fix(core): ai history of new users is always loading, enable online search by default (#11741)

Close [AI-69](https://linear.app/affine-design/issue/AI-69).

tests/affine-cloud-copilot/e2e/basic/authority.spec.ts

@@ -9,6 +9,12 @@ test.describe('AIBasic/Authority', () => {
     await utils.chatPanel.openChatPanel(page);
   });
 
+  test('should show messages placeholder when no login', async ({ page }) => {
+    await expect(
+      page.getByTestId('chat-panel-messages-placeholder')
+    ).toBeVisible();
+  });
+
   test('should show error & login button when no login', async ({
     page,
     utils,

tests/affine-cloud-copilot/e2e/utils/chat-panel-utils.ts

@@ -33,6 +33,9 @@ export class ChatPanelUtils {
     }
     await page.getByTestId('sidebar-tab-chat').click();
     await expect(page.getByTestId('sidebar-tab-content-chat')).toBeVisible();
+    // TODO: remove this
+    // after network search is disabled by default
+    await this.disableNetworkSearch(page);
   }
 
   public static async typeChat(page: Page, content: string) {
@@ -48,7 +51,6 @@ export class ChatPanelUtils {
   }
 
   public static async makeChat(page: Page, content: string) {
-    await this.openChatPanel(page);
     await this.typeChat(page, content);
     await page.keyboard.press('Enter');
   }