ci(client): update Node.js version to 22.x for tests

- Upgrade node-version from 18.x to 22.x in client.yml to support Vite 7/ESLint 9 dependencies

Author: reiroop

.github/workflows/client.yml

@@ -87,7 +87,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v6
         with:
-          node-version: 18.x
+          node-version: 22.x
       - uses: actions/checkout@v6
       - uses: actions/cache@v4
         with: