[BUG] fix: remove duplicate React imports in ThemeToggle

[ask-z4ch]

Description

src/components/ThemeToggle.tsx imports useEffect and useState from "react" on both line 3 and line 5, causing a compilation error:

Steps to Reproduce

1. Run bun run build
2. Build fails with duplicate identifier error

Fix

Remove the duplicate import on line 5 (or line 3).

Additional Context

Discovered while working on issue #1227.

[github-actions]

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Architecture notes

Reframe is a static Next.js app with output: "export". Key points:

• All video processing uses FFmpeg.wasm (client-side, no server)
• headers() in next.config.ts won't work — use vercel.json instead
• not-found.tsx requires public/404.html + vercel.json routes config

Happy contributing! ⭐ Star the repo if you find it useful!

[ask-z4ch]

/assign

Hi @magic-peach, I'd like to work on this — contributing under GSSoC'26.
To resolve this, I plan to:

• Remove the duplicate useEffect and useState import on line 5 of src/components/ThemeToggle.tsx.
• Modify src/components/ThemeToggle.tsx to keep only the single import on line 3.
• Ensure the code matches the project's formatting and styling rules without adding redundant imports.
• Verify the fix passes bun run build with zero errors.

I will have a clean pull request raised within 24 to 48 hours!

[github-actions]

Hey @ask-z4ch, this issue has been assigned to you! 🎉 Please make progress within 5 days or it will be automatically unassigned due to inactivity.

[github-actions]

Hey @ask-z4ch, just a friendly reminder that this issue has had no activity for 2 days. Please leave an update or let us know if you need help! ⏰

[github-actions]

Hey @ask-z4ch, final warning! ⚠️ This issue has had no activity for 4 days and will be automatically unassigned in 24 hours if there is no update.

[ask-z4ch]

@magic-peach I've linked a pull request, kindly review

[ask-z4ch]

I submitted this fix in PR #1236 (earlier),
but PR #1293 was merged first with the same changes.
The fix is already in upstream -- closing my PR. No further action needed.