soap box, soap dish

This is a cute soap dish.
Already fix some issues：2026/2/3
Add a recessed groove to tell the top from the bottom, making it easier to orient the tray with the better-printing surface facing upward.
Slightly enlarge the soap tray to reduce the gap between the tray and the box.
Reduce the size of the filleted feet around the bottom of the soap box to ensure stable printing results.
Reduce the recessed depth at the corners of the soap box to improve minor water pooling.