fix: use correct Directus preset parameter for asset transforms

Changed ?transform= to ?key= so Directus storage asset presets
(mini, thumbnail, preview, medium, banner) are actually applied.
Previously all images were served at full resolution.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/frontend/src/lib/directus.ts

@@ -21,7 +21,7 @@ export const getAssetUrl = (
 	if (!id) {
 		return null;
 	}
-	return `${directusApiUrl}/assets/${id}${transform ? "?transform=" + transform : ""}`;
+	return `${directusApiUrl}/assets/${id}${transform ? "?key=" + transform : ""}`;
 };
 
 export const isModel = (user: CurrentUser) => {