Don't count failed loads as loading; explain missing gitlink

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

internal/submodule/git/provider.go

@@ -158,7 +158,7 @@ func status(ctx context.Context, in info) (*submodule.Status, error) {
 	}
 	pin := parseGitlink(out)
 	if pin == "" {
-		return nil, errors.New("no gitlink in the superproject index")
+		return nil, errors.New("listed in .gitmodules, but has no gitlink in the superproject index (stale entry?)")
 	}
 	out, _, err = try(ctx, in.superDir, "ls-tree", "HEAD", "--", in.relPath)
 	if err != nil {

internal/tui/header/header.go

@@ -42,7 +42,9 @@ func View(t theme.Theme, repo *submodule.Repo, fetch Fetch, spinner string, widt
 	submodule.Walk(repo.Submodules, func(s *submodule.Submodule) {
 		total++
 		if s.Status == nil {
-			loading++
+			if s.Err == nil {
+				loading++
+			}
 			return
 		}
 		if s.Status.PinStaged {