Executor now applies rotation, flip, resize, watermark, format
conversion, compression, renaming, and metadata handling. Previously
only resize, convert, and compress were active.
- Rotation: CW90/180/270 via image crate methods
- Flip: horizontal/vertical via image crate methods
- Watermark: text (imageproc + ab_glyph) and image overlay with
alpha blending, positioned via WatermarkPosition enum
- Rename: apply_simple or template-based renaming with counter
- Metadata: re-encoding strips EXIF; KeepAll copies back via little_exif
- Settings menu opens PreferencesDialog
- History menu shows HistoryStore entries in a dialog
- Add Files (Ctrl+O) opens FileDialog with image MIME filters
- Process button runs PipelineExecutor in background thread
- Progress bar updates via mpsc channel polled with glib timeout
- Cancel button sets AtomicBool flag to stop processing
- Results page shows real stats (images, sizes, savings, time)
- Open Output Folder launches default file manager
- Process Another Batch resets wizard to step 1
- Toast notifications via ToastOverlay for feedback
- History entries saved after each processing run
- Remove dead_code allows from processing.rs and settings.rs
