Short comma-separated key hints everywhere; write down what is left to build

tui/frame.go

@@ -214,9 +214,10 @@ func keyHint(keys, what string) string {
 	return k + " " + w
 }
 
-// hintLine joins key hints with a dot, dropping the ones that do not apply.
+// hintLine joins key hints with a comma, because a footer is a list of keys and
+// not a sentence.
 func hintLine(hints []string, width int) string {
-	joined := strings.Join(hints, dimStyle().Render(" · "))
+	joined := strings.Join(hints, dimStyle().Render(", "))
 	if lipgloss.Width(joined) > width {
 		return truncateVisible(joined, width)
 	}