Refactor `EnvelopeSenderEditorPage.razor` to enhance the structure and behavior of the PDF editor wrapper:
- Add `class="pdf-editor-wrapper"` and update `overflow` to `auto`.
- Update `DxPdfViewer`'s `CssClass` to `sender-editor-pdf-viewer`.
- Introduce `OnAfterRenderAsync` to synchronize the overlay with the viewer.
Add new styles in `envelope-viewer.css` for better layout:
- Ensure `.pdf-editor-wrapper` and `.sender-editor-pdf-viewer` occupy full dimensions.
- Center and align content within the PDF viewer.
Enhance `envelope-editor.js` with `syncOverlayToPage`:
- Dynamically adjust overlay position and size relative to the viewer.
- Use `MutationObserver` and event listeners for real-time synchronization.
- Handle delayed rendering with scheduled sync attempts.
These changes improve overlay alignment, user experience, and code maintainability.
TekH
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