refactor: optimize workspace state derivation

[ash1shkumar]

📝 Description

This PR improves workspace rendering efficiency by introducing memoized workspace state preparation and consolidating derived UI data into a reusable computation layer.

Previously, workspace-related values such as developer metrics and activity summaries were derived directly during component rendering. While functional, repeated derivation during render cycles can become increasingly difficult to maintain as additional workspace capabilities and collaborative features are introduced.

Changes Implemented

• Introduced reusable workspace data preparation helper
• Centralized derived workspace state generation
• Added memoized workspace data computation using useMemo
• Reduced render-time state derivation
• Consolidated activity and contributor metrics
• Improved separation between data preparation and UI rendering
• Enhanced maintainability of workspace state workflows

Benefits

• Reduced unnecessary state recomputation
• Improved rendering efficiency
• Better scalability for future workspace features
• Cleaner component structure
• Improved maintainability
• More predictable UI rendering behavior

🎯 Type of Change

• Refactoring
• Performance Improvement
• Code Quality Improvement

✅ Testing

• Verified workspace page renders correctly
• Verified active developer list remains unchanged
• Verified activity feed renders correctly
• Verified contributor count displays accurately
• Verified activity count displays accurately
• Verified Kanban board functionality remains unaffected
• Verified no UI regressions across workspace sections
• Verified memoized state generation produces expected results

Fixes #212

Expected Labels

level3 NSoC'26

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