func (p DialogPainter) PaintDialog(canvas widget.Canvas, ps dialog.PaintState) {
	if ps.Bounds.IsEmpty() {
		return
	}

	colors := ps.ColorScheme
	if colors == (dialog.DialogColorScheme{}) {
		colors = p.resolveColors()
	}

	// iOS alert: heavy rounded corners, no border.
	canvas.DrawRoundRect(ps.Bounds, colors.Surface, cupDlgRadius)

	// Title (centered, bold).
	if ps.Title != "" {
		titleBounds := geometry.Rect{
			Min:	geometry.Pt(ps.Bounds.Min.X+cupDlgPadding, ps.Bounds.Min.Y+cupDlgPadding),
			Max:	geometry.Pt(ps.Bounds.Max.X-cupDlgPadding, ps.Bounds.Min.Y+cupDlgPadding+cupDlgTitleHeight),
		}
		canvas.DrawText(ps.Title, titleBounds, cupDlgTitleFontSize, colors.Title, true, cupDlgTextAlignCenter)
	}

	// Action buttons (right-aligned, accent color text).
	p.paintActions(canvas, ps, colors)

	// Focus indicator.
	if ps.Focused {
		ringBounds := ps.Bounds.Expand(cupDlgFocusRingOffset)
		ringRadius := cupDlgRadius + cupDlgFocusRingOffset
		canvas.StrokeRoundRect(ringBounds, colors.ActionFg.WithAlpha(cupDlgFocusRingAlpha), ringRadius, cupDlgFocusRingStroke)
	}
}

type DialogPainter struct {
	Theme *Theme	// nil uses default system blue fallback
}