Added SSE function and add readAt for notification

src/hooks/use-sse.ts

@@ -0,0 +1,24 @@
+import { useEffect } from 'react';
+
+export function useSSE(onMessage: (data: any) => void) {
+  useEffect(() => {
+    const eventSource = new EventSource('/api/notify');
+
+    eventSource.onmessage = (event) => {
+      try {
+        const parsed = JSON.parse(event.data);
+        onMessage(parsed);
+      } catch (err) {
+        console.error('Invalid SSE data', err);
+      }
+    };
+
+    eventSource.onerror = () => {
+      eventSource.close();
+    };
+
+    return () => {
+      eventSource.close();
+    };
+  }, [onMessage]);
+}