fix: move useMemo above early returns in ModelParametersInner

The displaySchema useMemo was placed after conditional early returns,
violating React's Rules of Hooks and causing hook order mismatch errors
when the component toggled between rendering null and its content.

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

src/components/nodes/ModelParameters.tsx

@@ -211,6 +211,12 @@ function ModelParametersInner({
     };
   }, [useGrid]);
 
+  const displaySchema = useMemo(() => {
+    return useGrid && colCount > 1
+      ? reorderColumnFirst(sortedSchema, colCount)
+      : sortedSchema;
+  }, [sortedSchema, useGrid, colCount]);
+
   // Don't render anything for Gemini or if no model selected
   if (provider === "gemini" || !modelId) {
     return null;
@@ -221,12 +227,6 @@ function ModelParametersInner({
     return null;
   }
 
-  const displaySchema = useMemo(() => {
-    return useGrid && colCount > 1
-      ? reorderColumnFirst(sortedSchema, colCount)
-      : sortedSchema;
-  }, [sortedSchema, useGrid, colCount]);
-
   return (
     <div className="shrink-0">
       {error ? (