Implement offline mode for the Funkwhale UI
The following discussion from !2330 (merged) should be addressed:
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@wvffle started a discussion: (+3 comments) Well, you're most likely right when it comes to what @JuniorJPDJ has expected. However the issue itself is wrong. First commit before any of my changes also drops radio session when the candidate request fails.
We could make funkwhale aware of it's online/offline state, inform user about it and handle all cases similar to what @JuniorJPDJ is expecting.