The content column's edges were drawn only by the page builder, and they answer a question the Layout
section has just as much: the page is held to max-w-7xl and centred, so on a wide screen the content
stops well short of the window and nothing marks where.
`paintMeasure` is its own function now, called by both. The builder also draws sections, columns and a
drop zone; none of those belong in Layout, whose bands are code and cannot be rearranged from there.
What the two share is exactly the measure and nothing else.
Nothing in View, for the same reason as the builder: chrome of any kind means you are not looking at
the page.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
pastilhasandClaude Opus 5
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