Implement Scalable Challenge Grid UI

[spark33]

Summary

Transform the frontend interview platform from a static 2-task list into a scalable card grid that can handle 10-50+ challenges with comprehensive filtering and categorization capabilities.

Changes

New Features

• ✅ Card grid layout with responsive columns (1/2/3 based on screen size)
• ✅ Filtering by category, difficulty, and search text
• ✅ Dynamic routing via /challenges/[slug]
• ✅ Backward compatibility with old URLs (/task1, /task2)
• ✅ Reusable component architecture

Files Added

• src/data/challenges.ts - Central challenge registry with TypeScript types
• src/components/ChallengeBadge/ChallengeBadge.tsx - Badge component for difficulty/category/time
• src/components/ChallengeCard/ChallengeCard.tsx - Interactive card component
• src/components/ChallengeFilters/ChallengeFilters.tsx - Filter UI component
• src/app/challenges/[slug]/page.tsx - Dynamic route handler
• src/app/task2/Task2Content.tsx - Extracted task 2 content for reusability
• IMPLEMENTATION_NOTES.md - Complete implementation documentation

Files Modified

• src/app/page.tsx - Refactored to card grid with filters
• src/app/task1/page.tsx - Added redirect to new URL structure
• src/app/task2/page.tsx - Updated to use Task2Content component
• src/app/task1/debug/page.tsx - Updated navigation links

Architecture Benefits

• Scalable: Easy to add 10, 50, 100+ challenges
• Maintainable: Single source of truth in challenges.ts
• Type-safe: Full TypeScript support with interfaces
• Mobile-friendly: Responsive by default with Chakra UI
• Extensible: Easy to add progress tracking, sorting, favorites, etc.

Routes

• / - Homepage with challenge grid and filters
• /challenges/debug-dashboard - Task 1 (debugging challenge)
• /challenges/emptystate-component - Task 2 (component design)
• /task1 - Redirects to /challenges/debug-dashboard (backward compatibility)
• /task2 - Shows task 2 content (backward compatibility)
• /task1/debug - Direct access still works

Adding New Challenges

Adding new challenges is now simple (3 steps):

1. Add to registry in src/data/challenges.ts
2. Create task component
3. Register in dynamic route handler

See IMPLEMENTATION_NOTES.md for detailed instructions.

Testing

• ✅ Homepage loads with 2 challenge cards
• ✅ Filters work (category, difficulty, search)
• ✅ Cards are clickable and navigate correctly
• ✅ Backward compatibility maintained
• ✅ Responsive design works on mobile/tablet/desktop

🤖 Generated with Claude Code