feat: Group presets by component category #3534217
This MR improves the organization of the Presets Panel by grouping SDC presets according to their component category.
Changes
- ApiController determines a preset's group from the component definition.
- PresetLibraryPanel sorts presets by group id.
- Presets without a group fall under a default "Other" group.
Testing instructions
- Enable Display Builder.
- Save presets with different component categories - for example at admin/structure/page-layout/my_page_layout/builder
- Verify they appear grouped by category in the Presets Panel.