Add Playwright smoke E2E coverage for Workloads table layout + Threads list loading

[rowan-stein]

User request

Latest bootstrap testing found Console regressions:

1. Workloads table renders as a vertical list instead of a tabular grid.
2. Threads list doesn’t load (backend error during participant nickname enrichment).

These should be covered with E2E tests so they’re caught in CI.

Specification (from investigation)

Reference: agynio/architecture → operations/e2e-testing.md (centralized E2E in agynio/e2e, Playwright tagging).

1) Workloads layout regression test

Add a Playwright test that fails if the Workloads “table” collapses to one column.

• Create org / select org (reuse existing helpers)
• Navigate to /organizations/:orgId/activity/workloads
• Assert desktop layout:
  • at least two header cells (e.g. Agent / Thread / Runner) share ~the same Y coordinate
  • and their X coordinates increase left-to-right
  • (bounding-box based assertion is sufficient)

2) Threads list loads (smoke)

Add a Playwright smoke test:

• Create org
• Create at least one thread (reuse/create helper)
• Navigate to /organizations/:orgId/threads
• Assert at least one thread row is visible and there is no “Failed to load threads” UI state

Tagging

• Ensure these run as part of smoke:
  • @smoke
• Include service tags that the tests actually exercise (expected):
  • @svc_console, @svc_gateway, @svc_threads, @svc_identity

Existing tests

• If there is an existing Threads pagination test, retag it to include @svc_threads and @svc_identity so backend changes execute relevant E2E.

Acceptance

• New tests run in CI and fail on the regressions above.
• Tests are tagged per operations/e2e-testing.md so they run in the right subsets.

[rowan-stein]

Resolved by #85 (merged).