The 100ms timeout was causing Kitty protocol detection to fail when the
terminal response was delayed (e.g., due to event loop blocking during
startup). This resulted in shift+enter not working in some scenarios.
Changes:
- Remove timeout-based Kitty detection, process input immediately
- Detect Kitty response in stdinBuffer output (handles split data)
- Add modifyOtherKeys fallback for terminals without Kitty support
(matches xterm format \x1b[27;modifier;keycode~)
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