📝 Description

This PR introduces a peer-based Developer Skill Endorsement system that allows users to showcase their skills on their profiles and receive endorsements from other community members, building trust and credibility within the DevConnect platform.

🎯 Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📚 Documentation update
• 🎨 UI/UX improvement
• ⚡ Performance improvement
• ♿ Accessibility improvement
• 🔧 Refactoring

🔗 Related Issues

Issue #155

📋 Changes Made

• Created Skills and SkillEndorsements database tables with RLS policies
• Implemented SkillsSection component for profile skill management
• Added custom hooks (useSkills) for skill CRUD and endorsement operations
• Integrated skill endorsements into ProfilePage
• Added TypeScript interfaces for type safety
• Included comprehensive documentation in SKILL_ENDORSEMENT.md
• Updated README with skill endorsement feature details

🧪 Testing

• Unit tests added/updated
• Tested on desktop
• Tested on mobile
• Manual testing completed

Testing Steps:

1. Navigate to /profile page
2. Click "Add Skill" button and add a skill (e.g., "React", "TypeScript")
3. Verify skill appears in the skills section
4. Visit another user's profile (if available)
5. Click the thumbs-up icon to endorse their skills
6. Verify endorsement count increases
7. Click again to remove endorsement
8. Try to endorse your own skills (should be disabled)
9. Test in both light and dark mode

📦 Dependencies

• No new dependencies
• New dependencies added (list below)

✅ Checklist

Code Quality

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I ran npm run lint and fixed all issues

Testing & Functionality

• I have tested my changes thoroughly
• New and existing tests pass locally with my changes
• I have added tests that prove my fix is effective or my feature works

Documentation

• I have updated the documentation accordingly
• I have updated the README if needed
• I have added/updated inline comments where necessary

Git & Commits

• My commits have clear, descriptive messages
• My branch is up to date with the base branch
• I have not included unnecessary commits

Breaking Changes

• This PR does not introduce breaking changes
• I have documented any breaking changes clearly

📝 Additional Context

Database Setup Required:
Before merging, the database schema must be executed in Supabase:

-- Run the contents of database-schema-skills.sql in Supabase SQL Editor

Key Features:

• Users can add/remove skills on their profile
• Other users can endorse skills (one endorsement per skill per user)
• Real-time endorsement counts displayed
• Self-endorsement prevention via RLS policies
• Dark mode support with responsive design

Security:

• Row Level Security (RLS) policies prevent self-endorsements
• Unique constraints prevent duplicate skills and endorsements
• Cascade deletes maintain referential integrity

🔍 Reviewer Notes

Please pay special attention to:

• Database schema and RLS policies - Ensure security policies are correctly implemented
• TypeScript types - Verify all interfaces are properly defined
• Component architecture - Check if hooks are used efficiently
• UI/UX - Test the component in both light and dark modes
• Error handling - Verify appropriate error messages are shown

🚀 Deployment Notes

Pre-deployment steps:

1. Execute database-schema-skills.sql in Supabase SQL Editor
2. Verify Skills and SkillEndorsements tables are created
3. Confirm RLS policies are enabled on both tables
4. Test with multiple user accounts to verify endorsement flow

No breaking changes - This feature is additive and doesn't affect existing functionality.