fix(frontend/builder): make Select widget full-width in list[enum] fields

The Select atom's wrapper div lacked w-full, causing select dropdowns
inside array items (list[enum] fields) to not fill the available width.

Resolves SECRT-2165

autogpt_platform/frontend/src/components/atoms/Select/Select.tsx

@@ -119,7 +119,7 @@ export function Select({
   );
 
   const selectWithError = (
-    <div className={cn("relative mb-6", wrapperClassName)}>
+    <div className={cn("relative mb-6 w-full", wrapperClassName)}>
       {select}
       <Text
         variant="small-medium"