Sixteen tests covering the four-column drawer: details column always
renders, persons column branches (no-persons placeholder vs sender
vs receivers), receiver overflow + show-all toggle, tags column
branches (placeholder vs anchor list with /?tag href encoding),
geschichten column visibility (hidden by default, shown for
canBlogWrite, attach link gated on canBlogWrite + documentId, list
rendering, show-all overflow), inferred-relationship pill on the
single-receiver branch.
Refs #496.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
