fix: SPL token balance display for xstocks and non-6-decimal tokens (#3052)

cw_solana/lib/solana_balance.dart

@@ -7,12 +7,15 @@ class SolanaBalance extends Balance {
       BigInt.from(int.tryParse(balance.toStringAsFixed(isToken ? 6 : 9).replaceFirst(".", "")) ?? 0),
       BigInt.from(int.tryParse(balance.toStringAsFixed(isToken ? 6 : 9).replaceFirst(".", "")) ?? 0));
 
+  // Using raw amount from RPC to avoid decimals mismatch for SPL tokens.
+  SolanaBalance.forToken(BigInt rawAmount, double uiAmount)
+      : balance = uiAmount,
+        super(rawAmount, rawAmount);
+
   final double balance;
 
-  @override
   String get formattedAdditionalBalance => _balanceFormatted();
 
-  @override
   String get formattedAvailableBalance => _balanceFormatted();
 
   String _balanceFormatted() {

cw_solana/lib/solana_client.dart

@@ -111,22 +111,24 @@ class SolanaWalletClient {
         return null;
       }
 
-      // Sum the balances of all accounts with the specified mint address
-      double totalBalance = 0.0;
+      // Sum raw amounts and ui amounts across all token accounts
+      BigInt totalRaw = BigInt.zero;
+      double totalUi = 0.0;
 
       for (var tokenAccount in tokenAccounts) {
         final tokenAmountResult = await _provider!.request(
           SolanaRPCGetTokenAccountBalance(account: tokenAccount.pubkey),
         );
 
-        final balance = tokenAmountResult.uiAmountString;
+        final raw = BigInt.tryParse(tokenAmountResult.amount) ?? BigInt.zero;
+        totalRaw += raw;
 
-        final balanceAsDouble = double.tryParse(balance ?? '0.0') ?? 0.0;
-
-        totalBalance += balanceAsDouble;
+        final ui = tokenAmountResult.uiAmount ??
+            (double.tryParse(tokenAmountResult.uiAmountString ?? '0') ?? 0.0);
+        totalUi += ui;
       }
 
-      return SolanaBalance(totalBalance, true);
+      return SolanaBalance.forToken(totalRaw, totalUi);
     } catch (_) {
       if (throwOnError) {
         rethrow;

cw_solana/lib/solana_wallet.dart

@@ -588,7 +588,8 @@ abstract class SolanaWalletBase
       for (final entry in results) {
         final token = entry.key;
         final fetchedBalance = entry.value;
-        final currentBalance = balance[token] ?? SolanaBalance(0.0, true);
+        final currentBalance = balance[token] ??
+            SolanaBalance.forToken(BigInt.zero, 0.0);
         balance[token] = fetchedBalance ?? currentBalance;
       }
     }
@@ -636,7 +637,7 @@ abstract class SolanaWalletBase
     if (token.enabled) {
       final tokenBalance = await _client.getSplTokenBalance(token.mintAddress, solanaAddress) ??
           balance[token] ??
-          SolanaBalance(0.0, true);
+          SolanaBalance.forToken(BigInt.zero, 0.0);
 
       balance[token] = tokenBalance;
     } else {