fix(workflow): change node version

.gitea/workflows/lint.yml

@@ -28,8 +28,14 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
-          cache: 'yarn'
+          node-version: '25'
+          # We handle caching manually below to ensure
+          # corepack-managed yarn is used correctly.
+
+      - name: Enable Corepack
+        run: |
+          corepack enable
+          corepack prepare yarn@stable --activate
 
       - name: Get yarn cache directory path
         id: yarn-cache-dir-path