Issue 8 individual art pages

[hanminh1203]

Change Summary

Improved responsive design and refactored artwork pages to follow Next.js best practices. Centralized mock data generation into a reusable hook and added proper error handling for empty database states.

Changes Made

• Refactored ButtonGallery component to use Next.js Link component properly
• Added placeholder SVG icon for artworks without images
• Centralized mock data generation in useArtworkData.ts hook
• Added error handling in getServerSideProps to return mock data when API fails or DB is empty
• Improved responsive layouts with proper spacing and mobile-first approach
• Fixed TypeScript type issues with Next.js route parameters and PageResult types

Change Form

• The pull request title has an issue number (Individual art pages #8)
• The change works by "Smoke testing" or quick testing
• The change has tests - NA: Mock data hook doesn't require unit tests at this stage
• The change has documentation - NA: Changes are self-explanatory code refactoring

Other Information

• Add module django_filters.rest_framework - need confirmation

Testing Notes:

• Tested with empty database - placeholder icons display correctly
• Tested navigation between gallery and individual artwork pages
• Verified responsive layout on mobile and desktop viewports

Related issue

• Resolve Individual art pages #8