Add TypeScript types for turndown library

- Added @types/turndown dev dependency for production build
- Fixes TypeScript compilation errors during build process

package.json

@@ -27,6 +27,7 @@
     "@tauri-apps/cli": "^2",
     "@types/react": "^19.1.8",
     "@types/react-dom": "^19.1.6",
+    "@types/turndown": "^5.0.6",
     "@vitejs/plugin-react": "^4.6.0",
     "autoprefixer": "^10.4.27",
     "postcss": "^8.5.8",