Fix cell_len crash when string ends with ZWJ#3952

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ChimdumebiNebolisa wants to merge 2 commits intoTextualize:masterfrom

ChimdumebiNebolisa:fix-3947-zwj

Commits on Feb 1, 2026

style: format zwj cell_len regression test (refs #3947)
ChimdumebiNebolisa
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fix: avoid StopIteration on trailing zero-width joiner (refs #3947)
ChimdumebiNebolisa
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