Spreadsheet relation filters now use the shared cached lookup mechanism when showing record names. This keeps the enterprise spreadsheet code aligned with the main platform change and can reduce repeated data requests, improving responsiveness without changing user workflows.

This commit adapts enterprise code to https://github.com/odoo/odoo/pull/206464

Task: 4735879

The VoIP code was reorganized to use standard browser capabilities directly instead of relying on an internal wrapper. This is an internal cleanup that should make the feature easier to maintain without changing how users make or receive calls.

In the past, all browser function/objects were used through the `browser` object. Now, the only property that you need to use through `browser` is `location`. For everything else you can use global functions/objects by calling them directly.