Introduced a `SenderPdfImageEditorToolbar` component to enhance the PDF editor with navigation, zoom, and action controls. Updated `SenderPdfImageEditor.razor` to display the toolbar when `PageCount > 0`.
Added parameters (`CurrentPage`, `TotalPages`, `ZoomPercent`) and computed properties to manage and display toolbar state dynamically.
Styled the toolbar in `envelope-viewer.css` with grid-based layout, responsive design, and hover/disabled states for buttons. Adjusted styles for smaller screens to improve usability.
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