fix(ci): run deploy tests under xvfb for headed extension e2e

Extension e2e now launches Chromium in headed mode so extension service workers initialize reliably. In GitHub Actions, that requires an X server.

Run the deploy test job via xvfb-run so headed Playwright sessions have a virtual display, while keeping browser installation apt-free (playwright install chromium).

Author: hugbubby

.github/workflows/deploy.yml

@@ -301,7 +301,7 @@ jobs:
         run: pnpm db:generate
 
       - name: Run tests
-        run: pnpm test
+        run: xvfb-run -a pnpm test
 
   build:
     needs: [resolve-target, decide-deploy]