Paging result rows had no keys and were matched by position: appended
pages and query diffs could not reuse row state. Keys derived from
dictionaryPath+offset+word are stable per row, and the paging source
collapses duplicate entries for one dictionary card: case and diacritic
alias variants of a headword share the normalized word, so entries are
deduplicated by dictionaryPath+word+offset before emitting.
OneWay
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