Introduced a new rejection flow in `ReceiverPage.razor` to detect
rejected envelopes and redirect users to a dedicated rejection
page (`ReceiverRejectedPage.razor`).
- Added `IsRejected` helper method to check envelope rejection
status based on current status and history.
- Created `ReceiverRejectedPage.razor` to display rejection
messages, sender details, and navigation options.
- Implemented localized strings for dynamic rejection messages.
- Designed a visually distinct layout for the rejection page.
- Improved user experience with clear messaging and proper
handling of invalid or unauthorized access.
TekH
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