A balance refresh that returns now draws the balances on AddressDetail or
AddressToken again when that screen is up, not only the wallet list; their
transaction lists are left alone. A token added on AddToken reads `quantity
unknown` instead of 0.0000 until a refresh that started with it tracked has
fetched every address's token balances. To tell an address whose token
balances the explorer did not return, the refresh takes them off its copy of
the wallets before fetching.
Model: opus-5-5
