fix: improve maintenance and synchronize live conversations

frontend/vite.config.ts

@@ -14,8 +14,7 @@ import { THEME_COLORS } from './src/config/themeColors'
 export default defineConfig(({ command, mode }) => {
   // Load env file based on `mode` in the current working directory.
   // When mode is 'prod' or 'dev', load .env.prod or .env.dev respectively
-  let envDir = process.cwd()
-  let envFile = '.env'
+  const envDir = process.cwd()
   
   if (mode === 'prod' || mode === 'production') {
     // Manually load .env.prod for production builds. Plain `vite build`