ci: add missing server build step to playwright job

The Playwright e2e helpers dynamically import from
packages/server/dist/server/server/exports.js, but the CI job
only built highlight and relay dependencies. Add the server build
step after relay so the dist artifacts exist when tests run.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -116,6 +116,9 @@ jobs:
       - name: Build relay dependency
         run: npm run build --workspace=@getpaseo/relay
 
+      - name: Build server dependency
+        run: npm run build --workspace=@getpaseo/server
+
       - name: Run Playwright E2E tests
         run: npm run test:e2e --workspace=@getpaseo/app
         env: