Add React race hub frontend

documentations/refactor/14-phase-6-react-race-hub-analytics.md

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+# Phase 6 React Race Hub Analytics
+
+## Purpose
+
+Phase 6 expands the React Race Hub from a classification/grid slice into a more
+useful race analysis surface. Phase 5 proved the React stack, API contract,
+desktop layout, and phone table behavior. This phase should add the first
+bespoke F1 analysis views without replacing the whole Web app.
+
+This remains a frontend-led phase for Claude.
+
+## Scope
+
+Add Race Hub tabs or segmented views for:
+
+- Overview / Classification
+- Starting Grid
+- Strategy
+- Position Evolution
+- Dataset Status
+
+Strategy and position views should be built from local-first backend data only
+when the backend exposes the needed datasets. If laps/stints/positions are not
+yet available through `/api/v1/race-hub`, add clear missing states instead of
+fake charts.
+
+## Backend Contract
+
+Current Race Hub API:
+
+```text
+GET /api/v1/race-hub?session_key=...
+```
+
+Current datasets:
+
+- meeting
+- session
+- drivers
+- results
+- starting_grid
+
+If analytics require laps, stints, pit stops, or position samples, keep backend
+changes small and explicit. Do not reintroduce direct OpenF1 reads from the
+React app.
+
+## Design Direction
+
+Improve the information hierarchy without drifting into generic dashboard UI:
+
+- stronger timing-wall readability;
+- compact controls;
+- minimal panel framing;
+- no decorative gradients or card sludge;
+- team colors as data accents;
+- mobile views that fit the active columns rather than relying on horizontal
+  scrolling.
+
+## Non-Goals
+
+Do not include these in Phase 6:
+
+- live timing React rewrite;
+- full season calendar rebuild;
+- settings UI;
+- ingest UI;
+- static archive support;
+- replacing the old Go-served Web UI entirely.
+
+## Acceptance Criteria
+
+Phase 6 is complete when:
+
+- Race Hub has an ergonomic tab/segmented-view structure;
+- classification and grid remain intact;
+- analytics views show either real local data or honest missing states;
+- desktop and phone layouts have been visually checked;
+- frontend tests/build pass;
+- Go build still passes.