optimize feed filtering and pagination flow

[ash1shkumar]

📝 Description

This PR improves the feed retrieval workflow by introducing reusable filtering and pagination helpers while separating feed processing logic from UI rendering.

Previously, feed filtering and pagination operations were handled directly within component rendering logic. As feed volume grows and additional activity types are introduced, maintaining efficient feed processing can become increasingly challenging.

Changes Implemented

• Added reusable feed filtering helper
• Added reusable pagination helper
• Separated feed processing from rendering logic
• Centralized filtering behavior
• Centralized pagination execution
• Reduced duplicated feed traversal logic
• Improved code organization and maintainability

Benefits

• Improved feed processing scalability
• Cleaner separation of concerns
• Reduced rendering complexity
• Easier future pagination enhancements
• More maintainable feed architecture
• Better support for larger activity datasets

🎯 Type of Change

• Refactoring
• Performance Improvement
• Maintainability Enhancement

✅ Testing

• Verified feed filtering behavior remains unchanged
• Verified search functionality works correctly
• Verified filter switching works correctly
• Verified pagination continues to load additional feed items
• Verified visible item count updates correctly
• Verified feed rendering remains unchanged
• Verified backend feed loading remains functional
• Verified fallback feed behavior remains intact
• Verified no UI regressions after refactoring

Fixes #207

Expected Labels

level3 NSoC'26

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