[Feature]: obtain the <session> of a pop-up window

### Feature Description

obtain the session of a pop-up window that appears after a click operation, where the window is not opened by an open operation and cannot be retrieved through the table list.

### Use Case

When I performing a click operation on an already opened page, it will pop up a new page. I need to operate on the newly opened page. However, because the session of the new page cannot be obtained, no automation operations can be performed on the pop-up page.

### Proposed Solution

_No response_

### Alternatives Considered

_No response_

Start by tracing the click operation and the session path described in the issue, including how sessions are exposed through the table list. Reproduce a click that opens a popup and inspect the existing browser-automation entry points; no files or tests are named. Done means the popup session can be obtained and used for automation without an open operation.

Written by the indexing model from the issue text.