Modal::beginFormDialog() for Create/Update, with proper affirmative/dismissive footer buttons and large modal sizeManageDiscussions only)ManageDiscussions permission for editing/deleting other members' discussionsobject_model/object_id columns on the comment table; updated to the current content_id relationuser_id form field; owner is now always assigned server-sideactionDelete/actionUpdate now return proper 403 (Forbidden) instead of relying solely on a generic exception for unauthorized usersactionGuest no longer returns a blank page for logged-in users; redirects to the standard indexuser_id, client_id, created_at->confirm() API instead of an unsupported raw data-confirm attributemedia, label, pull-right, col-xs-*, inline styles)create update buttons.deleteAccess() to use ManageContent::classhardDelete() instead of delete()