chain network name display fixed

frontend/pshared/lib/data/mapper/payment/enums.dart

@@ -83,7 +83,9 @@ String fxSideToValue(FxSide side) {
 }
 
 ChainNetwork chainNetworkFromValue(String? value) {
-  switch (value) {
+  final raw = value ?? '';
+  final normalized = _normalizeChainNetwork(raw);
+  switch (normalized) {
     case 'ethereum_mainnet':
       return ChainNetwork.ethereumMainnet;
     case 'arbitrum_one':
@@ -95,7 +97,7 @@ ChainNetwork chainNetworkFromValue(String? value) {
     case 'unspecified':
       return ChainNetwork.unspecified;
     default:
-      throw ArgumentError('Unknown ChainNetwork value: $value');
+      throw ArgumentError('Unknown ChainNetwork value: $raw');
   }
 }
 
@@ -114,6 +116,19 @@ String chainNetworkToValue(ChainNetwork chain) {
   }
 }
 
+String _normalizeChainNetwork(String value) {
+  final trimmed = value.trim();
+  if (trimmed.isEmpty) {
+    return 'unspecified';
+  }
+  final lower = trimmed.toLowerCase();
+  const prefix = 'chain_network_';
+  if (lower.startsWith(prefix)) {
+    return lower.substring(prefix.length);
+  }
+  return lower;
+}
+
 InsufficientNetPolicy insufficientNetPolicyFromValue(String? value) {
   switch (value) {
     case 'block_posting':