perf: Optimize CountWordInText (dotnet#10050)

* use SearchValues for special chars lookup on NET 8
* only allocate delimiter chars once
* ensure no closure allocations with static lambdas

revert: downgrade playwright to 1.40.0

fix: clean up PDF command help options

fixes dotnet#9696

chore: update test snapshot (dotnet#9657)

feat: Include API summary in <meta description> tag (dotnet#9611)

Fix japanese search (dotnet#9605)

* Fix japanease tinyseg deps

* Refactor import target suffix

* lint

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Co-authored-by: Yufei Huang <yufeih@live.com>

chore: suppress CS1591 for test

chore: Remove `NuGet.Frameworks` dependency from test projects (dotne…

…t#9276)

* chore: fix NuGet.Frameworks package version

* chore: remove NuGet.Frameworks dependency from test projects

* chore: update test sdk version

* chore: remove NuGet.config file that is used for NuGet.Frameworks

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Co-authored-by: Yufei Huang <yufeih@live.com>

feat: add TOC order for toc_rel pick order (dotnet#9406)

chore: update init to use _enableSearch