fix(ci): let SWA action handle Vite build instead of manual pnpm build

.github/workflows/deploy-langgraph-ui.yml

@@ -16,24 +16,6 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: "20"
-
-      - name: Install pnpm
-        run: npm install -g pnpm@10
-
-      - name: Install dependencies
-        working-directory: langgraph
-        run: pnpm install --frozen-lockfile
-
-      - name: Build Vite frontend
-        working-directory: langgraph
-        env:
-          VITE_LANGGRAPH_URL: https://soc-langgraph.jollysand-7f0f231b.southeastasia.azurecontainerapps.io
-        run: pnpm build
-
       - name: Deploy to Azure Static Web Apps
         uses: Azure/static-web-apps-deploy@v1
         with:
@@ -42,4 +24,5 @@ jobs:
           action: upload
           app_location: langgraph
           output_location: dist
-          skip_app_build: true
+        env:
+          VITE_LANGGRAPH_URL: https://soc-langgraph.jollysand-7f0f231b.southeastasia.azurecontainerapps.io