feat: support ai native layout config

[Ricbet]

Types

• 🎉 New Features

Background or solution

ai native 模块新增 useMergeRightWithLeftPanel 和 useMenubarView 配置，可以将 right 面板与 left 面板进行合并，保留一定空间给 chat 面板，默认关闭（可在集成方开启）

默认：

开启后：

Changelog

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 57.12%. Comparing base (426adea) to head (9c19561).

Files	Patch %	Lines
...es/core-browser/src/ai-native/ai-config.service.ts	13.63%	17 Missing and 2 partials ⚠️
packages/menu-bar/src/browser/menu-bar.store.ts	30.00%	7 Missing ⚠️
...ages/ai-native/src/browser/layout/layout-config.ts	0.00%	5 Missing ⚠️
packages/ai-native/src/browser/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3423      +/-   ##
==========================================
- Coverage   57.14%   57.12%   -0.02%     
==========================================
  Files        1441     1441              
  Lines       88874    88903      +29     
  Branches    18310    18315       +5     
==========================================
+ Hits        50784    50788       +4     
- Misses      34655    34679      +24     
- Partials     3435     3436       +1     

Flag	Coverage Δ
jsdom	52.38% <20.00%> (-0.02%)	⬇️
node	15.95% <2.50%> (-0.01%)	⬇️

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