Time Bar: URL is required

### Widget link

https://github.com/glanceapp/community-widgets/blob/main/widgets/time-bar/README.md

### Description

I am getting an error for this widget:

`Config has errors: group widget: custom-api widget: URL is required`

Start with the time-bar README linked in the issue and reproduce the reported “URL is required” configuration error using its example. Compare the documented widget configuration with the failing setup; done means the time-bar widget loads without that validation error.

Written by the indexing model from the issue text.