Use unicase for full Unicode case folding of custom words#274
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Replace per-lookup to_lowercase() with unicase::eq / UniCase<String> for the custom word allowlist, flag words, and TextDictionary. This collapses pairs that Rust's default case mapping leaves distinct (ß <-> SS, Greek Σ/σ/ς), and lets stored words keep their original casing instead of being silently lowercased on insert.
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Replace per-lookup to_lowercase() with unicase::eq / UniCase for the custom word allowlist, flag words, and TextDictionary. This collapses pairs that Rust's default case mapping leaves distinct (ß <-> SS, Greek Σ/σ/ς), and lets stored words keep their original casing instead of being silently lowercased on insert.