Session 49: Complete onboarding flow + name micro-fixes (2185 tests)

Name micro-fixes (close the normalization arc):
- collapseInitials merges "J C Escarra" -> "JC Escarra" (display + key); both
  playerName.js copies. Added mickey:michael nickname.

Onboarding flow (end-to-end, complete):
- Storage: Supabase user_metadata.preferences (no migration).
- API: src/routes/preferences.js GET/POST (requireAuth, admin getUserById/
  updateUserById, partial merge + sanitize) + Next /api/preferences proxy.
- Page: web onboarding/page.tsx — 3 steps (sports >=1 / books skip / bankroll
  presets+custom+skip) -> SIGNAL ACTIVE -> POST onboarding_complete:true -> 2s
  -> /dashboard. Redirects to login when unauthenticated.
- Redirect: dashboard fetches /api/preferences fresh; new+incomplete users
  (created_at >= cutoff) -> /onboarding; never while auth loading; existing
  users exempt.
- Personalization: Slate default tab = prefs.sports[0]; preferred books glow in
  the card lines grid (lib/books isPreferredBook, threaded dash->Slate->GameCard).
- Settings: PREFERENCES section loads + edits + saves sports/books/limit.

Backend 2156 -> 2185 tests (+29), 184 suites. Web build clean (exit 0).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/components/Slate.tsx

@@ -346,9 +346,11 @@ function groupByGame(rawProps: RawProp[], sport: SlateSport): SlateGame[] {
 export interface SlateProps {
   initialTab?: SlateTab;
   tier?: Tier;
+  /** Session 49 — user's preferred books (highlighted in each card's lines). */
+  preferredBooks?: string[];
 }
 
-export default function Slate({ initialTab = 'all', tier = 'free' }: SlateProps) {
+export default function Slate({ initialTab = 'all', tier = 'free', preferredBooks }: SlateProps) {
   const router = useRouter();
   const { session } = useAuth();
   const [tab, setTab] = useState<SlateTab>(initialTab);
@@ -751,6 +753,7 @@ export default function Slate({ initialTab = 'all', tier = 'free' }: SlateProps)
           <VyndrGameCard
             key={`${g.sport}-${g.homeTeam}-${g.awayTeam}-${i}`}
             game={slateGameToCardData(g, gradeIndex, deltaIndex, pitcherMap)}
+            preferredBooks={preferredBooks}
             onOpen={() => router.push('/scan')}
           />
         ))}