⚡️ perf: improve stream smoothing

[arvinxx]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 👷 build
• ⚡️ perf
• 📝 docs
• 🔨 chore

🔀 变更说明 | Description of Change

use requestAnimationFrame to replace setTimeout

📝 补充信息 | Additional Information

• ⚡️ perf: improve performance on long context text #3754

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lobe-chat-database	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 3, 2024 7:22pm
lobe-chat-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 3, 2024 7:22pm

[lobehubbot]

👍 @arvinxx

Thank you for raising your pull request and contributing to our Community
Please make sure you have followed our contributing guidelines. We will review it as soon as possible.
If you encounter any problems, please feel free to connect with us.
非常感谢您提出拉取请求并为我们的社区做出贡献，请确保您已经遵循了我们的贡献指南，我们会尽快审查它。
如果您遇到任何问题，请随时与我们联系。

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.

Project coverage is 91.74%. Comparing base (51c6b62) to head (9f8ffaf).
Report is 489 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils/fetch/fetchSSE.ts	81.81%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3758      +/-   ##
==========================================
- Coverage   91.75%   91.74%   -0.01%     
==========================================
  Files         453      453              
  Lines       30056    30055       -1     
  Branches     2076     2915     +839     
==========================================
- Hits        27577    27574       -3     
- Misses       2479     2481       +2     

Flag	Coverage Δ
app	91.74% <81.81%> (-0.01%)	⬇️
server	97.36% <ø> (ø)

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[lobehubbot]

❤️ Great PR @arvinxx ❤️

The growth of project is inseparable from user feedback and contribution, thanks for your contribution! If you are interesting with the lobehub developer community, please join our discord and then dm @arvinxx or @canisminor1990. They will invite you to our private developer channel. We are talking about the lobe-chat development or sharing ai newsletter around the world.
项目的成长离不开用户反馈和贡献，感谢您的贡献! 如果您对 LobeHub 开发者社区感兴趣，请加入我们的 discord，然后私信 @arvinxx 或 @canisminor1990。他们会邀请您加入我们的私密开发者频道。我们将会讨论关于 Lobe Chat 的开发，分享和讨论全球范围内的 AI 消息。

[lobehubbot]

🎉 This PR is included in version 1.15.11 🎉

The release is available on:

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

Your semantic-release bot 📦🚀