fix: suppress input text for kitty release events

Release events now produce empty input to prevent character duplication
when reportEventTypes flag is enabled. key.eventType is still passed
through so handlers can detect release events.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/runtime/src/composables/useInput.ts

@@ -70,7 +70,9 @@ export function useInput(
 
     let input: string;
     if (keypress.isKittyProtocol) {
-      if (keypress.isPrintable) {
+      if (keypress.eventType === "release") {
+        input = "";
+      } else if (keypress.isPrintable) {
         input = keypress.text ?? keypress.name;
       } else if (keypress.ctrl && keypress.name.length === 1) {
         input = keypress.name;