Improves upon https://github.com/zed-industries/zed/pull/42674 Before: <img width="520" height="202" alt="image" src="https://github.com/user-attachments/assets/efb1650b-4c0e-4424-8d9b-90de80c72df2" /> <img width="157" height="211" alt="image" src="https://github.com/user-attachments/assets/cf4605f3-88e5-4724-ad2b-1219ed04a945" /> After: <img width="529" height="208" alt="image" src="https://github.com/user-attachments/assets/382fd523-a3d9-4700-a8df-c339419fc6dc" /> <img width="133" height="208" alt="image" src="https://github.com/user-attachments/assets/f22b72d9-d416-47f9-92af-ea1de6fb5583" /> Release Notes: - Fixed an issue where Markdown tables would sometimes show double borders.