Fix Button controls remaining in pressed state on Windows touch screens

[Copilot]

This PR fixes an issue where Button and Border controls inside ScrollView remain stuck in "Pressed" visual state when touched and dragged outside their bounds on Windows touch screen devices.

Problem

The issue occurs because ButtonHandler.Windows.cs only listens to PointerPressed and PointerReleased events on the button itself. When a user touches a button and drags their finger outside the button bounds, the PointerReleased event is not fired on the button, leaving it permanently in the pressed state.

This creates a poor user experience on touch devices where users expect buttons to return to their normal state when they move their finger away from the button area.

Solution

Added two new event handlers to ButtonHandler.Windows.cs:

1. OnPointerExited - Clears the pressed state when the pointer leaves the button bounds
2. OnPointerCanceled - Clears the pressed state when the pointer interaction is interrupted

Both handlers check the _isPressed state before calling VirtualView?.Released() to avoid unnecessary work. The handlers are properly registered in ConnectHandler and cleaned up in DisconnectHandler.

Code Changes

void OnPointerExited(object sender, PointerRoutedEventArgs e)
{
    // Clear pressed state when pointer exits the button bounds
    if (_isPressed)
    {
        _isPressed = false;
        VirtualView?.Released();
    }
}

void OnPointerCanceled(object sender, PointerRoutedEventArgs e)
{
    // Clear pressed state when pointer is canceled
    if (_isPressed)
    {
        _isPressed = false;
        VirtualView?.Released();
    }
}

Testing

• Added a Windows-specific unit test to validate the pressed state behavior
• Created a comprehensive manual test case (Issue25.xaml) that demonstrates the fix with interactive buttons and real-time status updates
• Verified that the core project builds successfully with the changes

The fix is minimal, focused, and follows established patterns in the MAUI codebase. It ensures buttons behave consistently with modern touch UI expectations without affecting other platforms or interaction methods.

Fixes #25.

Warning

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