[iOS] Keyboard shortcuts

Thanks! Sounds like a good start.

Some context: Recently many iPad Pro users use external keyboards and then effectively use the iPad more like a laptop than a tablet. You usually also don’t have a pointing device like touchpad/mouse in this setup (although this is changing recently with the Magic Keyboard accessory). Thus, navigational keyboard shortcuts help quite a bit.

Also, if possible most shortcuts should be shared between desktop (macOS) and iPadOS, so it is easier to switch between devices.