SeslSubheaderRoundedCorner
Provides rounded corners for subheaders. This class extends SeslRoundedCorner to implement rounded corners specifically for subheader elements. It handles the drawing of rounded corners based on the view's position and dimensions. The rounded corners can be applied to any combination of the four corners (top-left, top-right, bottom-left, bottom-right) as specified by the `mRoundedCornerMode` flag.