feat: optmize file search list UI

[life2015]

Types

优化了 ListDir 和 文件搜索相关的 UI 和 相关的代码逻辑。

• 🎉 New Features
• 🐛 Bug Fixes
• 📚 Documentation Changes
• 💄 Code Style Changes
• 💄 Style Changes
• 🪚 Refactors
• 🚀 Performance Improvements
• 🏗️ Build System
• ⏱ Tests
• 🧹 Chores
• Other Changes

Background or solution

Changelog

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Project coverage is 53.37%. Comparing base (820dc75) to head (84cf71c).
Report is 1 commits behind head on v3.8.

Files with missing lines	Patch %	Lines
...ackages/ai-native/src/browser/mcp/tools/listDir.ts	0.00%	15 Missing ⚠️
...ages/ai-native/src/browser/mcp/tools/fileSearch.ts	0.00%	3 Missing ⚠️
...ages/ai-native/src/browser/mcp/tools/grepSearch.ts	0.00%	3 Missing ⚠️
...i-native/src/browser/mcp/tools/handlers/ListDir.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             v3.8    #4431      +/-   ##
==========================================
- Coverage   53.38%   53.37%   -0.02%     
==========================================
  Files        1657     1657              
  Lines      102198   102215      +17     
  Branches    22114    22116       +2     
==========================================
- Hits        54563    54559       -4     
- Misses      39627    39647      +20     
- Partials     8008     8009       +1     

Flag	Coverage Δ
jsdom	48.89% <0.00%> (-0.02%)	⬇️
node	12.18% <0.00%> (-0.01%)	⬇️

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[ensorrow]

LGTM