- 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
- Create menu.rs module with View submenu
- Items: Editor Only (⌥1), Editor + Notes (⌥2), All Panels (⌥3)
- Emits 'menu-event' to frontend, handled by useViewMode hook
- Menu only created on desktop builds (#[cfg(desktop)])
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
