refactor(Assistants): move add assistant button inside container div

Improve layout structure by moving the button inside the same container as other elements for better visual grouping

src/renderer/src/pages/home/Tabs/components/Assistants.tsx

@@ -130,8 +130,8 @@ const Assistants: FC<AssistantsProps> = ({
               )}
             </TagsContainer>
           ))}
+          {renderAddAssistantButton}
         </div>
-        {renderAddAssistantButton}
       </>
     )
   }