This update reorganizes the JavaScript behind Odoo's mail, chat, and live chat features to make conversations, messages, and chat windows easier to maintain and extend. Most changes are internal, but they lay groundwork for future improvements such as opening mailboxes in chat windows; one prior invitation notification behavior is noted as temporarily lost.

This update modernizes how company, contact, user, and CRM forms react when a state or region is selected. It reduces fragile workarounds in the system, making these forms easier to maintain and less likely to break during future updates.

This method leads to ugly hacks as [this one](https://github.com/Yajo/l10n-germany/commit/599221635f5f091954efed54ab44d53a90517852#diff-cb32caaa5c33bbc0caf735a300e39703R69), mangling with context, to make it compatible with new api ochanges. Let's just update it.