Count failed loads as danger in hidden issues

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/submodule/status_test.go

@@ -1,6 +1,7 @@
 package submodule
 
 import (
+	"errors"
 	"slices"
 	"testing"
 )
@@ -69,3 +70,12 @@ func TestUntrackedRepositoryWording(t *testing.T) {
 		}
 	}
 }
+
+func TestHiddenIssuesCountLoadErrors(t *testing.T) {
+	bad := &Submodule{Err: errors.New("boom")}
+	loading := &Submodule{}
+	parent := &Submodule{Children: []*Submodule{bad, loading}}
+	if n, w := parent.HiddenIssues(); n != 1 || w != LevelDanger {
+		t.Errorf("got %d, %v; want 1, danger", n, w)
+	}
+}