feat: use new db site, cache requests to avoid repeated unneeded fetch calls

app/items/page.tsx

@@ -7,6 +7,7 @@ import shared from '../../styles/shared.module.css';
 import styles from '../../styles/Items.module.css';
 
 import { Item, Offering } from './types';
+import { fetchItems, fetchOfferings } from '../../lib/db';
 import ItemGrid from './ItemGrid';
 import OfferingGrid from './OfferingGrid';
 
@@ -23,13 +24,11 @@ export default function ItemsPage() {
     const [randMax, setRandMax] = useState(200);
 
     useEffect(() => {
-        Promise.all([
-            fetch('/data/items.json').then(r => r.json()).catch(() => []),
-            fetch('/data/offerings.json').then(r => r.json()).catch(() => []),
-        ]).then(([i, o]) => {
-            setItems(i);
-            setOfferings(o);
-        });
+        Promise.all([fetchItems(), fetchOfferings()])
+            .then(([i, o]) => {
+                setItems(i);
+                setOfferings(o);
+            });
     }, []);
 
     const handleClearAll = () => {