FE: Filter and sort comparison rows

[alanpeixinho]

Summary

Filter and sort rows on AB comparison tables (builds, boots, tests).

Details

Filters (single-select):

• All — every matched row across Side A and Side B, including unchanged (status_a === status_b)
• Only changes — status_a ≠ status_b (default)
• Regressions — PASS → FAIL
• Fixes — FAIL → PASS
• Appeared — null → status (present only on Side B)
• Disappeared — status → null (present only on Side A)

Out of scope: INCONCLUSIVE transitions as dedicated filters (still visible under All / Only changes).

Sort: by table columns (boots/tests: path, config, platform, Side A/B; builds: config, arch, compiler, Side A/B). Default TBD (e.g. regressions first, then path/config asc).

Scope

• Diff-only filters can be client-side over compare response
• All needs full join of both sides (unchanged rows not in diff endpoints) — either extend compare API with include_unchanged / dedicated full payload, or join existing per-commit tree data on FE
• Filter choice persists across tab switches for same A/B selection (URL or shared state — align with FE: Comparison page (picker + summary) #2010 URL-state decision)
• Headlines (FE: Comparison page (picker + summary) #2010) stay unfiltered: always full-diff regression + fix totals

Done when

• All / Only changes / Regressions / Fixes / Appeared / Disappeared switches update table
• Column sort works
• Headlines independent of table filter