- Remove unused `patch` import from test_output_dir.py
- Add debug log message to ImportError handler instead of bare pass
- Invalidate gallery file listing cache alongside output dir cache
when the user changes gallery_root_path in settings
_find_comfyui_output_dir() now checks GalleryConfig.MONITORING_DIRECTORIES
first before falling back to filesystem auto-detection. Also invalidates
the cached directory when the user changes the setting via save_settings().
Closes#108