fix: split view focus (#11217)

# After:

https://github.com/user-attachments/assets/990d500d-2da7-488e-ac32-dd7bd229f896

# Before:

https://github.com/user-attachments/assets/6676766a-c76a-414b-a35e-53d2cda10c24

tests/blocksuite/e2e/link.spec.ts

@@ -288,6 +288,7 @@ test('link bar should not be appear when the range is collapsed', async ({
   await pressCreateLinkShortCut(page);
   await expect(linkPopoverLocator).toBeVisible();
 
+  await focusRichText(page); // click to cancel the link popover
   await focusRichTextEnd(page);
   await pressEnter(page);
   // create auto line-break in span element