Replace hand-rolled enrichedDocuments year-divider logic with the shared
groupDocuments utility. Also fixes a timezone bug in documentYears: adds
'T12:00:00' to date strings so getFullYear() doesn't drift on UTC boundaries.
No behavior change — year dividers render the same way as before.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Mirrors the existing sort allowlist pattern. Any value other than 'asc' or
'desc' silently falls back to 'desc', preventing arbitrary strings from
reaching the search API.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
text-xs text-ink/40 (~2.1:1) fails WCAG AA; text-sm bold at text-ink/60
(~3.7:1) passes the large-text 3:1 threshold. Also adds role="separator"
and aria-label so screen readers announce the group boundary.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add failing test for DATE-sort + undated doc showing "Undatiert" fallback
label, then fix DocumentList by null-coalescing sort before comparison
((sort ?? 'DATE') === 'DATE'). Test uses one dated + one undated doc to
produce two groups and trigger GroupDivider rendering.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Documents sorted by DATE show year dividers, SENDER/RECEIVER sort
shows person name dividers. Dividers only appear when there are 2+
distinct groups. Multi-receiver docs appear in each receiver group.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
