optimize kanban task ordering reconciliation

[ash1shkumar]

📝 Description

This PR improves the Kanban board task movement workflow by refactoring ordering reconciliation and synchronization logic used during drag-and-drop operations.

Previously, task ordering recalculation and update validation logic were handled directly within the drag event workflow. As board activity grows and concurrent task updates become more frequent, maintaining consistent ordering behavior can become increasingly difficult.

Changes Implemented

• Introduced reusable task ordering reconciliation helpers
• Added centralized task update validation logic
• Extracted ordering recalculation from drag event handling
• Reduced duplicated reconciliation workflows
• Improved task movement synchronization safeguards
• Enhanced maintainability of drag-and-drop processing

Benefits

• More predictable task ordering behavior
• Reduced reconciliation duplication
• Improved board stability during task movement
• Better separation of concerns
• Improved maintainability and extensibility
• Stronger foundation for future workflow enhancements

🎯 Type of Change

• Refactoring
• Performance Improvement
• Code Quality Improvement

✅ Testing

• Verified drag-and-drop functionality across all columns
• Verified task status updates remain accurate
• Verified task position updates remain accurate
• Verified socket synchronization behavior remains unchanged
• Verified task creation and deletion workflows remain unaffected
• Verified task ordering remains consistent after movement
• Verified board rendering behavior remains stable

Fixes #215

Expected Labels

level3 NSoC'26

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