docs: Several tutorial pages loading in light mode sometimes instead of (my system preferred) dark mode when performing

[eeminionn]

Summary

Addresses #1111: Several tutorial pages loading in light mode sometimes instead of (my system preferred) dark mode when performing actions

Changed files

• apps/svelte.dev/content/tutorial/04-advanced-sveltekit/04-advanced-routing/04-route-groups/+assets/app-a/src/routes/login/+page.svelte

Validation

• git diff --check: passed

Fixes #1111

[vercel]

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