DS1 follow-up: close the sb-token trust-bug class across all surfaces

The OAuth-only 'sb-token' localStorage key was read by profile, slip,
dashboard (recent-scans), settings, and tracker for their authenticated
fetches. Email/password users never had that key, so those fetches sent
no Authorization header and silently returned nothing.

- web/src/lib/authToken.js — currentAccessToken() reads the REAL Supabase
  session (sb-<ref>-auth-token, v2 top-level or v1 currentSession), legacy
  fallback. CommonJS so Jest can unit-test it (5 tests).
- Swept all 5 pages to the helper (scan already session-first from DS1).
- lib/api.ts (0 callers) + ParlayTray (unmounted) left as dead code.

236 suites / 2842 tests green, next build exit 0.

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

web/src/lib/authToken.js

@@ -0,0 +1,41 @@
+/**
+ * currentAccessToken (DS1 follow-up) — the bearer token for authenticated
+ * browser fetches, robust across EVERY sign-in method.
+ *
+ * The bug this closes: surfaces read `localStorage.getItem('sb-token')`, but
+ * that key is written ONLY by the OAuth callback. Email/password users (the
+ * majority) had no `sb-token`, so their authenticated fetches (profile stats,
+ * tracker, slip, settings) sent no Authorization header and silently returned
+ * nothing. DS1 fixed the scan→ledger path; this helper fixes the rest.
+ *
+ * Supabase-js persists the session as JSON under `sb-<project-ref>-auth-token`
+ * with `access_token` at the top level (v2) or under `currentSession` (v1).
+ * We read that directly (best-effort, synchronous), falling back to the legacy
+ * key. Prefer `useAuth().session?.access_token` in components that already have
+ * it; this helper is for the ones that don't.
+ *
+ * CommonJS (like colorContract.js / clvDisplay.js) so the plain-JS Jest suite
+ * can require it AND the .tsx app can import it (Next allowJs).
+ *
+ * @returns {string|null}
+ */
+function currentAccessToken() {
+  if (typeof window === 'undefined') return null;
+  try {
+    for (let i = 0; i < window.localStorage.length; i += 1) {
+      const k = window.localStorage.key(i) || '';
+      if (/^sb-.*-auth-token$/.test(k)) {
+        const raw = window.localStorage.getItem(k);
+        if (!raw) continue;
+        const v = JSON.parse(raw);
+        const tok = (v && v.access_token) || (v && v.currentSession && v.currentSession.access_token);
+        if (tok) return tok;
+      }
+    }
+  } catch {
+    /* fall through to the legacy key */
+  }
+  return window.localStorage.getItem('sb-token');
+}
+
+module.exports = { currentAccessToken };