Fix complete app breakage due to BString serialization #4658
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As a follow-up to #4657, this brings back previously reverted improvements and assures that BString will never be serialized as sequence of bytes, something the UI will not be able to interpret as string.
This PR will also put safeties in place to assure an over-eager future me does that again.
Tasks
BStringcannot be mis-interpreted againNotes
Previously I managed to not correctly communicate in code the
BStringserialization 'specialty' (it serializes as array of bytes), and managed to undo it in a refactoring step. Now this case is handled by its own type which would make it very hard for me or others to make the same mistake - now it's clearly communicate why the type exists.It's also a nice marker that signals that the backend (which probably should be frontend agnostic eventually) is using frontend specific types in its API.