observeUtxoCounts
Observe UTXO counts per token type (available UTXOs only).
Returns Flow that emits UTXO counts grouped by token type. Used for displaying "X UTXOs" in balance UI.
Matches Midnight SDK: .length on getAvailableCoins() result
Return
Flow of UTXO count maps (tokenType → count)
Parameters
address
Unshielded address