Add organization management UI pages:
- /dashboard: Org list with grid cards
- /dashboard/[slug]: Org overview with stats and previews
- /dashboard/[slug]/members: Member management with invites
- /dashboard/[slug]/settings: Org settings, leave, delete
- /invite/accept: Token-based invite acceptance flow
Includes shared org context layout for role detection, reusable
components (role-badge, confirm-dialog), and sidebar nav update.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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