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* #5843: resolve LibreOffice semicolon-separated font fallback lists to first installed family * #5843: address review comments on font fallback list resolution * #5843: verify fallback list text on cache hit and accept Times New Roman in tests * #5843: bound the fallback lists read from a DOCX and reuse their classification A document could name thousands of fallback families in `w:ascii`/`w:hAnsi`. Nothing bounded that value, and the name-based rules (roman classification, Thai family, named substitutes) then scanned every candidate for each shaped piece, so opening the document took seconds. `w:ascii` and `w:hAnsi` now keep the leading families within MAX_FONT_NAME bytes, cut at a `;` so no name is split, as `w:cs`/`w:eastAsia` already bound their names. The family a real list would pick is kept: a LibreOffice list names a few families, well under the bound. The Thai-family and named-substitute answers are worked out once per list and kept in the fallback-list cache, keyed by the list text, so shaping no longer rescans candidates for every piece. Resolution still reads every candidate. A 500-paragraph document whose font names 20,000 candidates laid out in 10.8 s; bounded on read it takes 17 ms. Tests: - a hostile fallback list keeps its leading families, cut on a `;` - a real LibreOffice list is read whole - a later Thai or named fallback still classifies, and lists are cached