Consider a consistent icon tinting API instead of SwipeItem-only IconColor

Description

Related issue:
https://github.com/dotnet/maui/issues/36766

In the discussion above, adding a new SwipeItem.IconColor property for .NET 11 was mentioned as a possible solution.

While this would address the specific SwipeItem scenario, I am concerned that introducing an icon color API only for SwipeItem could create an inconsistency across MAUI controls.

Several controls display icons or images today, including:

• SwipeItem
• Button (ImageSource)
• Image
• ImageButton

If icon tinting is considered a supported scenario, it may be beneficial to provide a common approach that can be used consistently across controls rather than introducing a property that is specific to SwipeItem.

This would help developers:

• Reuse a single icon asset across multiple themes and visual states
• Reduce the number of image files that must be shipped with an application
• Simplify light and dark theme support
• Improve API consistency across MAUI controls

I am aware that CommunityToolkit provides IconTintColorBehavior for Image and ImageButton. However, this proposal is about providing a consistent built-in MAUI API across controls rather than relying on behaviors for some controls and dedicated properties for others.

Would the team consider a broader icon tinting strategy (for example, IconColor or TintColor) instead of introducing functionality only for SwipeItem?

Public API Changes

One possible approach could be introducing a common tinting/coloring property for controls that display icons or images.

Intended Use-Case

Many applications use monochrome icon assets that need to adapt to:

• Light and dark themes
• Different visual states
• Brand-specific color schemes
• Accessibility requirements

Today, developers often need to maintain multiple versions of the same icon, such as:

• icon_black.png
• icon_white.png
• icon_blue.png

With a built-in icon tinting API, a single image asset could be reused while the displayed color is controlled through XAML or code.

Example:

<Button
    ImageSource="ic_fluent_arrow_circle_left_24_filled.png"
    IconColor="White" />

<Image
    Source="ic_fluent_arrow_circle_left_24_filled.png"
    TintColor="Red" />

Start by reviewing related issue #36766 and the listed controls: SwipeItem, Button, Image, and ImageButton. The issue does not name implementation files or tests; done would require an agreed built-in tinting API that is consistent across applicable controls.