- Added a new module for editor UI widgets, including ScrollViewBuilder, CoreScrollArea, ExpansionButton, BasicPanel, and ScrollableContainer.
- Implemented basic theme support with EditorTheme struct.
- Created a Panel widget with collapsible and resizable features.
- Developed a scrollable area widget with mouse wheel support and content height calculation methods.
- Added examples for using scroll widgets and programmatic scrolling.
- Introduced a simple panel widget with configurable dimensions and styling.
- Implemented a simple scrollable container with mouse wheel support.
- Established a theming system compatible with bevy_feathers, including themed UI elements and a theme management plugin.
