v0.48.0

Added

• Multi-person assignment: tasks and calendar events can now be assigned to multiple family members simultaneously. A new task_assignments / event_assignments join table (migration v32) stores the assignments; existing single-user data is migrated automatically.
• Avatar stack: task cards, Kanban cards, and the calendar agenda view display stacked avatars for all assigned users (up to 3 visible, then a +N overflow badge).
• Shared UserMultiSelect component (public/components/user-multi-select.js): checkbox-based dropdown used in both the task modal and the calendar event modal; replaces the previous single-user select element.
• assigned_to filter extended: GET /api/v1/tasks?assigned_to= and GET /api/v1/calendar?assigned_to= now match any task/event where the user appears in the assignments list.

Changed

• API response for tasks and calendar events now includes assigned_users: [{id, display_name, color}] array alongside the legacy assigned_to / assigned_name / assigned_color fields.
• Recurring task completion copies all multi-person assignments to the new recurring instance.