- Updated `BurnPdfCommand` to accept `EnvelopeId` or `EnvelopeUuid` instead of full `EnvelopeQueryBase` and document data.
- Reworked `BurnPdfCommandHandler` to fetch envelope and document from repositories, including proper validations and exceptions.
- Removed direct dependency on `Signature` repository; annotations now retrieved via document elements.
- Added detailed exception handling for missing envelope, document, or byte data.
- Minor namespace and using cleanup.
TekH
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