test(03-02): add failing tests for WaitType display in vmux list

- TestDisplayWaitTypePermission, TestDisplayWaitTypeQuestion
- TestDisplayWaitTypeEmpty, TestDisplayWorkingNoWaitType

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

display_test.go

@@ -236,6 +236,94 @@ func TestDisplayWithPreview(t *testing.T) {
 	}
 }
 
+// --- WaitType display tests ---
+
+func TestDisplayWaitTypePermission(t *testing.T) {
+	sessions := []SessionInfo{
+		{
+			PID:       100,
+			SessionID: "sess-1",
+			Cwd:       "/home/user/project",
+			State:     "Needs Input",
+			WaitType:  "permission",
+		},
+	}
+
+	var buf bytes.Buffer
+	DisplaySessionInfos(&buf, sessions, true, time.Now())
+	output := buf.String()
+
+	if !strings.Contains(output, "Needs Input: permission") {
+		t.Errorf("output should contain 'Needs Input: permission': %q", output)
+	}
+}
+
+func TestDisplayWaitTypeQuestion(t *testing.T) {
+	sessions := []SessionInfo{
+		{
+			PID:       100,
+			SessionID: "sess-1",
+			Cwd:       "/home/user/project",
+			State:     "Needs Input",
+			WaitType:  "question",
+		},
+	}
+
+	var buf bytes.Buffer
+	DisplaySessionInfos(&buf, sessions, true, time.Now())
+	output := buf.String()
+
+	if !strings.Contains(output, "Needs Input: question") {
+		t.Errorf("output should contain 'Needs Input: question': %q", output)
+	}
+}
+
+func TestDisplayWaitTypeEmpty(t *testing.T) {
+	sessions := []SessionInfo{
+		{
+			PID:       100,
+			SessionID: "sess-1",
+			Cwd:       "/home/user/project",
+			State:     "Needs Input",
+			WaitType:  "",
+		},
+	}
+
+	var buf bytes.Buffer
+	DisplaySessionInfos(&buf, sessions, true, time.Now())
+	output := buf.String()
+
+	if !strings.Contains(output, "[Needs Input]") {
+		t.Errorf("output should contain '[Needs Input]' without detail: %q", output)
+	}
+	if strings.Contains(output, ": ]") || strings.Contains(output, "Needs Input: ") {
+		t.Errorf("output should not have trailing colon when WaitType empty: %q", output)
+	}
+}
+
+func TestDisplayWorkingNoWaitType(t *testing.T) {
+	sessions := []SessionInfo{
+		{
+			PID:       100,
+			SessionID: "sess-1",
+			Cwd:       "/home/user/project",
+			State:     "Working",
+			WaitType:  "permission", // should be ignored for Working state
+		},
+	}
+
+	var buf bytes.Buffer
+	DisplaySessionInfos(&buf, sessions, true, time.Now())
+	output := buf.String()
+
+	if strings.Contains(output, "permission") {
+		t.Errorf("Working state should not show WaitType: %q", output)
+	}
+	if !strings.Contains(output, "[Working]") {
+		t.Errorf("output should contain '[Working]': %q", output)
+	}
+}
+
 func TestFormatDuration(t *testing.T) {
 	tests := []struct {
 		d    time.Duration