[TSVRN9]

Closes #65

Summary

• Ports web's app.css design tokens (maroon/gold/paper/cream/ink palette, display/body/mono
  type roles, radii) to React Native as mobile/src/lib/theme.ts — plain StyleSheet values
  and two pure helper functions (withOpacity, buttonColors), no component library, no new
  runtime dependency.
• Adds the five shared components the issue calls for, mirroring web's component layer:
  Card, Button (primary/secondary/ghost variants, sm size), Badge, Stat, EmptyState
  (mobile/src/components/ui/). Theme + components were written red-first — see the red/green
  log below.
• Restyles every screen: index (rebuilt as a Today-first home per web IA: Today-first home #64's IA — macro stats
  from device-local storage at top, deep-linking to /today; dining halls below with the
  same favorite-star behavior; then quick links to every other screen, so nothing that was
  reachable from the old nav grid became unreachable), halls/[slug], today, filters,
  favorites, rank, friends, notifications, events, press, newsletter, plus the
  root Stack header (_layout.tsx).
• Behavior is unchanged: same storage calls, same Supabase queries/RLS-gated writes, same
  favorite/log/rank logic in every screen. The only functional-adjacent changes are layout
  fixes needed to host the new components without breaking scroll (wrapping screens in
  ScrollView/FlatList headers/footers where they weren't before; the home screen's halls
  list moved from a nested FlatList to a plain .map() since it now lives inside a
  ScrollView, avoiding the nested-VirtualizedList warning).
• react-test-renderer + @types/react-test-renderer added as devDependencies so component
  tests can render RN trees under jest-expo/tsc. Both were already transitive
  dependencies of jest-expo at the exact version now declared (pnpm-lock.yaml already had
  them pinned) — this promotes an already-resolved package to a direct devDependency rather
  than adding anything new to the dependency graph. pnpm install after the change reported
  "Already up to date" and only moved the existing lockfile entries into mobile's importer
  list (6-line lockfile diff).

Red/green (theme + shared components)

Red — before theme.ts/components/ui/* existed:

FAIL src/lib/theme.test.ts
  Cannot find module './theme' from 'src/lib/theme.test.ts'
FAIL src/components/ui/Button.test.tsx
  Cannot find module './Button' from 'src/components/ui/Button.test.tsx'
FAIL src/components/ui/Badge.test.tsx
  Cannot find module './Badge' from 'src/components/ui/Badge.test.tsx'
FAIL src/components/ui/Stat.test.tsx
  Cannot find module './Stat' from 'src/components/ui/Stat.test.tsx'
FAIL src/components/ui/EmptyState.test.tsx
  Cannot find module './EmptyState' from 'src/components/ui/EmptyState.test.tsx'
FAIL src/components/ui/Card.test.tsx
  Cannot find module './Card' from 'src/components/ui/Card.test.tsx'

Test Suites: 6 failed, 6 total

Green — after implementing them:

PASS src/lib/theme.test.ts
PASS src/components/ui/Card.test.tsx
PASS src/components/ui/EmptyState.test.tsx
PASS src/components/ui/Badge.test.tsx
PASS src/components/ui/Stat.test.tsx
PASS src/components/ui/Button.test.tsx

Test Suites: 6 passed, 6 total
Tests:       17 passed, 17 total

Full suite (including pre-existing pairSelection/webCryptoPolyfill specs): Test Suites: 8 passed, 8 total, Tests: 28 passed, 28 total. npx tsc --noEmit is clean.

Verification gap — please read before merging

I could not get real Android-emulator screenshots of these screens, despite trying every
approach the issue described, and I don't want to claim otherwise. Details, and what I'd need
to close this gap, are in my comment on #65. Short version: the installed build on
emulator-5554 has no expo-dev-client (confirmed via package.json and logcat — no
DevLauncher traces anywhere), so it can't be redirected to a second Metro via deep link;
its bundle host is compiled in at native-build time (bridgeless new-arch ReactHost logs show
it loading straight from Metro on port 8081, reached through the emulator's own 10.0.2.2 NAT,
not through adb reverse, so remapping that port doesn't redirect it either); and both the
git-checkout fallback and a plain non-git file copy into the main checkout were blocked by this
environment's own guardrails. I did not rebuild native or seize the shared port 8081 (a
long-running expo run:android process another session/human depends on) to force it. Everything
else asked for — tokens, components, red/green evidence, every screen restyled, tsc/jest
clean — is done and independently verifiable from this diff and the log above.

Test plan

• npx tsc --noEmit clean in mobile/
• npx jest clean in mobile/ (28/28)
• Real-device/emulator screenshots of each restyled screen — not completed, see above