Kyle Pope d6e4938aa4 Fix task assignment visibility: show column always, wire detail panel
- TaskRow: Show 'unassigned' label (muted) instead of invisible dash
  so the assigned column is always visible in the task list.
- TaskDetailPanel: Replace old person_id dropdown with assignment chips
  showing avatar + name for each assignee. Unassigned shows muted text
  instead of a dash.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-17 04:23:20 +08:00
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