fix(ui): drop stale repo-picker panel responses on keystroke races (#7784)

[kai392]

Summary

Four maintainer repo-picker panels (AMS cohort, AI review settings, activation preview, maintainer settings + focus-manifest editor) load on every free-text repoFullName keystroke with no stale-response guard, so a slower response for an older slug can overwrite the newer one (#7784).

This PR adds the same cancelled-flag pattern already used elsewhere (use-polled-fetch / audit-feed generation guards): each effect owns a cancelled boolean, and post-await setState is skipped when the effect has been superseded. Retry/refresh still call load() without a cancel token (manual retries are out of the keystroke-race scope).

Visual note: this is a fetch-ordering fix only — layout/CSS/copy are unchanged. Before and after screenshots are therefore pixel-identical by design; the highlighted repo picker is the surface the race affects.

Closes #7784

Scope

• The PR title follows type(scope): short summary Conventional Commit format, for example fix(api): restore profile access checks.
• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked a currently open issue this PR resolves (e.g. Closes #123) — a linked open issue is required for every contributor PR.

Validation

• git diff --check
• npm run actionlint
• npm run typecheck
• npm run test:coverage locally; codecov/patch requires ≥99% coverage of the lines AND branches you changed (aim for 100% on your diff so CI variance does not fail near the threshold). Global coverage is a non-blocking trend with a loose 90% backstop, not the gate.
• npm run test:workers
• npm run build:mcp
• npm run test:mcp-pack
• npm run ui:openapi:check
• npm run ui:lint (eslint on the five touched panel files)
• npm run ui:typecheck
• npm run ui:build
• npm audit --audit-level=moderate
• New or changed behavior has unit/integration tests for new branches, fallback paths, and sanitizer boundaries

If any required check was skipped, explain why:

• Change is confined to apps/loopover-ui (Codecov apps ignore / no src 99% patch gate). Ran package-local prettier + eslint + vitest run src/components/site/app-panels/ams-miner-cohort-card.test.tsx (9/9 pass, including the out-of-order fetch regression). Root test:coverage / workers / MCP / OpenAPI are unrelated to this UI race fix.

Safety

• No secrets, wallet details, hotkeys, coldkeys, user PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text stays sanitized, low-noise, and does not imply compensation guarantees or optimization tactics.
• Auth, cookie, CORS, GitHub App, Cloudflare, or session changes include negative-path tests.
• API/OpenAPI/MCP behavior is updated and tested where needed.
• UI changes use live API data or real empty/error/loading states, not production mock/demo fallbacks.
• Visible UI changes include a UI Evidence section below with JPG/JPEG or PNG screenshots arranged as organized, captioned, clickable thumbnails. SVG screenshots are not used as review evidence. Review-only screenshots or recordings are not committed to the repository.
• Public docs/changelogs are updated where needed; changelogs are only edited for release-prep PRs.

UI Evidence

AMS miner cohort card repo picker (/app/maintainer), dark theme only (loopover-ui has no light theme). Annotated mint outline marks the free-text owner/repo input whose keystrokes previously raced. Before and after are pixel-identical — the fix only drops superseded fetch responses; nothing rendered changes at rest.

Viewport × Theme	Before	After
Desktop · Dark
Tablet · Dark
Mobile · Dark

Notes

• Resubmit of fix(ui): drop stale repo-picker panel responses on keystroke races (#7784) #7888, which was auto-closed solely for an incomplete viewport×theme screenshot matrix (CI + LoopOver review had already recommended merge).
• No follow-up pushes on this tip (LoopOver one-shot rule).

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[loopover-orb]

Tip

✅ LoopOver review result - approve/merge recommended

_{Review updated: 2026-07-21 16:59:31 UTC}

5 files · 1 AI reviewer · no blockers · readiness 100/100 · CI green · clean

✅ Suggested Action - Approve/Merge

• safe to merge

Review summary
The AI review returned non-blocking notes for this change but did not include a separate narrative summary. Review the nits below before deciding this PR.

Nits — 4 non-blocking

• The `cancelled?: () => boolean` opt-in param plus `isCancelled = opts?.cancelled ?? (() => false)` boilerplate is duplicated near-identically across all four files; consider extracting a small `useCancellableEffect`/hook (as hinted by the existing `use-polled-fetch` convention) to avoid four independent copies of the same pattern.
• maintainer-settings.tsx is already flagged as long (~560 lines) by the external size check; this diff adds another ~20 lines to it, worth keeping in mind for a future split rather than blocking this fix.
• Possible screenshot-table issue: identical images (row 1) — Advisory only — verify the screenshot-table images against the stated change before deciding.
• Possible screenshot-table issue: identical images (row 2) — Advisory only — verify the screenshot-table images against the stated change before deciding.

Decision drivers

• ✅ Code review — No blockers (1 reviewer)
• ✅ Gate result — Passing (No configured blocker found.)

Context & advisory signals — never blocks the verdict

Signal	Result	Evidence
Linked issue	✅ Linked	#7784
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low review scope from cached public metadata (1 linked issue).
Validation posture	✅ 25/25	PR body includes validation/test evidence.
Contributor workload	✅ 10/10	Author activity: 47 registered-repo PR(s), 27 merged, 0 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	kai392; Gittensor profile; 47 PR(s), 0 issue(s).
Improvement	✅ Minor	risk: clean · value: minor · LLM: moderate

Review context

• Author: kai392
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: JavaScript, Kotlin, Perl, TypeScript, Vue
• Official Gittensor activity: 47 PR(s), 0 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Keep the PR focused and include validation evidence before maintainer review.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

🧪 Chat with LoopOver

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Visual preview

Route	Viewport	Before (production)	After (this PR's preview)	Diff
/	desktop	before /	after /	—
/	mobile	before / (mobile)	after / (mobile)	—

Click any thumbnail to open the full-size screenshot. Before = production · After = this PR's preview deploy.

Scroll preview

Route	Before (production)	After (this PR's preview)
/	before / (scroll)	after / (scroll)

A short scroll-through clip (desktop) — click either thumbnail to open the full animation. Evidence for scroll-linked behavior a single screenshot can't show.

_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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• Re-run LoopOver review

[loopover-orb]

LoopOver approves — the gate is satisfied and CI is green.