Fix math block scrolling

- Fix tiny scroll happening when not needed
- Fix horizontal scrolling for long equations

Author: mjbvz

src/vs/workbench/contrib/chat/browser/chatContentParts/media/chatMarkdownPart.css

@@ -14,4 +14,9 @@
 	h6 {
 		line-height: normal;
 	}
+
+	.katex-display .katex {
+		width: fit-content;
+		overflow: hidden;
+	}
 }