Add switch-main command and improve pr and cr command workflows.

[domchen]

新增 switch-main 命令，用于将本地未提交的变更转移到更新后的 main 分支并清理已合并分支。

同时优化了 pr 和 cr 命令的工作流程，包括：

• pr 命令支持自动识别新建或追加提交模式
• cr 命令清理逻辑优化，无遗留目录时不打印信息

[Copilot]

Pull request overview

This pull request adds a new switch-main command for managing local changes and branch cleanup, while improving the workflows for pr and cr commands. Additionally, it applies code formatting improvements across multiple C++ filter implementation files.

Changes:

• Added switch-main command to transfer uncommitted local changes to an updated main branch and clean up merged branches
• Enhanced pr command to automatically detect whether to create a new PR or append commits to an existing one
• Optimized cr command cleanup logic to avoid printing messages when no legacy directories exist
• Added Test.md documentation for compilation and testing guidelines
• Applied clang-format code formatting to multiple filter implementation files (line wrapping for 100-character limit)

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.codebuddy/commands/switch-main.md	New command documentation for switching to main branch with stash management and merged branch cleanup
.codebuddy/commands/pr.md	Updated workflow to automatically distinguish between creating new PRs and appending to existing PRs
.codebuddy/commands/cr.md	Minor clarification to skip cleanup output when no legacy directories exist
.codebuddy/rules/Test.md	New documentation for project compilation, testing framework, and screenshot baseline management
src/rendering/filters/utils/Filter3DFactory.h	Code formatting: parameter wrapping for Apply3DEffects function declaration
src/rendering/filters/glow/GlowMergeFilter.h	Code formatting: parameter wrapping for GlowMergeRuntimeFilter constructor
src/rendering/filters/glow/GlowFilter.cpp	Code formatting: parameter and variable initialization wrapping
src/rendering/filters/MosaicFilter.cpp	Code formatting: variable initialization wrapping
src/rendering/filters/HueSaturationFilter.cpp	Code formatting: parameter wrapping for filter creation
src/rendering/filters/DisplacementMapFilter.cpp	Code formatting: function signature wrapping and removal of trailing blank line
src/rendering/filters/BrightnessContrastFilter.cpp	Code formatting: parameter wrapping for Apply function

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.14%. Comparing base (89f25bc) to head (37fb48f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3211      +/-   ##
==========================================
+ Coverage   76.97%   77.14%   +0.17%     
==========================================
  Files         413      413              
  Lines       21908    21910       +2     
  Branches     6290     6291       +1     
==========================================
+ Hits        16863    16903      +40     
+ Misses       3817     3809       -8     
+ Partials     1228     1198      -30     

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