chore: bump to 0.5.2 (PayPal return URLs) (#20)

* fix(ci): use @Jesssullivan scope for GitHub Packages mirror

* feat(venmo): add returnUrl/cancelUrl to experience_context

PayPal requires return_url and cancel_url in the Venmo payment source
experience_context for proper popup handling. Without them, PayPal may
force additional buyer verification loops or block the popup flow.

New optional fields on VenmoAdapterConfig: returnUrl, cancelUrl.

* chore: bump to 0.5.2 (PayPal return URLs)

Author: Jesssullivan

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tummycrypt/scheduling-kit",
-  "version": "0.5.1",
+  "version": "0.5.2",
   "description": "Backend-agnostic scheduling components with alternative payment support",
   "type": "module",
   "exports": {