Enhance public access and error handling in site-related views and loaders

- Updated `DebugScopedRateThrottle` to allow public access for blueprint list requests with site filters.
- Modified `SiteViewSet` and `SiteBlueprintViewSet` to permit public read access for list requests.
- Enhanced `loadSiteDefinition` to resolve site slugs to IDs, improving the loading process for site definitions.
- Improved error handling in `SiteDefinitionView` and `loadSiteDefinition` for better user feedback.
- Adjusted CSS styles for better layout and alignment in shared components.

backend/igny8_core/business/site_building/models.py

@@ -101,6 +101,7 @@ class PageBlueprint(SiteSectorBaseModel):
         ('draft', 'Draft'),
         ('generating', 'Generating'),
         ('ready', 'Ready'),
+        ('published', 'Published'),
     ]
     
     site_blueprint = models.ForeignKey(