[Feature Request] [Messages GUI] Phone speaker mode toggle

[thyttan]

Would be neat to be able to toggle the phones (Android in my case) speaker calling mode from the watch screen when answering a call from the wrist. So a button in the UI for doing that is what I suggest.

[hiSandog]

This would be a nice feature, but it likely depends on what the Android companion app can control during an active call. It would help to first confirm whether speakerphone state can be toggled through the existing message/phone integration API and what permissions are required. If the phone cannot expose that control, the watch UI should hide or disable the button rather than showing a non-working action.