- Renamed variable `dpipOK` to `isSupported` for clarity in checking Document Picture-in-Picture support.
- Updated the `open` function to use the new `isSupported` variable.
- Removed redundant checks in the `close` function related to Document Picture-in-Picture support.
- Added `isSupported` and `isActive` properties to the plugin's result interface in TypeScript definitions.
- Cleaned up the code for better readability and maintainability.