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macos: suppress control-char input while composing When AppKit delivers a single C0 control character during marked-text composition, Ghostty should treat it as input consumed by the composing state instead of forwarding it to the terminal. This prevents control-key IME actions, such as Japanese input shortcuts like ctrl+h/j/m/n, from leaking into the terminal while composition is still active. Printable text and non-composing control input continue through the normal key path. Refs #10460 Related: #2628, #4539 Vouched in #12169 Testing: - xcodebuild test -scheme Ghostty -destination platform=macOS -only-testing:GhosttyTests/SurfaceViewAppKitTests - Manually tested Japanese IME control-key shortcuts on macOS AI usage: - OpenAI Codex helped investigate, implement, test, and refine this change. I reviewed and tested the resulting code.