feat: add parent PIN setup functionality and email notifications

- Implemented User model updates to include PIN and related fields.
- Created email sender utility for sending verification and reset emails.
- Developed ParentPinSetup component for setting up a parent PIN with verification code.
- Enhanced UserProfile and EntityEditForm components to support new features.
- Updated routing to include PIN setup and authentication checks.
- Added styles for new components and improved existing styles for consistency.
- Introduced loading states and error handling in various components.

backend/models/user.py

@@ -13,6 +13,9 @@ class User(BaseModel):
     reset_token: str | None = None
     reset_token_created: str | None = None
     image_id: str | None = None
+    pin: str = ''
+    pin_setup_code: str = ''
+    pin_setup_code_created: str | None = None
 
     @classmethod
     def from_dict(cls, d: dict):
@@ -27,6 +30,9 @@ class User(BaseModel):
             reset_token=d.get('reset_token'),
             reset_token_created=d.get('reset_token_created'),
             image_id=d.get('image_id'),
+            pin=d.get('pin', ''),
+            pin_setup_code=d.get('pin_setup_code', ''),
+            pin_setup_code_created=d.get('pin_setup_code_created'),
             id=d.get('id'),
             created_at=d.get('created_at'),
             updated_at=d.get('updated_at')
@@ -45,6 +51,9 @@ class User(BaseModel):
             'verify_token_created': self.verify_token_created,
             'reset_token': self.reset_token,
             'reset_token_created': self.reset_token_created,
-            'image_id': self.image_id
+            'image_id': self.image_id,
+            'pin': self.pin,
+            'pin_setup_code': self.pin_setup_code,
+            'pin_setup_code_created': self.pin_setup_code_created
         })
         return base