add_to_cart_animated_button

• Breaking: onIncrement and onDecrement are now FutureOr<void> Function() instead of Function(int). Callers must read the new value from their own state/controller instead of receiving it as a callback argument. Existing synchronous callbacks keep working unchanged.
• Fix: AddToCart now enforces maxValue/minValue itself — the increment/decrement buttons no longer fire past those bounds (previously only the icon opacity dimmed; the tap still fired).
• Behavior change: tapping a control at its bound now fires the new onMaxValueReached/onMinValueReached callback instead of doing nothing — the real onIncrement/onDecrement still never fires past the bound.
• Added built-in async/loading support: if onIncrement/onDecrement returns a Future, the widget awaits it, shows loadingIndicator while pending, and blocks further taps until it resolves.
• Added AddToCart.controller constructor and AddToCartController (a ValueNotifier<int>) for imperative/external control (e.g. resetting the count from a parent widget) as an alternative to the caller-managed value prop.
• Added AddToCartThemeData as a ThemeExtension so colors/decorations/icons/text style can be set once via ThemeData.extensions instead of per-instance; explicit constructor params still take precedence.
• Added accessibility: Semantics labels on all controls, configurable via incrementSemanticLabel, decrementSemanticLabel, addSemanticLabel, and counterSemanticLabelBuilder.
• Added enabled and errorText params for disabled/read-only/error states.
• Added enableLongPressRepeat (+ longPressRepeatInterval) to auto-repeat increment/decrement on long-press.
• Fixed the increment/decrement slide animation to respect Directionality (previously always slid left-to-right regardless of locale).
• Added debugFillProperties override on AddToCart (exposes value, minValue, maxValue, enabled, and whether a controller is attached, in Flutter Inspector/DevTools).
• Updated example app's Android build tooling: Gradle 8.3 → 8.9, Android Gradle Plugin 8.1.0 → 8.7.0, Kotlin 1.8.22 → 2.1.0.
• Verified compatibility with Flutter 3.41.6 / Dart 3.11.4.

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Initial Version