ci: build frontend before Python wheel in release pipeline

The hatch build hook bundles frontend/dist into the wheel as
fourdpocket/static. Without building the frontend first, the
PyPI wheel ships without the UI.

Author: prakersh

.github/workflows/release.yml

@@ -177,6 +177,18 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install pnpm
+        run: corepack enable
+
+      - name: Build frontend
+        working-directory: frontend
+        run: pnpm install --frozen-lockfile && pnpm build
+
       - name: Install build tools
         run: pip install build