Discovery errors

[vytick]

Show new UI for discovery errors

Cases to handle:

Regular

• open app no internet
• go through discovery and then no internet
• All backends are down

Remember mode

• open app no internet

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Design here

[matejkriz]

Together with this issue we should investigate how we handle different discovery errors and what errors we silently catch without reporting to the users and sentry. Because we observed not all accounts discovered without any errors.