- TicketModel::getAllTickets() now accepts optional $user param and applies
getVisibilityFilter() so non-admin users cannot see internal/confidential
tickets they lack access to from the dashboard listing
- DashboardController passes $GLOBALS['currentUser'] to getAllTickets()
- clone_ticket.php: move Content-Type header to top so all error paths send
correct JSON content type
- AuthMiddleware: filter group names from HTTP header to [a-z0-9_-] only,
preventing header injection via malformed group names
- add_comment.php: return HTTP 201 on success, 500 in catch block
- update_comment.php, delete_comment.php: return 500 in catch blocks
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>