fix table heading rendering (#1138)

packages/tui/internal/styles/markdown.go

@@ -284,7 +284,6 @@ func generateMarkdownStyleConfig(backgroundColor compat.AdaptiveColor) ansi.Styl
 		Table: ansi.StyleTable{
 			StyleBlock: ansi.StyleBlock{
 				StylePrimitive: ansi.StylePrimitive{
-					BlockPrefix: "\n",
 					BlockSuffix: "\n",
 				},
 			},