fix: add vite-env.d.ts for ?worker import type declarations

TypeScript needs type declarations for Vite's ?worker import suffix
used by Monaco editor web workers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: DLhugly

clif-pad-ide/src/vite-env.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="vite/client" />
+
+declare module "*?worker" {
+  const workerConstructor: new () => Worker;
+  export default workerConstructor;
+}