v1.6.3

- **Bugfix (FilePicker)**: Fixed `FilePicker` deprecation warning and `offsetWidth` error for Foundry V13+ by implementing robust V13-compatible initialization.
- **Bugfix (FilePicker)**: Fixed an issue where the FilePicker could open twice or trigger duplicate events.
- **UI Improvement**: Changed the "Upload Portrait" button to **"Select Image"** with a folder icon, ensuring consistency with the Background selection UI.