Reorder CI steps to match original order

Move playwright install after backend build so all dependency/build
steps run first, then browser install, then test execution.

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

.github/workflows/pull-e2e-tests.yml

@@ -33,9 +33,9 @@ jobs:
           cache-dependency-path: pnpm-lock.yaml
       - run: make deps-frontend
       - run: make frontend
-      - run: make playwright
       - run: make deps-backend
       - run: make gitea-e2e
+      - run: make playwright
       - run: make test-e2e
         timeout-minutes: 10
         env: