- Implement chunked put_image for images exceeding X11 max request size
- Remove initial render before event loop to avoid stale dimensions
- Add surface/window size verification before blitting
- Pass parent_window to picker for transient-for hint

- Add --save and --save-filename CLI args for save dialogs
- Add SaveFile variant to PickerMode enum
- Add filename textbox to picker toolbar with editing support
- Portal spawn_save_picker passes filename to garfield
- Portal finds garfield in ~/.cargo/bin first for development
- Improved focus highlighting on filename textbox

- throttle render requests during drag to ~60fps
- add visible_indices cache to avoid repeated allocations
- pre-compute colors and font sizes outside render loop
- call final selection update in stop_drag before clearing state
- add select_by_path to Tab for selecting renamed files
- add lightweight status bar update for drag operations