Ionic Theme iOS 26 v3.0.0

This release improves structured inset lists, floating action button positioning, Ionic 9 compatibility coverage, and public documentation.

Breaking change

The section-header class for ion-item-group has been renamed:

- <ion-item-group class="header-item-group">
+ <ion-item-group class="item-group-header">

The old class is no longer styled. Update shared markup used with @rdlabo/ionic-theme-md3 at the same time.

Added structured two-line inset items using direct, unslotted ion-label and ion-note children.
Improved inset-list markup compatibility with the MD3 theme so both modes can share one template.
Corrected floating action button positioning alongside side menus and aligned expanded FAB lists.
Added tested demo and screenshot coverage for Ionic 8 and Ionic 9.
Added complete dual-theme setup guidance, including Sass import order, dark mode, and platform-specific transitions.
Reorganized the public documentation around installation, features, special markup, migration, and experimental animations.

Requires @ionic/core >=8.8.1 <10.
Applications using @ionic/core <8.8.1 should remain on @rdlabo/ionic-theme-ios26@2.2.1 or upgrade Ionic.