This change reorganizes parts of the Point of Sale interface so popups, notifications, sound, and debug tools are managed separately instead of being bundled into one large screen component. The expected business benefit is easier maintenance and future development, with little to no direct change for end users.

*: pos_hr_restaurant, pos_restaurant

This commit continues the work of simplifying the Chrome component, it
moves the popup controller and the notification to their own component
and service, and moves the state of the notification, sound and debug
widget into their own services.

The Point of Sale IoT module was updated to stay aligned with recent changes in the core Point of Sale app. This helps ensure IoT-connected POS features continue working smoothly after internal code reorganizations.

The code of the point of sale has ranamed and moved some things, this commit adapts the code of pos_iot to match.