Add jobs view integration tests for selection, pinning and classification

[camd]

We've had a few navigation regressions in the jobs view, so this adds more Playwright integration coverage there — particularly around job selection and the pinning / classification flow.

Changes

• mockJobsApi.js — extracts the API fixture mocking from jobs_view.spec.js into a shared helper so all jobs-view specs can use it. Extended with:
  • a real failure-classification list
  • a logged-in mode (seedLoggedInSession() + user: [SHERIFF_USER])
  • capture of POST payloads to /note/ and /bug-job-map/ so tests can assert what would be written to the backend
• job_selection.spec.js (new, 5 tests)
  • deep link with selectedTaskRun selects the job on load
  • n/p step through unclassified failures (skipping already-classified jobs) with the URL updating at each step
  • arrow keys step through all jobs regardless of status
  • Escape clears both the selection and the URL param
  • browser back after selecting a job returns to the unselected state
• pinboard_classification.spec.js (new, 6 tests)
  • pinning via spacebar, the details panel pin button, and the push header pin-all button; un-pinning
  • the b shortcut opens the related-bug input and adds a bug chip
  • saving while logged out shows the "Must be logged in" notification
  • a full logged-in classification: pin, attach a bug, save — asserting the actual /note/ and /bug-job-map/ POST payloads and that the pinboard clears afterwards
• jobs_view.spec.js (+2 tests): the u unclassified-failures filter toggle, and searchStr deep links applying the filter on initial load
• failure_summary.spec.js (new, 3 tests) — the suggestions themselves are backend logic covered by pytest (tests/model/test_error_summary.py); these cover the frontend wiring using the bug_suggestions.json fixture:
  • the failure summary is the default tab for a failed job and renders the failure line with its suggested bugs
  • pinning a suggested bug pins the job with the bug attached
  • a logged-in user can classify from a suggested bug, asserting the note and bug-job-map API payloads

Notes

• Selecting a job currently pushes two identical history entries (duplicate pushState), so a single browser-back does not deselect. The back-button test loops goBack() with a comment for now; once that is fixed the test can be tightened to a single goBack().
• The fixtures serve the same job list for every push, so a selected job lights up a copy on each push — assertions use .first().
• Playwright's hasText is case-insensitive substring matching (the classified icon's "classified" title text made 'D' match the Cpp button), so job symbols are matched with anchored regexes like /^B$/.

Testing

• pnpm test:integration: all 35 tests pass (22 jobs-view tests, run with --repeat-each=2 locally to check for flakiness)
• pnpm lint clean

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