TekH f4b78bce36 Add EnvelopeViewer for PDF rendering with pdf.js ...

Introduced a new Blazor component `EnvelopeViewer.razor` to display PDF documents with a user-friendly interface. The component supports dynamic routing via `/envelope/{EnvelopeKey}` and integrates the `pdf.js` library for efficient PDF rendering in the browser.

Key features include:
- Zoom and navigation controls (Next/Previous page, Zoom In/Out).
- Loading spinner, error handling, and fallback UI for robustness.
- Responsive design with modern styling using CSS.
- JavaScript interop via `pdf-viewer.js` for managing PDF rendering, scaling, and navigation.

Added lifecycle methods (`OnInitializedAsync`, `OnAfterRenderAsync`) for dynamic loading and rendering. Ensured asynchronous operations for smooth user interactions. Included a `DisposeAsync` method for cleanup.

2026-06-05 10:32:54 +02:00

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