The ctrl fast path unconditionally returned after calling ghostty_surface_key,
even when it returned false (e.g. ignore keybindings), preventing IMEs from
receiving Ctrl-modified key events. Now falls through to interpretKeyEvents
when the key is not handled.
Also adds keyboard layout change detection around interpretKeyEvents (matching
Ghostty upstream) so that IME-triggered layout switches cause an early return
instead of sending the key to Ghostty.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
