Adds the Java half of the honest date label — formatTitleDate(date,
precision, end, raw) — mirroring the frontend formatDocumentDate rules so an
import title never shows a precision the data lacks (MONTH → "Juni 1916", not
a fabricated day). Both implementations are pinned to the shared
docs/date-label-fixtures.json table, which this test asserts case-by-case, so
they cannot drift. Java's de CLDR renders the same "Jan."/"Dez." abbreviations
and en-dash the TS side produces.
Refs #666
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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