Fix Media Library: use data.data.items || data.items

The media list API returns { data: { items: [...] } } wrapped format.
Previously only checked data.items which would be undefined.

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

packages/core/src/visual-editing/toolbar.ts

@@ -1072,7 +1072,7 @@ export function renderToolbar(config: ToolbarConfig): string {
     })
     .then(function(data) {
       console.log("[emdash] Media fetch data:", JSON.stringify(data));
-      var items = data.items || [];
+      var items = (data.data && data.data.items) || data.items || [];
       console.log("[emdash] Items count:", items.length);
       var loadingEl = browser.querySelector(".emdash-img-loading");
       if (loadingEl) loadingEl.remove();