chore: 3p import fix (#461)

Author: OrKoN

src/utils/keyboard.ts

@@ -3,7 +3,7 @@
  * Copyright 2025 Google LLC
  * SPDX-License-Identifier: Apache-2.0
  */
-import type {KeyInput} from '../third_party';
+import type {KeyInput} from '../third_party/index.js';
 
 // See the KeyInput type for the list of supported keys.
 const validKeys = new Set([