The summary step previously linked to the run's /artifacts page generically.
Now it links the specific artifact download URLs from each upload step's
artifact-url output. Reordered the steps so uploads run before the summary
(since the summary needs their outputs), and added id: to each upload step.
Each artifact gets its own clickable link:
- playwright-test-results (all screenshots + traces)
- playwright-report (interactive HTML report)
- visual-diffs (just the diffed screenshots, PR-only)
2eb320a7bf