Base fixes and test harness

PortfolioJournal/Views/Sources/AddSourceView.swift

@@ -185,18 +185,27 @@ struct AddSourceView: View {
     }
 
     private func parseDecimal(_ string: String) -> Decimal? {
+        let locale = CurrencyFormatter.locale(for: currencyCode)
         let cleaned = string
             .replacingOccurrences(of: currencySymbol, with: "")
-            .replacingOccurrences(of: ",", with: ".")
+            .replacingOccurrences(of: locale.groupingSeparator ?? "", with: "")
             .trimmingCharacters(in: .whitespaces)
 
         guard !cleaned.isEmpty else { return nil }
 
         let formatter = NumberFormatter()
         formatter.numberStyle = .decimal
-        formatter.locale = Locale(identifier: "en_US")
+        formatter.locale = locale
 
-        return formatter.number(from: cleaned)?.decimalValue
+        if let value = formatter.number(from: cleaned)?.decimalValue {
+            return value
+        }
+
+        let normalized = cleaned
+            .replacingOccurrences(of: locale.decimalSeparator ?? ",", with: ".")
+            .replacingOccurrences(of: ",", with: ".")
+        formatter.locale = Locale(identifier: "en_US_POSIX")
+        return formatter.number(from: normalized)?.decimalValue
     }
 
     private var currencySymbol: String {
@@ -206,6 +215,13 @@ struct AddSourceView: View {
         return AppSettings.getOrCreate(in: CoreDataStack.shared.viewContext).currencySymbol
     }
 
+    private var currencyCode: String {
+        if let account = selectedAccount, let code = account.currencyCode {
+            return code
+        }
+        return AppSettings.getOrCreate(in: CoreDataStack.shared.viewContext).currency
+    }
+
     private var selectedAccount: Account? {
         guard let id = selectedAccountId else { return nil }
         return availableAccounts.first { $0.safeId == id }