Fix wrong auth token key and mislabeled loading dialog on payment flows

registration/success read the token from the wrong localStorage key
(token instead of hope_events_token), which broke registration/form
loading there and made the new "Pay with Yoco" checkout call fail with
"Not authorized, token failed" — switched to the shared auth context
like the rest of the app.

dashboard/user's "Make payment" reused the ticket-email dialog, which
hardcoded "Sending tickets…" while loading — the dialog now takes an
optional loading title/subtitle so payNow can show its own message.

CHANGELOG.md

@@ -19,6 +19,11 @@ and this project follows [Semantic Versioning](https://semver.org/).
 
 - `/dashboard/user/pay` — the self-service partial-payment page — has been removed; it's no longer linked to from anywhere in the app.
 
+### Fixed
+
+- `/registration/success` read the auth token from the wrong `localStorage` key (`token` instead of `hope_events_token`), which silently broke loading the registration/attendee-form data on that page and made the "Pay with Yoco" button fail with "Not authorized, token failed". Now uses the shared auth context, like the rest of the app.
+- User dashboard: clicking "Make payment" briefly showed a "Sending tickets…" loading dialog (borrowed from the ticket-email flow) instead of a payment-specific message.
+
 ## [1.1.0] - 2026-07-24
 
 ### Added