Format numbers fix

DiunaBI.UI.Shared/Services/NumberFormatHelper.cs

@@ -0,0 +1,50 @@
+using System.Globalization;
+
+namespace DiunaBI.UI.Shared.Services;
+
+public class NumberFormatHelper
+{
+    private readonly CultureInfo _culture;
+
+    public NumberFormatHelper()
+    {
+        // Always use Polish culture for number formatting
+        _culture = CultureInfo.GetCultureInfo("pl-PL");
+    }
+
+    public string FormatNumber(double? value, int decimals = 2)
+    {
+        if (!value.HasValue)
+            return string.Empty;
+
+        return value.Value.ToString($"N{decimals}", _culture);
+    }
+
+    public string FormatNumber(double value, int decimals = 2)
+    {
+        return value.ToString($"N{decimals}", _culture);
+    }
+
+    public string FormatInteger(double? value)
+    {
+        if (!value.HasValue)
+            return string.Empty;
+
+        return value.Value.ToString("N0", _culture);
+    }
+
+    public string FormatInteger(double value)
+    {
+        return value.ToString("N0", _culture);
+    }
+
+    public string GetCultureName()
+    {
+        return _culture.DisplayName;
+    }
+
+    public CultureInfo GetCulture()
+    {
+        return _culture;
+    }
+}