fix: add missing err checks and fix loop termination in tests

backend/handlers/bookings/bookings_test.go

@@ -2649,6 +2649,9 @@ func TestUserCancelBooking_PendingNoNotification(t *testing.T) {
 	var status string
 	err = tx.QueryRow(ctx,
 		"SELECT status FROM bookings WHERE id = $1", bookingID).Scan(&status)
+	if err != nil {
+		t.Fatalf("failed to query booking status: %v", err)
+	}
 	if status != "pending" {
 		t.Fatalf("expected booking status 'pending', got %s", status)
 	}
@@ -2731,6 +2734,9 @@ func TestUserCancelBooking_TransactionIntegrity(t *testing.T) {
 	var statusBefore string
 	err = tx.QueryRow(ctx,
 		"SELECT status FROM bookings WHERE id = $1", bookingID).Scan(&statusBefore)
+	if err != nil {
+		t.Fatalf("failed to query booking status before cancel: %v", err)
+	}
 	if statusBefore != "confirmed" {
 		t.Fatalf("expected status 'confirmed' before cancel, got %s", statusBefore)
 	}
@@ -2750,6 +2756,9 @@ func TestUserCancelBooking_TransactionIntegrity(t *testing.T) {
 	var statusAfter string
 	err = tx.QueryRow(ctx,
 		"SELECT status FROM bookings WHERE id = $1", bookingID).Scan(&statusAfter)
+	if err != nil {
+		t.Fatalf("failed to query booking status after cancel: %v", err)
+	}
 	if statusAfter == "confirmed" {
 		t.Error("booking status should have changed after cancellation (transaction should have committed)")
 	}