fr: Migrate deprecated CorePalette / Scheme APIs to CorePalettes + DynamicScheme

[carloscgm]

Existing issue?

• I checked the existing issues

What happened?

I’d like to propose a migration away from the now-deprecated APIs in material_color_utilities, specifically:

• CorePalette.fromList
• Scheme.lightFromCorePalette
• Scheme.darkFromCorePalette

These APIs have been replaced in recent versions by:

• CorePalettes
• DynamicScheme (and concrete implementations like SchemeTonalSpot)

Why this migration matters

1️⃣ Deprecated APIs

The current implementation relies on APIs that are officially deprecated upstream. This may lead to:

• Analyzer warnings
• Future breaking changes
• Eventual removal in upcoming versions of material_color_utilities
• Migrating now would future-proof the package.

2️⃣ Alignment with latest Material 3 architecture

The newer API is centered around:

• DynamicScheme
• Variant (TonalSpot, Expressive, Vibrant, etc.)
• Explicit control of contrastLevel
• CorePalettes instead of CorePalette

This reflects the direction Material 3 is moving toward, especially regarding dynamic color harmonization and scheme flexibility.

Relevant log output

When using the latest version of material_color_utilities, the following deprecation warnings are produced:

warning: 'CorePalette.fromList' is deprecated and shouldn't be used.
Use CorePalettes instead. (deprecated_member_use)

warning: 'Scheme.lightFromCorePalette' is deprecated and shouldn't be used.
Use DynamicScheme or a concrete Scheme implementation instead. (deprecated_member_use)

warning: 'Scheme.darkFromCorePalette' is deprecated and shouldn't be used.
Use DynamicScheme or a concrete Scheme implementation instead. (deprecated_member_use)