Follow-up to #14012.
Once live preview conditions have passed, it is jarring for the live
preview window to suddenly appear. It should be that, despite
preferences, if the live preview window did not _load_ active, then it
should not become active until the user explicitly toggles it on.
This is especially poor UX while creating a new doc. If the conditional
URL is based on a field that has't been filled yet, upon filling that
field (with autosave), live preview suddenly appears and the entire page
shifts mid-edit.
Before:
https://github.com/user-attachments/assets/0da75306-eed3-4a77-bc58-d8a8dd0254bf
After:
https://github.com/user-attachments/assets/c7918601-959d-4ac5-b168-066afc3d879d
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ca3f054041