chore: update package.json and refactor terminal WebSocket connection handling

- Added a postinstall script in package.json to set permissions for spawn-helper on macOS.
- Refactored the terminal WebSocket connection handling in index.ts for improved readability and consistency.
- Enhanced error logging and connection management in the terminal service.
- Cleaned up formatting and indentation across multiple files for better code clarity.

package.json

@@ -7,6 +7,7 @@
     "libs/*"
   ],
   "scripts": {
+    "postinstall": "node -e \"const fs=require('fs');if(process.platform==='darwin'){['darwin-arm64','darwin-x64'].forEach(a=>{const p='node_modules/node-pty/prebuilds/'+a+'/spawn-helper';if(fs.existsSync(p))fs.chmodSync(p,0o755)})}\"",
     "dev": "npm run dev --workspace=apps/app",
     "dev:web": "npm run dev:web --workspace=apps/app",
     "dev:electron": "npm run dev:electron --workspace=apps/app",