fix: Indeterminate & checked style

[zombieJ]

[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
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🔗 Related issue link

fix #43621

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Checkbox both set checked & indeterminate prop will not show as indeterminate style.
🇨🇳 Chinese	修复 Checkbox 同时配置 checked 和 indeterminate 时没有展示为 indeterminate 样式的问题。

☑️ 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

---

🚀 Summary

🤖 Generated by Copilot at d246971

Refactor checkbox component to use design tokens for indeterminate state. This improves the consistency and maintainability of the component's style.

🔍 Walkthrough

🤖 Generated by Copilot at d246971

• Refactor the checkbox component to use design tokens for styling (link, link)
  • Remove the hard-coded background color and border color of the checkbox inner element when the checkbox is in the indeterminate state (link)
  • Add the background color and border color of the checkbox inner element when the checkbox is in the indeterminate state, using the design tokens token.colorBgContainer and token.colorBorder (link)

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size-limit report 📦

Path	Size
./dist/antd.min.js	381.65 KB (-1 B 🔽)
./dist/antd-with-locales.min.js	441.26 KB (-3 B 🔽)

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Jul 18, 2023, 12:00 PM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cf40fb0) 100.00% compared to head (d246971) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #43626   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          657       657           
  Lines        11064     11064           
  Branches      2999      2999           
=========================================
  Hits         11064     11064           

Impacted Files	Coverage Δ
components/checkbox/style/index.ts	100.00% <ø> (ø)

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