use pnpm for Desktop Electron App (#7679)

.github/workflows/pr-smoke-test.yml

@@ -267,7 +267,7 @@ jobs:
         run: chmod +x target/debug/goosed
 
       - name: Install Node.js Dependencies
-        run: source ../../bin/activate-hermit && npm ci
+        run: source ../../bin/activate-hermit && pnpm install --frozen-lockfile
         working-directory: ui/desktop
 
       - name: Run Integration Tests
@@ -279,5 +279,5 @@ jobs:
           SHELL: /bin/bash
         run: |
             echo 'export PATH=/some/fake/path:$PATH' >> $HOME/.bash_profile
-            source ../../bin/activate-hermit && npm run test:integration:debug
+            source ../../bin/activate-hermit && pnpm run test:integration:debug
         working-directory: ui/desktop