Reorganize the home plugin's new frontend system extensions to follow
the same pattern as the catalog plugin's EntityContentLayoutBlueprint.
Key changes:
- Widgets now attach directly to page:home instead of through an
intermediate HomepageBlueprint extension
- Add HomePageLayoutBlueprint in home-react for custom layout creation,
with a built-in default layout as fallback
- Remove compatWrapper from HomepageWidgetBlueprint (consumer
responsibility, reduced need with NFS support in old system)
- Remove HomepageCompositionRoot usage (old system artifact)
- Delete HomepageBlueprint (replaced by HomePageLayoutBlueprint)
- Update app-next example and dev harness to use new pattern
Signed-off-by: Adam Kunicki <kunickiaj@gmail.com>
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