chore: remove leftovers of the deleted onboarding AI offer and badge

The end-to-end setup still seeded the shared-provider offer's account
and captured its session, although the journey that used it is gone.
Three comments still pointed at what was removed: the tour launcher
cited the deleted personal-record badge as its model, the personal
record worker said the badge still renders, and the morning briefing
push said a concerning reading goes out as an anomaly notification,
which nothing sends.

src/components/onboarding/tour-launcher.tsx

@@ -244,8 +244,7 @@ export function TourLauncher({ ready = true }: TourLauncherProps) {
   // v1.4.47 — clock reading for the 24 h auto-launch gate. The
   // useState lazy-initialiser runs once at mount; subsequent re-renders
   // reuse the same value. This keeps the render path pure (React's
-  // purity linter rejects a bare `Date.now()` reference in render) and
-  // matches the established pattern in `personal-record-badge.tsx`:
+  // purity linter rejects a bare `Date.now()` reference in render):
   // capture the clock at a stable boundary, then derive freshness from
   // it. The launcher only consults this value once per (user, flag)
   // tuple via the `decidedFor` guard, so a mount that takes ten