- Add InboxView.vue with full CRUD UI
- Add inbox to navigation (first item)
- Support filtering by status/type
- Show stats (due today, overdue, etc.)
- Quick status updates with checkbox
- Priority indicators and overdue warnings
- New UsersView for managing organization members
- Role badges with colors (CEO, CRM Admin, Manager, User)
- Create/invite users, edit, deactivate, delete, reset password
- Navigation only visible for owner/admin roles