Keyboard accelerators (copy/paste/save/undo/new/open) were gated on
`Modifiers::control()`, which on macOS matches only the physical Control
key. Mac users pressing Cmd+C/V/S/Z got nothing, contrary to platform
convention and every other Mac app.
Switch the gate to `Modifiers::command()`, which iced resolves to the
Logo (Cmd) key on macOS and Ctrl on Windows/Linux. On non-mac targets
this expands to exactly `control()`, so behavior there is unchanged.
Also make the Keyboard Shortcuts reference window display the
platform-correct modifier name (Cmd vs Ctrl) so the help matches the
keys the user actually presses.
Closes#202
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
73eabc3aaa