Add global debug key (Shift+Ctrl+D), iterative tree sorting to avoid stack overflow

packages/tui/src/keys.ts

@@ -320,6 +320,14 @@ export function isShiftCtrlP(data: string): boolean {
 	return matchesKittySequence(data, CODEPOINTS.p, MODIFIERS.shift + MODIFIERS.ctrl);
 }
 
+/**
+ * Check if input matches Shift+Ctrl+D (Kitty protocol only, for debug).
+ * Ignores lock key bits.
+ */
+export function isShiftCtrlD(data: string): boolean {
+	return matchesKittySequence(data, CODEPOINTS.d, MODIFIERS.shift + MODIFIERS.ctrl);
+}
+
 /**
  * Check if input matches Ctrl+T (raw byte or Kitty protocol).
  * Ignores lock key bits.