Fix toolbar flashing during navigation back with keyboard showing

[Copilot]

The toolbar was flashing when navigating back from a navigation controller while the keyboard remained visible. This occurred because reloadInputViews() (Swift) and addToolbarIfRequired (Objective-C) were being called unnecessarily during navigation transitions, causing the toolbar to be recreated and creating a visual flash.

Root Cause

The issue was in the scroll animation completion blocks in both implementations:

Swift version:

}, completion: {
    if scrollView is UITableView || scrollView is UICollectionView {
        textInputView.reloadInputViews() // <- Caused flash during navigation
    }
})

Objective-C version:

} completion:^(BOOL finished){
    if ([superScrollView isKindOfClass:[UITableView class]] || [superScrollView isKindOfClass:[UICollectionView class]]) {
        if ([strongSelf privateIsEnableAutoToolbar] == YES) {
            [strongSelf addToolbarIfRequired]; // <- Caused flash during navigation
        }
    }
}];

Solution

Added checks to detect when interactive navigation gestures are active and skip toolbar recreation during those periods:

• Swift: Uses existing activeConfiguration.rootControllerConfiguration.isInteractiveGestureActive
• Objective-C: Checks interactivePopGestureRecognizer.state for .began and .changed states

Testing

To reproduce and verify the fix:

1. Focus on a text field with toolbar enabled (e.g., in SearchViewController)
2. Navigate to next screen using navigationController.pushViewController
3. Navigate back via swipe gesture or back button while keyboard is showing
4. Toolbar should remain stable without flashing

Impact

• Eliminates visual toolbar flash during navigation transitions
• Preserves all existing keyboard management functionality
• Uses existing gesture detection mechanisms
• Minimal code changes with no breaking changes

Fixes #2102.

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