Handle Retrieval Errors Nicely

[AdalynBlack]

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Extension information

All

Steps to reproduce

N/A

Miru version

1.8.1

Other details

This isn't necessarily an issue, more a feature request, but it might be nice to have better error handling for when requests fail or otherwise don't behave as expected. In the previous issue I made, #209, I was unable to favorite the show I was researching because of a partial API failure. With proper data validation though, the page could still be allowed to open so that the description can be viewed, favorites made, etc. As is, I am unable to do either of those things because of the episode error. Instead, this error could be relegated elsewhere, like an in-app notification/banner, or even just in the episodes section itself for a quick and dirty fix. I whipped up a quick demo showing that latter option just to show how it looks in-app:

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.