Person detection via direct MQTT instead of HA entities

- Electron main process subscribes to Frigate's MQTT topics
  (frigate/<camera>/person and frigate/events) directly via mqtt.js,
  bypassing the broken HA MQTT integration
- Watched cameras: Front_Porch, FPE, Porch_Downstairs, Driveway_door
- On person detection, exits photo-frame idle and shows full-screen
  camera feed for 30 seconds
- Removed HA entity-based person detection code (entityToCameraName,
  personDetectionEntities config dependency)
- Deleted unused useFrigateDetection HTTP polling hook (superseded)

package.json

@@ -18,26 +18,27 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "home-assistant-js-websocket": "^9.4.0",
-    "zustand": "^4.5.0",
-    "googleapis": "^131.0.0",
-    "@tensorflow/tfjs": "^4.17.0",
     "@tensorflow-models/coco-ssd": "^2.2.3",
+    "@tensorflow/tfjs": "^4.17.0",
+    "date-fns": "^3.3.1",
     "electron-store": "^8.1.0",
-    "date-fns": "^3.3.1"
+    "googleapis": "^131.0.0",
+    "home-assistant-js-websocket": "^9.4.0",
+    "mqtt": "^5.15.1",
+    "zustand": "^4.5.0"
   },
   "devDependencies": {
     "@types/node": "^20.11.0",
     "@types/react": "^18.2.48",
     "@types/react-dom": "^18.2.18",
+    "@typescript-eslint/eslint-plugin": "^6.19.0",
+    "@typescript-eslint/parser": "^6.19.0",
     "@vitejs/plugin-react": "^4.2.1",
     "autoprefixer": "^10.4.17",
     "concurrently": "^8.2.2",
     "electron": "^28.2.0",
     "electron-builder": "^24.9.1",
     "eslint": "^8.56.0",
-    "@typescript-eslint/eslint-plugin": "^6.19.0",
-    "@typescript-eslint/parser": "^6.19.0",
     "eslint-plugin-react-hooks": "^4.6.0",
     "postcss": "^8.4.33",
     "react": "^18.2.0",