Add pnpm setup and Node dependency installation to lint workflow

.github/workflows/lint.yml

@@ -22,16 +22,24 @@ jobs:
         with:
           node-version: 20
 
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10
+
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
           python-version: 3.11
 
-      - name: Install dependencies
+      - name: Install Python dependencies
         run: |
           pip install uv
           uv sync
 
+      - name: Install Node dependencies
+        run: pnpm install --frozen-lockfile
+
       # Python checks (isort, black, ruff, mypy)
       - name: Python lint & typecheck
         run: |