fix: use fresh context for state

[YoussefRaafatNasry]

The following pattern was used in a lot of Widgets, which caused the UI to not reflect the actual WidgetbookState, because the SomeWidget will now have outdated values of state on some rebuilds.

// Before
@override
Widget build(BuildContext context) {
  final state = WidgetbookState.of(context);
  
  return SomeWidget(
    child: state.someValue,
  );
}

// After
@override
Widget build(BuildContext context) {  
  return SomeWidget(
    builder: (context) => WidgetbookState.of(context).someValue,
  );
}

[docs-page]

To view this pull requests documentation preview, visit the following URL:

docs.widgetbook.io/~751

Documentation is deployed and generated using docs.page.

[github-actions]

📦 Build

• 🔗 Widgetbook Cloud - Build

📑 Review

• 🔗 Widgetbook Cloud - Review

[github-actions]

📦 Build

• 🔗 Widgetbook Cloud - Build

📑 Review

• 🔗 Widgetbook Cloud - Review