fix(build): add iframe support to rehype base path plugin

Allows iframe src attributes to be properly transformed with the base path,
enabling the interactive workflow diagram to be embedded in markdown pages.

website/src/rehype-base-paths.js

@@ -39,6 +39,18 @@ export default function rehypeBasePaths(options = {}) {
         }
       }
 
+      // Process iframe tags with src attribute
+      if (node.tagName === 'iframe' && node.properties?.src) {
+        const src = node.properties.src;
+
+        if (typeof src === 'string' && src.startsWith('/') && !src.startsWith('//')) {
+          // Don't transform if already has the base path
+          if (normalizedBase !== '/' && !src.startsWith(normalizedBase)) {
+            node.properties.src = normalizedBase + src.slice(1);
+          }
+        }
+      }
+
       // Process anchor tags with href attribute
       if (node.tagName === 'a' && node.properties?.href) {
         const href = node.properties.href;