Enhance moderation dashboard UI and UX:

- Add HTMX-powered filtering with instant updates
- Add smooth transitions and loading states
- Improve visual hierarchy and styling
- Add review notes functionality
- Add confirmation dialogs for actions
- Make navigation sticky
- Add hover effects and visual feedback
- Improve dark mode support

companies/models.py

@@ -88,3 +88,43 @@ class Manufacturer(models.Model):
                 return cls.objects.get(pk=historical.object_id), True
             except (HistoricalSlug.DoesNotExist, cls.DoesNotExist):
                 raise cls.DoesNotExist()
+
+class Designer(models.Model):
+    name = models.CharField(max_length=255)
+    slug = models.SlugField(max_length=255, unique=True)
+    website = models.URLField(blank=True)
+    description = models.TextField(blank=True)
+    total_rides = models.IntegerField(default=0)
+    total_roller_coasters = models.IntegerField(default=0)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    objects: ClassVar[models.Manager['Designer']]
+
+    class Meta:
+        ordering = ['name']
+
+    def __str__(self) -> str:
+        return self.name
+
+    def save(self, *args, **kwargs) -> None:
+        if not self.slug:
+            self.slug = slugify(self.name)
+        super().save(*args, **kwargs)
+
+    @classmethod
+    def get_by_slug(cls, slug: str) -> Tuple['Designer', bool]:
+        """Get designer by slug, checking historical slugs if needed"""
+        try:
+            return cls.objects.get(slug=slug), False
+        except cls.DoesNotExist:
+            # Check historical slugs
+            from history_tracking.models import HistoricalSlug
+            try:
+                historical = HistoricalSlug.objects.get(
+                    content_type__model='designer',
+                    slug=slug
+                )
+                return cls.objects.get(pk=historical.object_id), True
+            except (HistoricalSlug.DoesNotExist, cls.DoesNotExist):
+                raise cls.DoesNotExist()