fix: remove Babel build warning in seo checks

[immanuwell]

Tiny cleanup but it hits every build, kinda noisy.

On main, npm run build prints the DefaultCheckOptions Babel scope tracker warning twice from the local seo checks package.
This swaps type-only imports to import type, so Babel stops treating that type like runtime code. Build output is clean again.

Repro

1. npm ci
2. npm run build
3. See the DefaultCheckOptions warning twice

Checks

1. Reverted this patch locally and reproduced the warning
2. Re-applied it and ran npm run build again
3. Warning is gone, build still passes

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