Bold the startup banner on TTY; blank line after banner

internal/ui/ui_test.go

@@ -26,7 +26,7 @@ func TestMessageMethodsPlain(t *testing.T) {
 		{"Error", func(w *Writer) { w.Error("boom") }, "🛑 ERROR: boom\n"},
 		{"Progress", func(w *Writer) { w.Progress("p") }, "  》 p\n"},
 		{"Detail", func(w *Writer) { w.Detail("d") }, "  》 d\n"},
-		{"Banner", func(w *Writer) { w.Banner("hello") }, "hello\n"},
+		{"Banner", func(w *Writer) { w.Banner("hello") }, "hello\n"}, // plain mode, no bold
 	}
 
 	for _, tt := range tests {
@@ -69,6 +69,15 @@ func TestColorOutputContainsANSI(t *testing.T) {
 	}
 }
 
+func TestBannerBoldWhenColor(t *testing.T) {
+	w, buf := newTestWriter(true)
+	w.Banner("hello")
+	out := buf.String()
+	if !strings.Contains(out, "\033[1m") {
+		t.Errorf("expected bold ANSI escape in colored Banner output, got %q", out)
+	}
+}
+
 func TestValueFormattersPlain(t *testing.T) {
 	w, _ := newTestWriter(false)