fix(design-system): @import rules order should be correct

[dengfuping]

I have read the CONTRIBUTING.md file.

YES

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

• @import rules must precede all rules aside from @charset and @layer statements.
• apps/design-system local dev error:

What is the new behavior?

apps/design-system local dev should be correct:

Additional context

• None

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Project	Deployment	Preview	Comments	Updated (UTC)
design-system	✅ Ready	Preview	Comment	Aug 15, 2025 0:18am
docs	✅ Ready	Preview	Comment	Aug 15, 2025 0:18am
studio-self-hosted	✅ Ready	Preview	Comment	Aug 15, 2025 0:18am
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Project	Deployment	Preview	Comments	Updated (UTC)
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