Hidden tabs' contetnt flash in FF 137

[BANOnotIT]

📝 Issue Description

On page navigation, <Sidebar> flashes with all tabs

📋 On which page(s) it occurs

https://docs.astro.build/en/basics/astro-pages/ ... practically all pages without splash layout

🤔 Expected Behavior

Non-active tabs should hide content and only show it when tab is clicked

👀 Current Behavior

https://github.com/user-attachments/assets/a188120b-670a-4bf6-b9e8-97e01615f572

🖥️ Browser

Firefox 137

📄 Additional Information

https://github.com/withastro/docs/blob/0b53033482167b75e1503252242084f4df5e213d/src/components/tabs/TabPanel.astro#L27-L40