Refactor HTTPInterceptor to handle error responses and add a CustomSnackBar
helper to display snack bars. This will improve error handling and user
feedback in the application.
- Refactor device control logic in the app to improve readability and maintainability.
- Add temperature modes (hot, cold, wind) and fan speeds (auto, low, middle, high) enums.
- Update icon mappings and utility functions for temperature modes and fan speeds.
Update email and password validation logic in the LoginForm widget to only
perform validation when the state is not AuthTokenError. This ensures that
validation is skipped when there is an authentication token error.
