⇧⌘N opens the New Layer dialog, as Layer › New › Layer… does in Photoshop.
Photoshop's companion shortcut, the same keys with ⌥ (Ctrl+Alt+Shift+N on
Windows and Linux), makes the layer at once; PhotoCraft didn't handle it,
so there was no way to get 0.7.0's dialog-free behaviour from the keyboard.
New Layer's shortcut with ⌥ added now runs layer.new.layer directly. It
follows a rebound New Layer shortcut, and a command bound to that key
itself keeps it.
Fixes#4794
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>