Introduce a new feature allowing users to open URLs for receiver envelopes directly from the sender page. This includes:
- Injecting `EnvelopeReceiverService` in `SenderPage.razor`.
- Adding a UI button to open receiver envelope URLs.
- Implementing `OpenReceiverEnvelopeUrlAsync` for URL handling.
- Extending `EnvelopeReceiverService` with methods for URL retrieval and feature check.
- Updating `EnvelopeReceiverController` with new endpoints for URL access.
- Introducing `SenderFeatureAccessOptions` for managing feature access.
- Configuring feature access in `Program.cs` and `appsettings.json`.
- Restricting feature usage to specified email addresses.
TekH
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