CW-1103:Token Validation Issues (#2327)

* feat(token_validation): Improve flow for adding new tokens across wallets

This change:
- Implements check to see if a token is already added, preventing duplicates
- Triggers dialog warning if its a duplicate token
- Takes EVM Chains contract adddress case-insensitivity when making checks for potential scams.

* refactor(token_validation): Modify token management flow

This change:
- Removes duplicate token check during token addition in EVMChainWalletBase.
- Introduces a flag to indicate if a token is being edited
- Adjusts token addition validation to bypass checks when editing an existing token.

* Update lib/src/screens/dashboard/edit_token_page.dart

---------

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_evm/lib/evm_chain_wallet.dart

@@ -198,8 +198,8 @@ abstract class EVMChainWalletBase
     for (var token in erc20Currencies) {
       bool isPotentialScam = false;
 
-      bool isWhitelisted =
-          getDefaultTokenContractAddresses.any((element) => element == token.contractAddress);
+      bool isWhitelisted = getDefaultTokenContractAddresses
+          .any((element) => element.toLowerCase() == token.contractAddress.toLowerCase());
 
       final tokenSymbol = token.title.toUpperCase();
 
@@ -214,6 +214,16 @@ abstract class EVMChainWalletBase
         token.iconPath = null;
         await token.save();
       }
+
+      // For fixing wrongly classified tokens
+      if (!isPotentialScam && token.isPotentialScam) {
+        token.isPotentialScam = false;
+        final iconPath = CryptoCurrency.all
+            .firstWhere((element) => element.title.toUpperCase() == token.symbol.toUpperCase())
+            .iconPath;
+        token.iconPath = iconPath;
+        await token.save();
+      }
     }
   }