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Expert guide and lookup reference for Flutter framework versions, widget deprecations, API replacements, and Material 3 migrations from Flutter 1.0 to modern Flutter (3.24+). Use this skill whenever writing, reviewing, refactoring, or debugging Flutter UI, widgets, styling, or theming to ensure non-deprecated modern Flutter 3.24+ APIs are used (e.g. Color.withValues instead of withOpacity, WidgetState instead of MaterialState, PopScope instead of WillPopScope, NavigationBar instead of BottomNavigationBar). Also use when the user asks "what's new in Flutter X", asks how to fix deprecated Flutter widgets, needs Material 3 migration help, or requires assistance rescuing legacy Flutter applications.