4be9e38a9e53f122b8186be8b7d268ba32542e88
Updated the "Letzte Aktualisierung" date in SF-74-PLAN.md to reflect the latest progress. Added requirement 6d for a PDF Preview Popup using `DxPdfViewer` and marked it as completed. Provided additional context for Phase 6d, explaining the read-only behavior of envelopes after sending and the technical approach for implementing the PDF preview functionality.
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