Fix Escape key handling for Kitty keyboard protocol

Add isEscape() helper that handles both raw (\x1b) and Kitty protocol
(\x1b[27u) Escape sequences. Update all components that check for
Escape key to use the new helper.

packages/tui/src/index.ts

@@ -31,6 +31,7 @@ export {
 	isCtrlT,
 	isCtrlU,
 	isCtrlW,
+	isEscape,
 	isShiftTab,
 	Keys,
 } from "./keys.js";