Disable light theme on login and device auth pages

[benjaminleonard]

Force dark mode on /login/ and /device/ routes by setting data-theme=dark on before first paint and at runtime. Keeps theme preference unaffected on other pages.

Fixes #3136

[vercel]

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Project	Deployment	Actions	Updated (UTC)
console	Ready	Preview	Mar 19, 2026 6:53pm

[david-crespo]

I’m going to see if there’s a way to do this on the pages in question rather than in the store. But it might introduce a flash or delay, in which case we’re stuck with this version.

[benjaminleonard]

I tried that first — and introduced a .dark override class. But the background and a few other parts are defined at a html level.

Alternatively, we just make the page work in light mode. But the lack of a toggle here might be weird.

[david-crespo]

[david-crespo]

I tried the route handle approach but I realized there's no point because the theme-init logic cannot rely on that because it runs before the router exists. So if we're stuck looking at path prefixes there, we should do by path prefix everywhere. I rewrote the code so it's more obviously identical.