Marcel a52d481a8e feat(relativeTime): add relativeYearsDe helper for historical letter dates ...

The correspondence timeline labels each row with its distance from today
("vor 86 Jahren"). Uses calendar-field math so the anniversary day
flips exactly — an ms-based 365.25d average misses by a day on leap
years. Invalid / future dates return "" so the caller can hide the
label rather than print "vor 0 Jahren".

Refs #305

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-04-23 21:38:56 +02:00

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