Add/Remove Page Breaks (to match Add/Remove System Breaks)

Your idea

Add a command like the existing "Add/Remove System Breaks" but for Page Breaks.

Problem to be solved

Once you have your layout the way you want it in terms of page breaks etc., having the ability to fix them in place so that further edits don't cause systems to move around between pages would be super helpful. Also in some cases you really do want a fixed number of systems per page.

Prior art

No response

Additional context

Could potentially expand existing command, but I think it's sufficiently independent to justify a separate one. Obviously when page breaks are added, any existing system breaks could be removed, but possibly shouldn't be just in case you later decide you want more systems per page but to keep the existing system breaks.

Checklist

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