chore(ai): Hide copy llm button on mobile (#14388)

<img width="487" height="705" alt="image"
src="https://github.com/user-attachments/assets/5c235834-3d1b-40de-8dc6-b01bac3b7772"
/>
<img width="736" height="694" alt="image"
src="https://github.com/user-attachments/assets/86a33862-665d-4b63-94a9-4ba4b948d65e"
/>

Author: NicoHinderling

src/components/docPage/index.tsx

@@ -84,7 +84,7 @@ export function DocPage({
             </div>
             <div className="overflow-hidden">
               {leafNode && <Breadcrumbs leafNode={leafNode} />}{' '}
-              <div className="float-right mt-4 sm:mt-0">
+              <div className="float-right mt-4 sm:mt-0 hidden sm:block">
                 <CopyMarkdownButton pathname={pathname} />
               </div>
             </div>