Introduced a new `SenderEditorPage` with a modern UI for managing envelopes, uploading PDFs, and placing signature fields. Integrated `DevExpress.Blazor.PdfViewer` for PDF rendering and interaction.
Key features include:
- PDF upload, rendering, and validation.
- Signature field placement with normalized coordinates.
- Receiver management with validation and email suggestions.
- Envelope metadata handling (title, message).
- Save as draft and send functionality with validation.
- Edit mode for existing envelopes.
- Improved UX with dynamic elements and color-coded receivers.
- Localization support for multi-language UI.
Updated `_Imports.razor` to include necessary namespaces for DevExpress components and the new `PdfEditor` namespace.
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