fix: suppress vite plugin type mismatch in vitest config

Author: jotel-dev

frontend/vitest.config.mts

@@ -3,6 +3,7 @@ import react from '@vitejs/plugin-react';
 import path from 'path';
 
 export default defineConfig({
+  // @ts-expect-error type mismatch between vite versions in monorepo
   plugins: [react()],
   resolve: {
     alias: {