Web Assembly Example - Qt Quick Control 2 rendering artifacts

Several UI rendering and functionality issues are present in the official Qt Quick Controls 2 WebAssembly example, particularly in the CheckBox and ComboBox components.

Checkbox Rendering Issues

•Checkboxes appear with corrupted or missing textures/icons instead of a proper checkmark.

•The disabled checkbox ("Third" option) does not have a proper visual distinction.

•Rendering artifacts appear on the checkmarks.

ComboBox Rendering Issue

•The ComboBox dropdown button appears with graphical corruption.

•The editable ComboBox's text input field has visual glitches.