Fix case mismatch in PersonAlert camera lookup

cameraName from MQTT was compared against lowercased frigateCamera
without being lowercased itself — Front_Porch !== front_porch.

src/App.tsx

@@ -23,8 +23,9 @@ import { env } from '@/config/environment';
 // Person detection alert overlay - shows for 30 seconds when person detected on any configured camera
 function PersonAlert({ cameraName, onClose }: { cameraName: string; onClose: () => void }) {
   const cameras = useSettingsStore((state) => state.config.cameras);
+  const cameraLower = cameraName.toLowerCase();
   const camera = cameras.find(
-    (c) => c.frigateCamera?.toLowerCase() === cameraName || c.name.toLowerCase() === cameraName,
+    (c) => c.frigateCamera?.toLowerCase() === cameraLower || c.name.toLowerCase() === cameraLower,
   );
 
   useEffect(() => {