fix: pass DOM node instead of innerHTML string to Idiomorph.morph

Idiomorph's innerHTML morphStyle expects a node reference, not a raw
HTML string. Passing tmp (the wrapper element) instead of tmp.innerHTML
fixes SVG rendering issues where nodes were being incorrectly diffed.

Author: GeneralJerel

apps/app/src/components/generative-ui/widget-renderer.tsx

@@ -388,7 +388,7 @@ window.addEventListener('message', function(e) {
     // Use idiomorph to diff/patch DOM (preserves existing nodes, no flicker)
     if (window.Idiomorph) {
       try {
-        Idiomorph.morph(content, tmp.innerHTML, {
+        Idiomorph.morph(content, tmp, {
           morphStyle: 'innerHTML',
           callbacks: {
             beforeNodeAdded: function(node) {