refactor: move cardlayer to just load store

src/components/utils/csv-loader.ts

@@ -91,7 +91,7 @@ export function processVariables<T extends JSONObject> (body: string, currentRow
     const frontMatter = csv.frontmatter;
     if(key in row) return row[key];
     if(frontMatter && key in frontMatter) return frontMatter[key];
-    return '';
+    return `{{${key}}}`;
   }
 
   return body.replace(/\{\{(\w+)\}\}/g, (_, key) => `${replaceProp(key)}`);