List Project Task Shares
List all task shares across a project.
Returns a paginated list of all task shares for tasks within the project.
Shares for soft-deleted tasks are excluded.
**Filtering options:**
- `active`: Filter by active status (true/false/omit for all)
- `task_id`: Filter to shares for a specific task
- `task_name`: Filter by task name (case-insensitive partial match)
**Use cases:**
- Audit all public shares in a project
- Find active shares for a specific task
- Review all shares created by the team
