feat: rich text editor, image crop component, empty DB resilience

- RichTextarea with toolbar (Bold, Italic, List, Heading) + Ctrl+B/I
  hotkeys (layout-independent), active state highlighting, preview mode
- Shared ImageCropField component (replaces duplicate in news/classes)
  with drag-to-reposition, Ctrl+scroll zoom, compact layout
- SectionEditor defaultData prop — all admin pages handle empty DB
- Team: section title editable, toast notifications, unsaved data warning
  on navigation (back button, sidebar links, browser close)
- Carousel: continuous card wrapping during drag, edge fade for small teams
- Markup renderer: **bold**, *italic*, ## headings, 🤍 bullet points
- Empty DB guards on all public site sections
- Fix: upload error handling, contact phone field, "team" section key

src/components/sections/Pricing.tsx

@@ -13,6 +13,7 @@ interface PricingProps {
 }
 
 export function Pricing({ data: pricing }: PricingProps) {
+  if (!pricing?.items) return null;
   const [activeTab, setActiveTab] = useState<Tab>("prices");
   const tabRefs = useRef<(HTMLButtonElement | null)[]>([]);
   const tabs: { id: Tab; label: string; icon: React.ReactNode }[] = [