fix: Select empty style & default width

[zombieJ]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

fix #20146
fix #19889

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Select provides default width and not show dropdown when notFoundContent is null.
🇨🇳 Chinese

☑️ Self Check before Merge

• 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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[codecov]

Codecov Report

Merging #20232 into 4.0-prepare will increase coverage by <.01%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           4.0-prepare   #20232      +/-   ##
===============================================
+ Coverage        97.55%   97.56%   +<.01%     
===============================================
  Files              294      295       +1     
  Lines             6839     6849      +10     
  Branches          1839     1879      +40     
===============================================
+ Hits              6672     6682      +10     
  Misses             167      167

Impacted Files	Coverage Δ
components/skeleton/Skeleton.tsx	100% <ø> (ø)	⬆️
components/skeleton/index.tsx	100% <100%> (ø)	⬆️
components/skeleton/Input.tsx	100% <100%> (ø)
components/alert/ErrorBoundary.tsx	100% <100%> (ø)	⬆️

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[shaodahong]

Missing cursor

[zombieJ]

@shaodahong , pls help to check again.

[shaodahong]

Arrow top height not correct

[shaodahong]

Empty Option when hidden
（隐藏的时候出现了空 Option）

[shaodahong]

Group indent is missing

[shaodahong]

Missing input hover bordered

[zombieJ]

Empty Option when hidden
（隐藏的时候出现了空 Option）

这个开个新的 issue，样式的先合了。

[shaodahong]

嗯，我提的有些和 #20229 重复了，可以一起过一下

[zombieJ]

嗯，分几个 PR 逐步更新。免得太大合不掉了。

[shaodahong]

LGTM