 
 @user_api.route('/user/profile', methods=['PUT'])
@@ -109,6 +111,37 @@ def update_profile():
     
     return jsonify({'message': 'Profile updated'}), 200
 
+@user_api.route('/user/tutorial-progress', methods=['PATCH'])
+def update_tutorial_progress():
+    user_id = get_validated_user_id()
+    if not user_id:
+        return jsonify({'error': 'Unauthorized', 'code': 'UNAUTHORIZED'}), 401
+    user = get_current_user()
+    if not user:
+        return jsonify({'error': 'Unauthorized'}), 401
+    data = request.get_json() or {}
+
+    if data.get('reset') is True:
+        user.tutorial_progress = {}
+    elif 'enabled' in data:
+        user.tutorial_enabled = bool(data.get('enabled'))
+    elif 'step_id' in data:
+        step_id = str(data.get('step_id') or '').strip()
+        if not step_id:
+            return jsonify({'error': 'Missing step_id'}), 400
+        progress = dict(user.tutorial_progress or {})
+        progress[step_id] = bool(data.get('seen', True))
+        user.tutorial_progress = progress
+    else:
+        return jsonify({'error': 'No-op'}), 400
+
+    users_db.update(user.to_dict(), UserQuery.email == user.email)
+    send_event_for_current_user(Event(EventType.PROFILE_UPDATED.value, ProfileUpdated(user.id)))
+    return jsonify({
+        'tutorial_enabled': user.tutorial_enabled,
+        'tutorial_progress': user.tutorial_progress,
+    }), 200
+
 @user_api.route('/user/image', methods=['PUT'])
 def update_image():
     user_id = get_validated_user_id()