feat(race-hub): trustworthy defaults and fan-facing analysis hierarchy (#75)

Make bare /race-hub resolve to a completed session and never open empty
post-session analysis for a future race.

- Backend: add `default_analysis_session` to the Weekend context. It never
  resolves to a future session (picks the richest completed session, ties
  toward the later one; 0 when everything is upcoming). Existing
  `default_session_key` and deep links are unchanged.
- Frontend default resolution prefers the most recently completed weekend
  (`pickAnalysisFocusMeeting`) and consumes `default_analysis_session`, falling
  back to the switcher when only upcoming sessions exist.
- New `sessionState` lib maps timing + coverage to user language
  (upcoming/live/preparing/partial/ready/cancelled); the session rail, active
  sub-bar, and WeekendSwitcher now label states instead of raw x/11 counts.
- Future sessions render a purpose-built PreSessionView (expected availability +
  countdown) instead of empty Winner/Podium/Pole/Strategy/Compare cards.
- Analysis navigation regrouped into Story / Analysis / Data & Context; every
  existing tab is preserved. Diagnostics (renamed from Data Status) is now a
  secondary action and the raw dataset strip is hidden behind an explicit
  toggle, so operational coverage no longer precedes fan content.
- Loading/error states offer Retry and a path back to Weekend.

Tests: Go query tests for future-exclusion; Vitest for default selection,
future pre-session, partial state, error/retry, grouped nav, and sessionState;
hermetic Playwright for bare/completed/future/return-to-Weekend; new
race-hub-future visual snapshots. Seed adds a far-future session inside the
Monaco meeting (kept in-meeting so Command Center focus is unaffected).

Note: `default_analysis_session` is an additive field on the existing
`/weekend` contract (no new endpoint), per the spec's "context contract" scope.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/race-hub.spec.ts

@@ -2,6 +2,7 @@ import { test, expect } from '@playwright/test'
 
 const FULL_SESSION = 9472
 const CORE_ONLY_SESSION = 9000
+const FUTURE_SESSION = 9600
 
 test.describe('Race Hub Weekend Workspace', () => {
   test('lands on the Overview tab with workspace identity', async ({ page }) => {
@@ -91,20 +92,56 @@ test.describe('Race Hub Weekend Workspace', () => {
     await expect(page.getByTestId(`rh-switcher-session-${FULL_SESSION}`)).toBeVisible()
   })
 
-  test('Data Status tab points at admin instead of inline CLI hints', async ({ page }) => {
+  test('Diagnostics is a secondary action and points at admin, not inline CLI hints', async ({ page }) => {
     await page.goto(`/race-hub?session_key=${CORE_ONLY_SESSION}`)
-    await page.getByRole('tab', { name: 'Data Status' }).click()
+    await page.getByRole('tab', { name: 'Diagnostics' }).click()
 
     await expect(page.getByTestId('rh-data-status')).toBeVisible()
     await expect(page.getByRole('link', { name: /manage ingestion/i })).toHaveAttribute(
       'href',
       '/admin',
     )
+    // Raw coverage strip stays hidden until explicitly requested.
+    await expect(page.getByTestId('rh-dataset-strip')).toHaveCount(0)
+    await page.getByTestId('rh-diagnostics-toggle').click()
+    await expect(page.getByTestId('rh-dataset-strip')).toBeVisible()
   })
 
-  test('bare /race-hub redirects to the focus session', async ({ page }) => {
+  test('groups analysis navigation into Story, Analysis, and Data & Context', async ({ page }) => {
+    await page.goto(`/race-hub?session_key=${FULL_SESSION}`)
+    await expect(page.getByTestId('rh-tabgroup-story')).toBeVisible()
+    await expect(page.getByTestId('rh-tabgroup-analysis')).toBeVisible()
+    await expect(page.getByTestId('rh-tabgroup-context')).toBeVisible()
+  })
+
+  test('bare /race-hub resolves to a completed session, never a future one', async ({ page }) => {
     await page.goto('/race-hub')
     await expect(page).toHaveURL(/session_key=\d+/)
     await expect(page.getByTestId('race-hub')).toBeVisible()
+    // It must not land on the future session.
+    await expect(page).not.toHaveURL(new RegExp(`session_key=${FUTURE_SESSION}`))
+  })
+
+  test('explicit completed session deep link stays stable and shows analysis', async ({ page }) => {
+    await page.goto(`/race-hub?session_key=${FULL_SESSION}`)
+    await expect(page).toHaveURL(new RegExp(`session_key=${FULL_SESSION}`))
+    await expect(page.getByTestId('rh-overview')).toBeVisible()
+  })
+
+  test('explicit future session renders the pre-session view, not empty analysis', async ({ page }) => {
+    await page.goto(`/race-hub?session_key=${FUTURE_SESSION}`)
+    await expect(page.getByTestId('race-hub')).toBeVisible()
+    await expect(page.getByTestId('rh-presession')).toBeVisible()
+    await expect(page.getByTestId('rh-overview')).toHaveCount(0)
+  })
+
+  test('returning to Weekend from an analysis view preserves the meeting context', async ({ page }) => {
+    await page.goto(`/race-hub?session_key=${FULL_SESSION}`)
+    await page.getByRole('tab', { name: 'Strategy' }).click()
+
+    await page.getByTestId('rh-switch-weekend').click()
+    await expect(page.getByTestId('rh-switcher')).toBeVisible()
+    // The current session remains reachable/selected from the switcher.
+    await expect(page.getByTestId(`rh-switcher-session-${FULL_SESSION}`)).toBeVisible()
   })
 })