fix: add missing isHandleDisabled default value in context

React.createContext default value was missing isHandleDisabled after
making it required in SliderContextProps

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 刘欢

src/context.ts

@@ -33,6 +33,7 @@ const SliderContext = React.createContext<SliderContextProps>({
   keyboard: true,
   styles: {},
   classNames: {},
+  isHandleDisabled: () => false,
 });
 
 export default SliderContext;