use the server preview from the api in the server route for embeds

src/app/common/embed.ts

@@ -20,6 +20,11 @@ type Embed = {
    * The image to show as the thumbmail.
    */
   image?: string;
+
+  /**
+   * The type of the card.
+   */
+  cardType?: "summary" | "summary_large_image";
 };
 
 /**
@@ -29,13 +34,17 @@ type Embed = {
  * @param embedTitle the title of the embed
  * @param description the description of the embed
  * @param image the image to show as the thumbmail
+ * @param cardType the type of the card
  * @returns the metadata for the embed
  */
-export function generateEmbed({ title, embedTitle, description, image }: Embed): Metadata {
+export function generateEmbed({ title, embedTitle, description, image, cardType }: Embed): Metadata {
   // Fall back to the title
   if (!embedTitle) {
     embedTitle = title;
   }
+  if (!cardType) {
+    cardType = "summary";
+  }
 
   const metadata: Metadata = {
     title: `${title}`,
@@ -44,7 +53,7 @@ export function generateEmbed({ title, embedTitle, description, image }: Embed):
       description: description,
     },
     twitter: {
-      card: "summary",
+      card: cardType,
     },
   };