Sign managers now have a dedicated configuration menu item to add, edit, and delete tags. This makes tag management easier to find and helps teams keep signing templates organized without relying on technical navigation.

Sign managers can now add, edit, and delete tags using a new configuration menu item.

task-2978958

This fixes an issue that prevented users from dragging and dropping kanban items correctly in Firefox. It restores expected editing behavior in Studio, helping users manage views without switching browsers.

This PR follows a commit of the same name in community that assigns a dedicated 'o_dragged' class to elements dragged using the `draggable_hook_builder`.

- Adaptation of: https://github.com/odoo/odoo/pull/104128
- Community PR: https://github.com/odoo/odoo/pull/105353