Show data loading indicator

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New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

When navigating between classes data browser is wiped and it's no obvious that fetching the data is in progress.

Feature / Enhancement Description

It would be good to show that data is loading. Showing skeleton is a good pattern and a standard already.

Example Use Case

https://www.freecodecamp.org/news/how-to-build-skeleton-screens-using-css-for-better-user-experience/

Alternatives / Workarounds

Showing existing loader.

3rd Party References

Facebook, Google, etc.

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