Phase 18: Fan Command Center and Admin Split

Goal

Shift the Web UI from a local-data console toward an F1 fan race-weekend command center, while keeping the dark, dense, ops-room aesthetic. Move local-data and ingestion concerns into a thin Admin / Data Health area so they no longer dominate the fan-facing first screen.

Completed Scope

Reworked / (CommandCenterPage) around the focus race weekend:
- GP identity band with country decal, GP name, location, circuit, date range, status eyebrow (Live now / Current / Next / Recent), and a country-derived left-edge accent strip.
- Countdown block — LIVE state, current-session label, next-session Xd HHh MMm SSs countdown, or "Weekend finished" — anchored to the band.
- Primary actions row: Watch Live, Open Analysis (preselects race → qual → first local session), Schedule jump.
- Session schedule as responsive cards instead of a table, with per-session coverage dot, status pill, and direct Race Hub link (keeps the existing cc-session-{key} testid).
- Recent local weekends rendered as a chip strip with country decals.
- Empty state reframed: short eyebrow, single-paragraph instruction, and links to Live + Admin (no inline CLI on the fan-facing surface).
Added frontend/src/lib/gpIdentity.ts for country accent, 3-letter decal, and short date-range formatting.
Reframed DataLibraryPage as Admin · Data Health: page header, utility-style stats banner (seasons / full / partial / missing), and a back-link to Command Center in the footer.
Added /admin route rendering the same Data Health page. /data-library remains as a legacy alias so existing links keep working.
Updated Nav so primary fan destinations (Command / Live / Race Hub) sit next to the logo, and a small monospace Admin chip is anchored to the far right as a utility link.

What Moved Into Admin / Data Health

Five-stat coverage strip (Seasons / Full / Partial / Missing / Sessions Local) — now lives in the admin banner.
CLI ingest guidance — only shown under Admin and inside meeting detail.
Per-meeting weekend table, per-session dataset status panel, and ingest command blocks — unchanged content, but no longer reachable from the fan nav directly.

What Did Not Change

Race Hub session-key table flow is unchanged (deeper rework is deferred).
No new backend endpoints. Command Center still calls the existing local-first APIs (/api/v1/seasons, /api/v1/meetings, /api/v1/weekend, /api/v1/live/state).
Live SignalR bridge, Live Timing page, and TUI live mode are untouched.

Tests and Visual Coverage

Updated:

frontend/src/test/CommandCenterPage.test.tsx — covers new band, decal, empty-state copy, and analysis action label.
tests/command-center.spec.ts — exercises new actions container and the reframed admin route alongside existing routes.
tests/data-library.spec.ts — renamed describe block, exercises both /admin and the /data-library alias, uses the new Admin nav link.
tests/production-smoke.spec.ts — covers /admin, the legacy /data-library route, and the updated nav labels.
tests/visual/__snapshots__/{desktop,tablet,mobile}/{command-center,data-library}.png regenerated against the new layout.

Verification

npm --prefix frontend test -- --run
npm --prefix frontend run build
npm run test:e2e
npm run test:e2e:prod
npm run test:visual
npm run test:visual:prod

All commands above were run in this branch and pass: 94 unit tests, 15 E2E, 6 prod smoke, 12 visual baseline, 12 prod visual baseline.

Limitations and Follow-ups

The Schedule action only renders when a next session exists. During a live session the row shows two actions instead of three; intentional.
Country accent palette in gpIdentity.ts is a hand-tuned subset of country codes; unknown codes fall back to a neutral gray.
Race Hub remains the next target — its session-selection flow is still the most dated part of the fan path, especially on tablet.

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