chore: remove useless code

[zombieJ]

FF 已经没有这个问题了，可以去掉了。

Summary by CodeRabbit

• 修复
  • 移除了对 Firefox 特定滚动跳转问题的兼容处理，提升了兼容性体验。

[coderabbitai]

Walkthrough

本次变更主要对 ResizableTextArea.tsx 文件进行了类型安全性增强和代码清理。具体包括：使用 as const 优化了常量声明，引入了新的联合类型 ResizeState，并将 React 状态钩子类型更新为该类型。同时，移除了已无用的 Firefox 特定兼容性修复函数及相关调用。

Changes

Cohort / File(s)	Change Summary
类型声明与状态管理优化 src/ResizableTextArea.tsx	常量使用 as const，新增 ResizeState 联合类型，并将 resizeState 状态声明类型化为 ResizeState。
Firefox 兼容性代码移除 src/ResizableTextArea.tsx	移除了 fixFirefoxAutoScroll 函数及其调用，相关位置添加注释说明该问题已被 Firefox 官方修复。

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

一只兔子跳进代码田，
类型更严谨，常量更鲜明。
Firefox 的补丁说再见，
只留清爽与注释相伴。
代码如春风，
跳跃在每一行，
兔子微笑着继续前行。 🐇

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between c6bee0d and d7417eb.

📒 Files selected for processing (1)

• src/ResizableTextArea.tsx (3 hunks)

🔇 Additional comments (3)

src/ResizableTextArea.tsx (3)

11-18: 类型安全性改进很好！

使用 as const 断言和联合类型 ResizeState 是很好的 TypeScript 实践，提供了更严格的类型检查，避免了类型扩展问题。

---

71-72: 状态类型标注正确！

正确使用新定义的 ResizeState 类型来标注状态钩子，确保了类型一致性和安全性。

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116-118: 确认无遗留依赖，安全移除 Firefox 兼容代码

已在整个代码库中搜索 fixFirefoxAutoScroll 及 “firefox…scroll” 相关关键字，未发现任何引用。确认移除 Firefox 特定兼容函数不会影响现有功能，可以合并。

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.00%. Comparing base (c6bee0d) to head (d7417eb).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   97.60%   99.00%   +1.39%     
==========================================
  Files           3        3              
  Lines         209      201       -8     
  Branches       64       63       -1     
==========================================
- Hits          204      199       -5     
+ Misses          5        2       -3     

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