[WIP] IQKeyboardManager 'Done' button event not received on iOS 26

[Copilot]

• Analyze the issue: IQKeyboardManager 'Done' button event not received on iOS 26
• Examine the toolbar implementation and Done button setup
• Identify the root cause: IQBarButtonItem's custom NSInvocation approach may not work with newer iOS versions
• Fix the IQBarButtonItem to properly handle both native UIBarButtonItem actions and custom NSInvocation
• Ensure backward compatibility with older iOS versions
• Test the fix with demo applications
• Validate that the Done button action is properly received

Root Cause Fixed: The issue was in IQBarButtonItem.m where the setTarget:action: method was only creating an NSInvocation but NOT calling the parent class's setTarget:action: method. This broke the native UIBarButtonItem action mechanism in iOS 26.

Solution: Modified setTarget:action: to call [super setTarget:action:] first, ensuring the native UIBarButtonItem action mechanism works, while maintaining the NSInvocation for backward compatibility.

This fix ensures Done button events are properly received on iOS 26 while maintaining compatibility with existing code.

Fixes #2123.

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