Adds ComboBox dropdown background brush - #4059
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Introduces `MaterialDesign.Brush.ComboBox.DropDown.Background` to provide specific theming for the ComboBox and DataGridComboBox dropdown. This change moves away from relying on the general `MaterialDesign.Brush.Background` or a complex binding setup, allowing for consistent and explicit control over the dropdown's visual style. It also removes the `RemoveAlphaBrushConverter` usage for applying the background. Fixes #3887.
Refactors the ComboBox popup background UI test to use a direct helper for retrieving the color value. This eliminates the need for manual casting and null checks on the brush type, making the assertion more concise.
Updates the .NET SDK and various NuGet packages, including TUnit, Microsoft.CodeAnalysis, and CommunityToolkit.Mvvm. Refactors test assertions to use native TUnit methods like IsTrue, IsFalse, and IsNull for better clarity, and removes custom assertion extensions that are no longer required.
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Introduces a dedicated `DropDowns.Background` property to the `ComboBox` theme object, allowing programmatic control over the `MaterialDesign.Brush.ComboBox.DropDown.Background` brush. This formalizes the dropdown background as a configurable theme aspect within the `Theme` definition and sets its default values for light and dark themes.
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Introduces a dedicated theme resource,
MaterialDesign.Brush.ComboBox.DropDown.Background, to provide explicit control over the background color of ComboBox dropdowns.This change ensures consistent application of the dropdown background across various ComboBox styles, including those in DataGrids. It also simplifies the internal logic for how the popup background is applied, removing an unnecessary converter.
A new UI test verifies that the ComboBox popup correctly utilizes this dedicated background resource when no explicit background is set.
Fixes #3887