Wrapping the editor with pointer-events-none was visual-only — keyboard users
could still tab into the contenteditable and type. Wire `editable: !disabled`
on the Tiptap Editor and a reactive `$effect` that calls setEditable when the
prop flips after mount; expose `aria-disabled="true"` on the wrapper so
screen readers announce the deactivated state.
Tests assert contenteditable=false and aria-disabled=true when disabled;
contenteditable=true otherwise.
Closes WCAG 2.1.1 / 4.1.2 — Felix #5615 + Leonie #5621 + Nora #5618 BLOCKER.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Mirrors MentionEditor for users but searches /api/persons?q=, allows
multi-word queries (delegated to detectPersonMention), displays life
dates next to each result, and uses min-h-[44px] rows for WCAG 2.2 AA
touch targets. Selection writes both the @DisplayName text and a
{personId, displayName} sidecar entry.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>