ci: add UI type-check and build job to CI and release workflows

.gitea/workflows/release.yaml

@@ -43,11 +43,36 @@ jobs:
       - name: Run tests
         run: go test -race -count=1 -timeout=60s ./...
 
+  # ── ui: type-check & build ───────────────────────────────────────────────────
+  ui:
+    name: UI
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ui
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          cache-dependency-path: ui/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Type check
+        run: npm run check
+
+      - name: Build
+        run: npm run build
+
   # ── build & release ──────────────────────────────────────────────────────────
   release:
     name: Release
     runs-on: ubuntu-latest
-    needs: [lint, test]
+    needs: [lint, test, ui]
     steps:
       - uses: actions/checkout@v4