Improve dashboard with better UI and dedicated pages for item lists

[codegen-sh[bot]]

This PR improves the dashboard with:

1. Better UI:

   • Enhanced dashboard overview with statistics and quick access cards
   • Improved visual hierarchy and information display
   • Better navigation between pages

2. Dedicated Pages:

   • Created separate pages for private items (/dashboard/private)
   • Created separate pages for public items (/dashboard/public)
   • Each page has its own breadcrumb navigation and context

3. Improved Table Structure:

   • Added a new DataTable component with advanced features:
     • Sorting functionality
     • Search filtering
     • Pagination
     • Better mobile responsiveness
   • Enhanced column definitions with better formatting

4. Technical Improvements:

   • Added @tanstack/react-table for advanced table functionality
   • Created reusable components for better code organization
   • Improved loading states and skeletons

These changes make the dashboard more user-friendly and provide a better experience for managing both private and public items.

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