fix: use dynamic era name in UtxoFailure error message (#1225)

Replace hardcoded 'Alonzo' with dynamic era name lookup using the era ID
stored in the UtxoFailure struct. This makes the error message format
consistent across all eras.

Closes #846

Signed-off-by: Chris Gianelloni <[email protected]>

Author: wolf31o2

ledger/error.go

@@ -299,8 +299,9 @@ func (e *UtxoFailure) UnmarshalCBOR(data []byte) error {
 }
 
 func (e *UtxoFailure) Error() string {
-	// TODO: lookup era name programmatically (#846)
-	return fmt.Sprintf("UtxoFailure (FromAlonzoUtxoFail (%s))", e.Err)
+	// Dynamically determine era name using the era ID from the struct
+	eraName := GetEraById(e.Era).Name
+	return fmt.Sprintf("UtxoFailure (From%sUtxoFail (%s))", eraName, e.Err)
 }
 
 type UtxoFailureErrorBase struct {