Add Pagination to Dashboard Scan History #118

Description

Summary

Add pagination to the Vizably dashboard so that users see a maximum of 20 saved scans per page.

Problem

As users accumulate more scans, displaying the entire scan history on a single dashboard page can become difficult to navigate and inefficient to load.

Proposed Work

• Display a maximum of 20 scans per dashboard page.
• Add controls for navigating between pages.
• Show the current page and available pages where appropriate.
• Ensure pagination works with the existing saved-scan data stored in the user's storage.
• Maintain existing scan selection and report-opening functionality.

Acceptance Criteria

• The dashboard displays no more than 20 scans at a time.
• Users can navigate between pages when more than 20 scans exist.
• Pagination correctly reflects the available scan history.
• Existing scans remain accessible through the dashboard.
• The implementation works with the existing GitHub storage architecture.