)

- Rewrite the theme manager to directly mutate the value of GPT theme in local storage, eliminating the need for storage.sync
- Ensure that theme changes from GPT settings are now reflected in the floating theme and are in sync
- Note: There is a small issue with dark and accent themes on the "/share/*" page due to overriding code

Changes summary:
- Improved the theme management system:
  - Replaced the use of storage.sync with direct mutation of the GPT theme value in local storage, enhancing performance and reliability.
  - Ensured that theme changes from GPT settings are now properly reflected in the floating theme, maintaining a consistent user experience.
  - Identified a minor issue with dark and accent themes on the "/share/*" page, which will require further attention to resolve the overriding code.

… unnecessary keys that were previously used for theme management

- Remove left storage.sync keys related to theme management, as they are no longer needed with the switch to storage.local

Changes summary:
- Removed obsolete storage.sync keys:
  - Cleaned up storage by removing unnecessary keys that were previously used for theme management, ensuring a more organized and efficient storage system.

- Replace the long if statement with a more concise and readable version using Object.values(THEMES).includes(themeButtonID)

Changes summary:
- Simplified the theme button ID check:
  - Replaced a lengthy if statement with a more efficient and readable version, improving code maintainability and reducing complexity.