fix : stored navigation tracking data instead of discarding it

[tmdeveloper007]

Summary of What Has Been Done

Fixed the track_navigation_flow method in src/utils/ui_enhancement.py which was building a tracking record but never storing it, causing all navigation tracking data to be silently discarded.

Changes Made

1. Added self.navigation_history: List[Dict] = [] to the UIEnhancementManager.__init__ method
2. Modified track_navigation_flow to append each record to self.navigation_history before returning it
3. Added a new get_navigation_history(user_id: str) -> List[Dict] method to retrieve a user's navigation history

Impact it Made

• Navigation tracking data is now actually persisted for UX analysis
• Enables user behavior analytics and path optimization features
• Fixes a silent data loss bug where all tracking calls were no-ops

Closes #1337

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