feat(map): add event-driven GPS update

src/hooks/useRealtimeGps.ts

@@ -0,0 +1,19 @@
+// src/hooks/useRealtimeGps.ts
+import { useEffect, useState } from 'react';
+import { eventBus } from '@/utils/eventBus';
+
+export default function useRealtimeGps() {
+  const [gpsData, setGpsData] = useState<API.GPSResonse | null>(null);
+
+  useEffect(() => {
+    const handleGpsUpdate = (data: API.GPSResonse) => {
+      setGpsData(data);
+    };
+    eventBus.on('gpsData:update', handleGpsUpdate);
+
+    // cleanup khi unmount
+    return () => eventBus.off('gpsData:update', handleGpsUpdate);
+  }, []);
+
+  return gpsData;
+}