## Summary
- When a user cancels the bank authorization flow (e.g. clicks cancel on
the bank's page), the pending `BankingConnection` is now soft-deleted so
it doesn't remain stuck in `pending` status
- Flash messages (`success`/`error`) are now shared with the frontend
via Inertia shared data
- The connections settings page shows a toast notification with the
error message on redirect
## Test plan
- [ ] Start a bank connection flow, cancel on the bank's authorization
page, and verify:
- A toast error appears on the connections page
- The pending connection is removed from the list
- [x] Complete a successful bank connection and verify the success toast
appears
- [x] Run `php artisan test
tests/Feature/OpenBanking/AuthorizationControllerTest.php`