Best possible rendering in ghostty/tmux

Signed-off-by: David Gageot <david.gageot@docker.com>

Author: dgageot

pkg/tui/components/scrollbar/scrollbar.go

@@ -35,7 +35,7 @@ func New() *Model {
 	return &Model{
 		width:     Width,
 		trackChar: "⎪",
-		thumbChar: "┃",
+		thumbChar: "⎪",
 	}
 }