Fix screenshot message selector (.message not .chat-message)

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

src/composables/useTakeover.ts

@@ -191,7 +191,7 @@ export function useTakeover(wsSend: (msg: any) => void) {
                     text: (a as HTMLElement).innerText?.slice(0, 80),
                 }));
             })(),
-            messages: document.querySelectorAll('.chat-message').length,
+            messages: document.querySelectorAll('.message').length,
         };
     }