feat: add vanilla HTML copy support for patterns

[Lahnshen]

Summary

Adds support for copying patterns as vanilla HTML in addition to React code.

Changes

• Updated useCopy hook to generate vanilla HTML from pattern styles.
  • The hook now takes the entire pattern object instead of just pattern.code in the pattern parameter.
  • The hook now has a boolean vanilla parameter which specifies whether it should copy the pattern.code or convert pattern.style to a vanilla div element and copy that instead.
• Added separate "React" and "Vanilla" copy buttons in pattern card components.

How it works

The vanilla output applies all pattern.style properties to a child div similar to how the pattern card component does (pattern-card.tsx:87) and copies that to the clipboard of the user.

[vercel]

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