TekH ce43ace3c2 Refactor signature handling and add PDF signature support ...

Refactored `OnSignatureButtonClick` in `EnvelopeViewer.razor`:
- Converted to async and added null-check for `_capturedSignature`.
- Integrated `pdfViewer.applySignature` to apply signatures to PDFs.

Added `applySignature` method to `pdf-viewer.js`:
- Handles rendering of signatures with image, metadata, and styling.
- Follows German standards for signature formatting.
- Includes error handling for missing elements.

Introduced `escapeHtml` helper in `pdf-viewer.js` to prevent XSS.
Updated `MaxThumbnailWidth` in `EnvelopeViewer.razor` to 400.
Enhanced logging for better debugging during signature application.

2026-06-07 13:47:34 +02:00

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