This commit introduces a signature navigation feature in the PDF viewer:
- Removed zoom preset buttons to make space for the new toolbar.
- Added "Previous" and "Next" buttons for navigating signatures.
- Displayed a signature counter with signed/total signatures and a badge for unsigned signatures or completion status.
- Introduced state variables (`_totalSignatures`, `_signedSignatures`, `_unsignedSignatures`) to track signature progress.
- Implemented methods for navigating signatures (`GoToPreviousSignature`, `GoToNextSignature`, `UpdateSignatureCounterAsync`).
- Enhanced JavaScript with `getSignatureNavState`, `goToNextSignature`, and `goToPreviousSignature` for navigation logic.
- Updated CSS for the toolbar and signature navigation, including responsive adjustments and hover effects.
- Improved error handling during signature counter updates.
- Updated `RenderSignatureButtonsAsync` to refresh the signature counter after rendering.
These changes improve the user experience by enabling efficient navigation and tracking of signatures in the PDF viewer.
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