Weather app needs to show time weather was acquired

[hrmckay]

Verification

• [X] I searched for similar issues (including closed issues) and found none was relevant.

Introduce the issue

I like the weather app but sometimes weather data will 'stall'. I have noticed on many smartwatches from the Pebble up to WearOS that sometimes the weather is not updated for several hours.

Preferred solution

On the weather page there should be the time the weather data was acquired, or a comment indicating this, eg. '2 hours old'.

Version

a2356f2f