Hero state (no senderId): centred CorrespondenzHero with discovery
headline, cross-link, large typeahead, recent persons. No person bar
or filter controls shown. Results state (senderId set): full-width
strips then content area with max-w-7xl responsive padding matching
other overview pages. Removes focus delegation hack.
Refs: #179
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
New centred hero component for the Briefwechsel page: headline
"Wessen Briefe möchten Sie lesen?", cross-link to document search,
h-14 PersonTypeahead, and recent persons chips. Adds `large` prop
to PersonTypeahead and `conv_hero_crosslink` message key.
Refs: #179
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Update all internal links (AppNav, CoCorrespondentsList, goto) to the
new URL. No redirect needed — no production URLs exist yet.
Refs: #179
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
