fix: update default userName from 'Roberto' to 'there' in store and AIChatPanel

src/main/store.ts

@@ -16,7 +16,7 @@ export function getStore(): Store<AppSettings> {
         sidebarCollapsed: false,
         aiProvider: 'copilot',
         encryptedTokens: {},
-        userName: 'Roberto',
+        userName: 'there',
       },
     });
   }