Check a set's lesson ids for shapes that guarantee a wrong display order
under lexicographic sorting. Returns warning-tier issues (never errors):
mixed NN- prefix presence, inconsistent prefix digit widths, and
lexicographic-vs-numeric divergence (kapitel-10 displaying before
kapitel-2). An empty or single-id set yields no issues.
Check a set's lesson ids for shapes that guarantee a wrong display order under lexicographic sorting. Returns warning-tier issues (never errors): mixed
NN-prefix presence, inconsistent prefix digit widths, and lexicographic-vs-numeric divergence (kapitel-10displaying beforekapitel-2). An empty or single-id set yields no issues.