fix: 表头吸顶主题同步

[Alexzjt]

👀 PR includes

🐛 Bugfix

• Solve the issue and close 🐛表格吸顶 #3350

🔧 Chore

• Test case
• Docs / demos update
• CI / workflow
• Release version
• Other ()

📝 Description

🖼️ Screenshot

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[gemini-code-assist]

Code Review

This pull request introduces a syncTheme method in StickyHeaderController to synchronize the main table's theme to the sticky header instance (stickyS2). The review feedback points out that calling setThemeCfg triggers expensive internal computations that are immediately overwritten by the direct assignment of theme on the next line, and suggests directly assigning themeName and theme instead to avoid this overhead.

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[github-actions]

Size Change: +39 B (+0.01%)

Total Size: 745 kB

📦 View Changed

Filename	Size	Change
packages/s2-core/dist/s2.min.js	312 kB	+39 B (+0.01%)

ℹ️ View Unchanged

Filename	Size
packages/s2-core/dist/s2-extends.min.js	209 kB
packages/s2-core/dist/s2.min.css	581 B
packages/s2-react-components/dist/s2-react-components.min.css	2.55 kB
packages/s2-react-components/dist/s2-react-components.min.js	123 kB
packages/s2-react/dist/s2-react.min.css	1.3 kB
packages/s2-react/dist/s2-react.min.js	38.5 kB
packages/s2-vue/dist/s2-vue.min.css	3.8 kB
packages/s2-vue/dist/s2-vue.min.js	54.2 kB

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[github-actions]

🎉 This PR is included in version @antv/s2-v2.7.2-alpha.1 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

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