Platforms Impacted

• iOS
• visionOS
• macOS

Description of changes

As we prepare to move FluentTheme to macOS, we first need to clean up some upcoming name collisions. The biggest culprit are the little-used ColorSet and DynamicColor, used by Avatar and BadgeView.

Once the port is complete, we will remove these classes entirely and replace them with FluentTheme-compatible equivalents. For now, let's just avert the name collision to ease with porting.

Binary change

n/a, only renaming classes.

Verification

Ran full automation locally -- all looks right and renders as expected.

Visual Verification

Light	Dark

Pull request checklist

This PR has considered:

• Light and Dark appearances
• iOS supported versions (all major versions greater than or equal current target deployment version)
• VoiceOver and Keyboard Accessibility
• Internationalization and Right to Left layouts
• Different resolutions (1x, 2x, 3x)
• Size classes and window sizes (iPhone vs iPad, notched devices, multitasking, different window sizes, etc)
• iPad Pointer interaction
• SwiftUI consumption (validation or new demo scenarios needed)
• Objective-C exposure (provide it only if needed)

Microsoft Reviewers: Open in CodeFlow