This fixes an issue that prevented users from completing document signing when SMS validation was required. The signing dialog now receives the correct information, allowing SMS-protected signature requests to proceed as expected.

In the SMSSignerDialog the signature process is made from a widget that
after filled and sent, finishes the signing process. However, when refactoring
this widget, the signature parameters was being passed wrongly. This blocks the
signing of any request that requires SMS validation. This commit fixes this issue
by passing the correct parameters to the init of the dialog.

The point-of-sale system now loads most required information in one combined request instead of many separate steps, which should make startup faster for shops. This update also modernizes the underlying POS technology and reorganizes related assets, improving maintainability across POS hardware, employee login, and country-specific fiscal integrations.

Part of https://github.com/odoo/odoo/pull/82461