[Bug] When you open two web pages for comparison, only one frame can be selected.

[zhanghengxin]

Describe the bug

A clear and concise description of what the bug is.

Steps to reproduce the behavior

open they:
https://storybook.js.org/docs/get-started/web-components-vite
https://storybook.js.org/docs/get-started/vue3-vite

I cant comparing.

Expected behavior

A clear and concise description of what you expected to happen.

Screenshots and/or logs

If applicable, add screenshots and/or logs to help explain your problem.

Environment

• OS: [e.g. iOS]
• Node.js version: [e.g. v12.17.0]
• NPM version: [e.g. 6.14.4]
• Browser (if applicable): [e.g. chrome, safari]
• Browser version (if applicable): [e.g. 22]
• Device (if applicable): [e.g. iPhone6]

Additional context

Add any other context about the problem here.

Move the sb-docs-selected-framework to sessionStorage.