fix: float button render hover color correctly

[LonelySnowman]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
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• Other (about what?)

🔗 Related issue link

• close bug: FloatButton with tooltip #48197

💡 Background and solution

Modify css weight to render correctly

📝 Changelog

Language	Changelog
🇺🇸 English	Fix tooltip FloatButton hover background color error issue
🇨🇳 Chinese	修复 tooltip FloatButton hover 背景色错误问题

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[github-actions]

👁 Visual Regression Report for PR #48198 Passed ✅

🎯 Target branch: master (287dd69)
📖 View Full Report ↗︎

🎊 Congrats! No visual-regression diff found.

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