Implement Platform Superuser UI and Fix API Role Casing

- Update API to return lowercase roles for frontend compatibility
- Fix Tenant owner lookup in platform admin serializer
- Update frontend App.tsx to match tarball implementation
- Prioritize vite.config.js for HMR support
- Include pending CSP and CORS configuration updates

smoothschedule/platform_admin/serializers.py

@@ -43,7 +43,7 @@ class TenantSerializer(serializers.ModelSerializer):
         try:
             owner = User.objects.filter(
                 role=User.Role.TENANT_OWNER,
-                # Note: We need to add a tenant reference to User model
+                tenant=obj
             ).first()
 
             if owner:
@@ -52,7 +52,7 @@ class TenantSerializer(serializers.ModelSerializer):
                     'username': owner.username,
                     'full_name': owner.full_name,
                     'email': owner.email,
-                    'role': owner.role,
+                    'role': owner.role.lower(),
                 }
         except:
             pass
@@ -65,6 +65,7 @@ class PlatformUserSerializer(serializers.ModelSerializer):
     business_name = serializers.SerializerMethodField()
     business_subdomain = serializers.SerializerMethodField()
     full_name = serializers.SerializerMethodField()
+    role = serializers.SerializerMethodField()
 
     class Meta:
         model = User
@@ -76,6 +77,9 @@ class PlatformUserSerializer(serializers.ModelSerializer):
         ]
         read_only_fields = fields
 
+    def get_role(self, obj):
+        return obj.role.lower()
+
     def get_full_name(self, obj):
         """Get user's full name"""
         return obj.full_name