- 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
7-step wizard flow (Workflow, Images, Resize, Convert, Compress,
Metadata, Output) with AdwNavigationView, step indicator dots,
Back/Next buttons, keyboard shortcuts (Alt+arrows, Alt+1-9),
and hamburger menu with Settings and History placeholders.
