feat(admin): add production error center and refresh CMS dependencies

src/components/admin/rich-text.tsx

@@ -2,10 +2,8 @@
 
 import { useEffect, useId, useRef, useState } from "react";
 
-// TinyMCE community build, loaded from the public jsDelivr CDN. `no-api-key`
-// is the documented sentinel for the free self-hosted/CDN build and silences
-// the "register for an API key" notification.
-const TINYMCE_SRC = "https://cdn.jsdelivr.net/npm/tinymce@6/tinymce.min.js";
+// Editor assets are pinned in the lockfile and copied during build.
+const TINYMCE_SRC = "/vendor/tinymce/tinymce.min.js";
 
 type TinyMCEGlobal = {
 	init: (opts: Record<string, unknown>) => Promise<unknown>;