Improve STTextRenderView layout to match actual rendering behavior

Adjusted layout() to calculate frame height based on originY and the
typographicBounds of each line, ensuring accurate dimensions that match how
content is drawn in draw(). Removed use of typographicBounds(in:) for layout
sizing and replaced with measured values from layout fragments. Also replaced
needsLayout/layout check in image() with layoutSubtreeIfNeeded() for correctness.