fix(memory): prevent memory leaks in IntersectionObserver and event l…

[awara-coder]

…isteners

Eliminates memory leaks that caused unbounded memory growth on component re-renders.

Changes:

1. projects.js - IntersectionObserver cleanup

   • Added module-level projectObserver variable
   • Disconnect previous observer before creating new one
   • Unobserve elements after animation completes
   • Added cleanupProjects() export for manual cleanup

2. mobileMenu.js - Event listener cleanup

   • Store event handler functions for proper removal
   • Auto-cleanup on reinitialization
   • Added cleanup() export for manual cleanup
   • Remove document-level listener to prevent accumulation

Memory Leak Impact:

• Before: IntersectionObserver accumulated on each populateProjects() call
• Before: Document click listener persisted indefinitely
• After: Observers properly disconnected and freed
• After: All event listeners can be cleanly removed

Performance Impact:

• Prevents unbounded memory growth
• Reduces DOM traversal overhead (.contains() on every click)
• Frees memory after animations complete
• Enables proper cleanup in SPA scenarios

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