Card grids with accent stripes in pptxgenjs

For a 3-tile grid where titles may wrap to 1 or 2 lines, anchor the description text at a fixed y-offset from the tile top rather than relative to the title height — descriptions stay horizontally aligned across tiles even when titles wrap unevenly. Also: ROUNDED_RECTANGLE breaks accent-stripe overlays (the rectangular stripe leaves visible square corners outside the rounded card), so use plain RECTANGLE when you want a left/top accent bar.