refactor(uikit/biz): replace HoverCard with Tooltip in CodeBlock

[Yuiham]

Summary

This PR replaces HoverCard with Tooltip in the CodeBlock component to improve accessibility and UI consistency. The change simplifies the component structure while maintaining the same user experience.

Changes

• Replaced HoverCard with Tooltip for the expand/collapse button in CodeBlock
• Replaced HoverCard with Tooltip for the copy button in CodeBlock
• Updated icon import from IconCopy01 to IconCopy03 for better visual consistency
• Simplified component structure by removing nested HoverCard.Target and HoverCard.Dropdown wrappers
• Updated pnpm to version 10.19.0 and refreshed lock file

Benefits

• Better accessibility: Tooltip provides more native and accessible hover interactions
• Simpler code: Reduced component nesting and cleaner markup
• UI consistency: Aligns with other tooltip usage across the UI kit
• Improved UX: More responsive and lightweight hover interactions

Testing

• Verified expand/collapse functionality works correctly
• Verified copy button shows appropriate tooltip states (Copy/Copied)
• Confirmed tooltip positioning and arrow display

[changeset-bot]

🦋 Changeset detected

Latest commit: 9d184a6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@tidbcloud/uikit	Patch
@tidbcloud/uikit-documentation	Patch
@tidbcloud/uikit-example-with-nextjs-pages-router	Patch
@tidbcloud/uikit-example-with-vitejs	Patch

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