feat: make text looks like text.

src/Semi.Avalonia.ColorPicker/Controls/ColorPicker.axaml

@@ -506,6 +506,8 @@
                         Margin="8,0,0,0"
                         HorizontalAlignment="Left"
                         VerticalAlignment="Center"
+                        FontWeight="Regular"
+                        Foreground="{DynamicResource TextBlockDefaultForeground}"
                         Text="{Binding $parent[ColorPicker].Color}" />
                 </Grid>
             </Template>