The default path through the function would be to propagate every
error. However, we want to inspect whether it is one very specific
error.
Make this clear in the code structure by having a dedicated `if let`
for the special case but keep using `?` afterwards.
- wallet feed that sends balance + current address
- display in UI (balance + address) in separate wallet component (shared for taker and maker for now)
Includes two seed files that are already funded with some testnet coins. We can share those for testing for now. If more funds are needed I'm happy to top them up.