Doccy medical certificate – toasts

Trigger every Sonner toast from the med cert checkout flow. Form toasts use the medcertSuccess toaster (top-right, frosted); checkout and payment toasts use the default app toaster.

1. Form validation (medcertSuccess)

2. Checkout preparation (medcertSuccess)

3. Sign-in nudge (default toaster)

4. Active subscription checkout (default toaster)

5. Payment success (default toaster)