Style and theme FmgLib.MauiMarkup apps — Style<T> with typed setters, resource dictionaries, BasedOn, visual states with VisualStates constants, property/data/multi/event triggers, light-dark AppThemeBinding, DynamicResource theme switching, gradients, shadows and Animate…To animations. Use when building a design system, adding dark mode, defining app-wide styles, adding hover/press/disabled states, or animating a control in a C# markup MAUI app.