perf: speed up e2e tests in CI

- Pre-build before Playwright instead of building inside webServer
- Reduce retries from 2 to 1 (fix flaky tests instead of masking them)
- Set CI workers to 4 for more parallelism
- Reduce artifact retention from 30 to 7 days

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

.github/workflows/ci.yml

@@ -80,6 +80,12 @@ jobs:
         if: steps.playwright-cache.outputs.cache-hit == 'true'
         run: npx playwright install-deps chromium
 
+      - name: Build
+        run: pnpm build
+        env:
+          DATABASE_URL: ./data/test-crumbs.db
+          NODE_ENV: test
+
       - run: pnpm test:e2e
         env:
           CI: true
@@ -91,7 +97,7 @@ jobs:
           path: |
             playwright-report/
             test-results/
-          retention-days: 30
+          retention-days: 7
 
   docker-build:
     name: Docker Build