feat: Follow navigation in preview view

[distantnative]

Description

Feature for the new Panel preview view that allows users to navigate in the frontend iframe and the Panel following their navigation (syncing to the newly page they navigated to):

Screen.Recording.2025-08-16.at.14.13.40.mp4

Merge first

• feat: Query::merge() + Params::merge() #7546

Changelog

🎉 Features

• Preview view: When you navigate through your frontend, the Panel syncs to the new location

For review team

• Add changes & docs to release notes draft in Notion

[bastianallgeier]

There are two things that I found when testing it with the demokit.

1. When you click on a link that has target _blank, the onClick handler would still try to open a new window for it and Firefox supresses that with a warning. I think we should check what the target for the link is.

2. When I click on one of the "View source" links in the footer, the link is internal, but there's no matching model and a warning will pop up. Could we check for that error and still open the link in a new window?