Refactor proxy codebase

apps/yaak-proxy/hooks/useRpcEvent.ts

@@ -0,0 +1,15 @@
+import type { RpcEventSchema } from '@yaakapp-internal/proxy-lib';
+import { useEffect } from 'react';
+import { listen } from '../lib/rpc';
+
+/**
+ * Subscribe to an RPC event. Cleans up automatically on unmount.
+ */
+export function useRpcEvent<K extends keyof RpcEventSchema>(
+  event: K & string,
+  callback: (payload: RpcEventSchema[K]) => void,
+) {
+  useEffect(() => {
+    return listen(event, callback);
+  }, [event, callback]);
+}