fix(web): change port to 3007, add auto port cleanup, graceful error handling

web/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "scripts": {
     "dev": "concurrently \"npm run dev:server\" \"npm run dev:client\"",
+    "predev:server": "npx kill-port 3007",
     "dev:server": "tsx watch server/index.ts",
     "dev:client": "vite --config client/vite.config.ts",
     "build": "vite build --config client/vite.config.ts",
@@ -36,6 +37,7 @@
     "@vitejs/plugin-react": "^4.3.0",
     "autoprefixer": "^10.4.0",
     "concurrently": "^9.1.0",
+    "kill-port": "^2.0.1",
     "postcss": "^8.4.0",
     "tailwindcss": "^3.4.0",
     "tsx": "^4.19.0",