ccbcbca0e8
Implements the inline-edit affordance from
docs/specs/stammbaum-tree-spec.html (section 3): a low-opacity
"+ Beziehung hinzufügen" button below the direct relationships list
expands into a compact form (type select, person typeahead,
optional Von/Bis Jahr inputs, Abbrechen + Speichern). On save the
form POSTs to /api/persons/{id}/relationships, reloads the panel's
own data, and calls invalidateAll() so the tree picks up the new
edge without a hard refresh.
The panel takes a new canWrite prop, plumbed through from the
+layout.server.ts data already exposed on page.data.
Also pins the /stammbaum canvas to the viewport (-my-6 cancels
<main>'s py-6, h-[calc(100dvh-4.25rem)] subtracts the navbar) so
the page no longer overflows below the fold.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>