New workflow summary page for Depot CI

Depot CI workflow runs now open in a new summary view that shows what ran, what failed, and where to look next.

The summary page gives you the run context, the overall result, and a timeline of every job in the workflow. From there, you can filter jobs by status, compare durations, retry failed jobs, and open the job detail view for logs, outputs, metrics, and attempts.

When several jobs fail in the same step or with the same error, Depot groups them together. This is especially useful for matrix jobs, where one failure can affect several shards or environments.

The workflow list has also been reorganized around runs and repositories, so it's easier to scan recent activity and keep your place as you move between a workflow summary and individual jobs.