Memory Leak Fix: Ime state handling

[PavloNetrebchuk]

Problem
The isImeVisibleState() function was causing memory leaks in EditProfileFragment due to improper cleanup of ViewTreeObserver.OnGlobalLayoutListener.

Solution
Replaced the problematic ViewTreeObserver approach with Compose's native WindowInsets.ime:

Benefits
✅ No memory leaks - Uses Compose's built-in insets system
✅ Automatic cleanup - LaunchedEffect handles lifecycle properly
✅ More reliable - Native Compose approach vs ViewTreeObserver
✅ Better performance - No manual listener management

Testing
✅ Memory profiler shows no more leaks in EditProfileFragment
✅ Keyboard detection still works for UI padding adjustments
✅ All existing functionality preserved

[openedx-webhooks]

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[volodymyr-chekyrta]

LGTM 👍