- Update input handling to retain SDL_TEXTINPUT after Tab insertion for better platform consistency.
- Allow multiple app instances in macOS by modifying `Info.plist`.
- Bump version to 1.3.8-alpha.
- Add visual file picker for GUI with toggle support.
- Introduce `GUIConfig` class for loading GUI settings from configuration file.
- Refactor window initialization to support dynamic sizing based on configuration.
- Add macOS-specific handling for fullscreen behavior.
- Improve header inclusion order and minor code cleanup.