Chinese/Japanese/Korean IMEs emit keydown events during composition that
carry preedit keystrokes and the commit keypress (Enter/Space/Shift for
candidate selection). Treating them as combos fires unrelated keybinds —
e.g. typing 你 with a CJK IME could dispatch session.new and silently
open a new session.
Guard comboFromEvent():
- Bail out entirely while composing (event.isComposing or key === 'Process')
- Ignore keydowns whose event.key is a bare modifier name but whose code
is a regular key — legacy IMEs that synthesize keystrokes (Q9 2002 sends
key="Control" with code="KeyW") would otherwise canonicalize into
phantom combos like mod+w that close the active tab.
Tested with Q9 (九方) legacy IME on Windows.
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