chore(spl): "SPL" -> "SOL" (we use both SPL and Token-2022 SOL tokens)

Author: sneurlax

lib/db/isar/main_db.dart

@@ -626,7 +626,7 @@ class MainDB {
 
   // ========== Solana =========================================================
 
-  // Solana (SPL) tokens.
+  // Solana tokens.
 
   QueryBuilder<SplToken, SplToken, QWhere> getSplTokens() =>
       isar.splTokens.where();

lib/models/isar/models/blockchain_data/transaction.dart

@@ -261,5 +261,5 @@ enum TransactionSubType {
   sparkSpend, // firo specific
   ordinal,
   mweb,
-  splToken, // Solana token (SPL).
+  splToken, // Solana token.
 }

lib/pages/add_wallet_views/add_token_view/add_custom_solana_token_view.dart

@@ -336,7 +336,7 @@ class _AddCustomSolanaTokenViewState
                 Padding(
                   padding: const EdgeInsets.only(left: 32),
                   child: Text(
-                    "Add custom SPL token",
+                    "Add custom SOL token",
                     style: STextStyles.desktopH3(context),
                   ),
                 ),
@@ -360,7 +360,7 @@ class _AddCustomSolanaTokenViewState
           children: [
             if (!isDesktop)
               Text(
-                "Add custom SPL token",
+                "Add custom SOL token",
                 style: STextStyles.pageTitleH1(context),
               ),
             if (!isDesktop) const SizedBox(height: 16),

lib/pages_desktop_specific/my_stack_view/wallet_view/sub_widgets/desktop_send_fee_form.dart

@@ -212,7 +212,7 @@ class _DesktopSendFeeFormState extends ConsumerState<DesktopSendFeeForm> {
                                           .estimateFeeFor(amount, feeRate);
                                     }
                                   } else {
-                                    // Token fee estimation (works for ERC20 and SPL tokens).
+                                    // Token fee estimation (works for ERC20 and SOL tokens).
                                     try {
                                       final tokenWallet = ref.read(
                                         pCurrentTokenWallet,

lib/services/price.dart

@@ -301,7 +301,7 @@ class PriceAPI {
     }
   }
 
-  /// Get prices and 24h change for Solana SPL tokens.
+  /// Get prices and 24h change for Solana SOL tokens.
   ///
   /// Uses CoinGecko API to fetch prices for tokens by their Solana mint addresses.
   /// Format: GET /api/v3/simple/token_price/solana?vs_currencies=usd&contract_addresses=mint1,mint2&include_24hr_change=true

lib/utilities/amount/amount_unit.dart

@@ -192,7 +192,7 @@ extension AmountUnitExt on AmountUnit {
       case AmountUnit.yocto:
       case AmountUnit.ronto:
       case AmountUnit.quecto:
-        // For SPL tokens, just use the symbol with the prefix if applicable.
+        // For SOL tokens, just use the symbol with the prefix if applicable.
         return token.symbol;
     }
   }