Improvements and Additions:
- Theme: Added a basic theme to improve the visual consistency of the app.
- Search Engine Options: Added more search engines, including WolframAlpha, Brave, Ecosia, Startpage, and Qwant.
- Form Validation: Added form validation for the search query input.
- Advanced Options: Added a "Settings" button to the app bar, which reveals advanced options like premium features and bug reporting.
- Premium Feature Descriptions: Added more descriptive text for the premium features.
- Mobile/Desktop Layout: Optimized the layout for both mobile and desktop devices.
- User-Friendly UI: Improved the overall UI by adding more padding, making text more readable, and improving the layout of components.
- Clearer Explanation: Enhanced comments and explanations in the code to make it easier to understand.