Refactored the bidding application by reorganizing the file structure and extracting CSS into separate files.
- The monolithic `control.html` and `display.html` files have been moved into dedicated `controls/` and `display/`
directories.
- All inline CSS has been extracted into component-specific `style.css` files.
- A new `common/style.css` has been created to hold shared styles, promoting reusability and reducing duplication.
These changes improve the project's modularity, separation of concerns (HTML/CSS), and long-term maintainability without
affecting external behavior.
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