feat: Move conditional rendering inside svg to prevent layout shift

[trillium]

While the ThemeSwitch mounts there's a potential for the buttons to be shifted to the left if it loads in slowly.

Moving the conditional rendering inside the <svg/> keeps the spacing open for the button to load in properly.

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Name	Status	Preview	Comments	Updated (UTC)
tailwind-nextjs-starter-blog	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 31, 2024 2:42pm

[timlrx]

Thanks for the fix!