consolidate analytics computation logic

[ash1shkumar]

📝 Description

This PR improves the analytics architecture by introducing reusable computation helpers and centralizing aggregate metric calculations used by the performance analytics dashboard.

Previously, analytics values such as completed tasks, assigned tasks, review totals, and completion percentages were calculated directly within the component. As analytics requirements expand, maintaining multiple isolated calculation paths can increase duplication and make future enhancements more difficult.

Changes Implemented

• Introduced reusable analytics aggregation helper
• Added centralized completion rate calculation helper
• Consolidated metric computation logic into dedicated utility functions
• Reduced duplicated calculation patterns within the component
• Added memoized analytics aggregation using useMemo
• Improved separation between analytics computation and presentation layers

Benefits

• Improved analytics consistency
• Reduced duplicated calculations
• Better maintainability
• Cleaner component structure
• Improved scalability for future reporting features
• Easier extension of analytics metrics and aggregations

🎯 Type of Change

• Refactoring
• Performance Improvement
• Code Quality Improvement

✅ Testing

• Verified completion percentage calculations remain accurate
• Verified completed task totals render correctly
• Verified assigned task totals remain unchanged
• Verified review totals render correctly
• Verified metric toggle functionality remains operational
• Verified analytics charts render correctly
• Verified member performance visualization remains unchanged
• Verified no UI regressions after computation refactoring
• Verified memoized aggregation updates correctly when member data changes

Fixes #209

Expected Labels

level3 NSoC'26

[vercel]

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[github-actions]

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