Updated several Odoo screens to use simpler title styling for kanban cards. This reduces unnecessary styling rules behind the scenes, helping keep the interface code lighter without changing business workflows.

This update modernizes the underlying editor and dialog components so they can be shared across more parts of Odoo, including Website and Studio. Business users should see little direct change, but it supports a more consistent editing experience and reduces duplicated legacy code.

This PR is the counterpart of odoo/odoo#139154 which converts the
AceEditor widget to owl. Doing so required to move the ResizablePanel
from web_studio to web, s.t. it can be used in website to wrap the newly
introduced ResourceEditor.