feat: support inner left content, fix formatting bug.

src/Ursa.Themes.Semi/Controls/NumericUpDown.axaml

@@ -51,6 +51,7 @@
                                 Foreground="{TemplateBinding Foreground}"
                                 IsReadOnly="{TemplateBinding IsReadOnly}"
                                 TextWrapping="NoWrap"
+                                InnerLeftContent="{TemplateBinding InnerLeftContent}"
                                 Theme="{DynamicResource NonErrorTextBox}"
                                 Watermark="{TemplateBinding Watermark}" />
                             <Panel

src/Ursa/Controls/NumericUpDown/IntUpDown.cs

@@ -44,8 +44,7 @@ public class NumericDoubleUpDown : NumericUpDownBase<double>
 
     protected override bool ParseText(string? text, out double? number)
     {
-        // Weird bug
-        var result = double.TryParse(text, out var value);
+        var result = double.TryParse(text, ParsingNumberStyle, NumberFormat, out var value);
         number = value;
         return result;
     }

src/Ursa/Controls/NumericUpDown/NumericUpDownBase.cs

@@ -82,7 +82,7 @@ public abstract class NumericUpDown : TemplatedControl
     }
 
     public static readonly StyledProperty<NumberStyles> ParsingNumberStyleProperty = AvaloniaProperty.Register<NumericUpDown, NumberStyles>(
-        nameof(ParsingNumberStyle));
+        nameof(ParsingNumberStyle), defaultValue: NumberStyles.Any);
 
     public NumberStyles ParsingNumberStyle
     {