feat: support chat visible preference

[Ricbet]

Types

• 🎉 New Features

Background or solution

新增 ai.native.chat.visible.type 配置项，用于控制 chat 面板默认的展示方式

always 表示总是默认展开，never 表示总是默认收起，default 表示跟随 localstorage 走

Changelog

[railway-app]

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 56.11%. Comparing base (48d0f3f) to head (ea25c52).
Report is 1 commits behind head on main.

Files	Patch %	Lines
packages/core-browser/src/ai-native/command.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3554      +/-   ##
==========================================
+ Coverage   56.10%   56.11%   +0.01%     
==========================================
  Files        1487     1487              
  Lines       90963    90966       +3     
  Branches    18661    18654       -7     
==========================================
+ Hits        51036    51048      +12     
+ Misses      33113    33106       -7     
+ Partials     6814     6812       -2     

Flag	Coverage Δ
jsdom	51.49% <66.66%> (+0.01%)	⬆️
node	15.65% <66.66%> (+<0.01%)	⬆️

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