- Changed view mode shortcuts from Alt+1/2/3 to Cmd+1/2/3 (Alt+N produces
special chars on macOS, e.g. Alt+1 → '¡')
- menu.rs: use MenuItemBuilder with .accelerator() instead of appending
shortcut text to label (was purely decorative, not registered with OS)
- Shortcuts now: CmdOrCtrl+1 editor-only, +2 editor+list, +3 all panels