Refactor ColorPicker components and improve UI consistency (#795)

* feat: add converters and update bindings in ColorPicker components.

* feat: simplify ColorPicker layout by replacing complex structure with ColorView component.

* feat: remove CornerRadiusToDoubleConverter.

* feat: replace EnumToBoolConverter & ToColorModel with ObjectConverters.Equal.

* feat: set HexInputAlphaPosition to Trailing.

* feat: update ColorView layout and styling for improved UI consistency.

* feat: bind Increment property of ColorSliders to respective TickFrequency and Slider values.

* feat: update ColorView bindings to use new syntax and adjust CornerRadius for improved styling.

* feat: update ColorPicker SelectedIndex Mode to TwoWay.

* feat: sync upstream changes.

* feat: update ColorPicker and ColorView to use SemiColorPalette for improved color selection.

* feat: update ControlTemplate TargetType.

* feat: add AIPurple colors to Palette.

* refactor: display real Hex in HexColorPicker.

* fix: update ColorView bindings to handle null values with a converter.

* refactor: refactor ColorPicker demo.

* refactor: replace RelativeSource bindings with TemplateBinding in ColorView.

* chore: copy ColorView Template to ColorPicker.

* fix: update AlphaEnabled ToggleSwitch content to reflect correct label.

* fix: fix index order in ColorPicker.

src/Semi.Avalonia.ColorPicker/Properties/AssemblyInfo.cs

@@ -1,3 +1,5 @@
 using Avalonia.Metadata;
 
-[assembly: XmlnsDefinition("https://irihi.tech/semi", "Semi.Avalonia.ColorPicker")]
+[assembly: XmlnsPrefix("https://irihi.tech/semi", "semi")]
+[assembly: XmlnsDefinition("https://irihi.tech/semi", "Semi.Avalonia.ColorPicker")]
+[assembly: XmlnsDefinition("https://irihi.tech/semi", "Semi.Avalonia.ColorPicker.Converters")]