Add hover preview cards

Adds hover-preview UX by introducing preview cards for entities and wiring hoverable links:
- Implements CompanyPreviewCard and ParkPreviewCard components plus hooks to fetch preview data
- Adds HoverCard usage to ParkDetail and RideDetail for operator, manufacturer, and designer links
- Creates preview wrappers for manufacturer/designer/operator links and updates related pages to use hover previews
- Includes supporting updates to query keys and preview hooks to fetch minimal data for previews

src/lib/queryKeys.ts

@@ -106,6 +106,11 @@ export const queryKeys = {
     maintenanceTables: () => ['admin', 'maintenance-tables'] as const,
   },
   
+  // Companies queries
+  companies: {
+    detail: (slug: string) => ['companies', 'detail', slug] as const,
+  },
+  
   // Analytics queries
   analytics: {
     all: ['analytics'] as const,