feat(generator): post data to parent preset form

app/static/js/app.jsx

@@ -5488,6 +5488,30 @@ const AIPresetModal = ({ isOpen, onClose }) => {
       .finally(function() { setSyncing(false); });
   }, []);
 
+  // Listen for GENERATOR_PRESET_DATA from the iframe generator modal
+  React.useEffect(() => {
+    const handleMessage = (event) => {
+      if (event.data && event.data.type === 'GENERATOR_PRESET_DATA') {
+        const d = event.data;
+        setFormName(d.name || '');
+        setFormCategory(d.category || 'Orchestral / Film Score');
+        setSelectedCategory(d.category || 'Orchestral / Film Score');
+        setFormKeywords(d.keywords || '');
+        setFormBars(parseInt(d.default_bars) || 8);
+        setFormBpm(parseInt(d.default_bpm) || 120);
+        setFormScale(d.default_scale || 'C Minor');
+        setFormTemplate(d.template || '');
+        setEditingPreset('new');
+        setShowGeneratorModal(false);
+        setIsAddingCategory(false);
+        setNewCategoryValue('');
+        refreshPresets();
+      }
+    };
+    window.addEventListener('message', handleMessage);
+    return () => window.removeEventListener('message', handleMessage);
+  }, []);
+
   const savePresets = (newPresets) => {
     setPresets(newPresets);
     mgr.presets = newPresets;