No save, no request, no reload. The panel sets the CSS custom properties on the frame's own <html> and
the page restyles itself, because those are the variables it already reads.
This is only possible because the frame is SAME ORIGIN — it comes through the platform's dev proxy on
Officer's own host. It is the payoff from dropping this plugin's hand-rolled cross-origin proxy, and
the reason that swap was worth making beyond the bugs it fixed.
`removeProperty` where a value is null, not an empty string. Setting the variable to nothing is not the
same as unsetting it: the page's `var(--site-bg, #fff)` fallback would never come back, so choosing
"default" would fail to restore the default — the one case somebody would test.
Applied on load as well as on change, because a reload replaces the document and the properties go with
it. Keyed on the serialised theme rather than the object, which is a new identity every render — the
same trap that hung this component on "Connecting…", one level down.
The property names mirror themeStyle() in the site's layout.tsx and cannot share code across the two
repositories, so this is a copy that can drift. Said so in the file, with the check: the saved page is
rendered by the site's own function, so if live and post-save disagree, this copy is the wrong one.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
pastilhasandClaude Opus 5
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