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/lib/books.js

@@ -26,4 +26,17 @@ function bookInfo(book) {
   return BOOKS[key] || { name: key, mono: key.slice(0, 3) || '?', bg: '#14141E', fg: '#B8BCC8', bd: '#23232F' };
 }
 
-module.exports = { BOOKS, bookInfo };
+/** Canonical comparison key for a book (Session 49) — resolves "DK"/"draftkings"
+ *  /"DraftKings" to the same value so preferred-book matching is robust. */
+function bookKey(book) {
+  return String(bookInfo(book).name || book || '').toLowerCase().replace(/[^a-z0-9]/g, '');
+}
+
+/** Is `book` in the user's preferred list? (accepts ids, codes, or names) */
+function isPreferredBook(book, preferred) {
+  if (!Array.isArray(preferred) || preferred.length === 0) return false;
+  const k = bookKey(book);
+  return preferred.some((p) => bookKey(p) === k);
+}
+
+module.exports = { BOOKS, bookInfo, bookKey, isPreferredBook };