Add master display UI with audio output management and styling

- Implement main.js for the master display functionality, including WebSocket connection, audio output management, and state handling.
- Create style.css for the master display's visual design, ensuring a cohesive look and feel with a dark theme and responsive layout.
- Integrate device management with a fallback for non-Electron environments, allowing users to select audio outputs.
- Add features for managing favorites, including toggling favorites and filtering by genre.
- Enhance user experience with a responsive favorites grid and drag-to-scroll functionality.

package.json

@@ -10,7 +10,8 @@
         "dev:api": "node --watch server/index.js",
         "build": "vite build",
         "start": "node server/index.js",
-        "seed": "node server/scripts/seed.js"
+        "seed": "node server/scripts/seed.js",
+        "images:fetch": "node server/scripts/download-images.js"
     },
     "dependencies": {
         "bcryptjs": "^2.4.3",