Show a loading circle for extension install screen

[Patriarch9307]

Describe your suggested feature

When opening extension install screen after a cold boot of the app, it takes a moment to load the list. There should be a loading circle indicating that it is doing something.

Other details

So this message can not be missinterpreted

https://user-images.githubusercontent.com/108529338/230248525-677ccb60-672e-49b8-95e6-b9c24a487c4c.mp4

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• [X] I have written a short but informative title.
• [X] If this is an issue with an extension, I should be opening an issue in the extensions repository.
• [X] I have updated the app to version 0.14.1.7.
• [X] I will fill out all of the requested information in this form.