feat(doc-e2e): add doc-tools e2e

[sanyuan0704]

Summary

🤖 Generated by Copilot at 19c4b5a

This pull request adds e2e tests for the doc-tools plugin of the modern.js framework. It creates two fixtures, one for the base doc functionality and one for the i18n support, and uses puppeteer and modernTestUtils to verify the rendering and behavior of the doc pages. It also improves the TypeScript code and the CSS styling of the appearance switch button in the SwitchAppearance component. It updates the @modern-js/doc-core package and adds a changeset file for the release workflow.

Details

🤖 Generated by Copilot at 19c4b5a

• Add doc-tools e2e tests for base and i18n fixtures (F4-F19)
  • Add modern-sidebar and modern-nav-appearance classes to the corresponding elements (link, link)
  • Remove unnecessary non-null assertion operator from setTheme function call (link)

Related Issue

Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

[changeset-bot]

🦋 Changeset detected

Latest commit: ede4f72

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

Patch coverage: 74.78% and project coverage change: +0.69 🎉

Comparison is base (99693f0) 57.59% compared to head (ede4f72) 58.29%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3472      +/-   ##
==========================================
+ Coverage   57.59%   58.29%   +0.69%     
==========================================
  Files         672      670       -2     
  Lines       17794    17773      -21     
  Branches     3876     3867       -9     
==========================================
+ Hits        10249    10360     +111     
+ Misses       6934     6808     -126     
+ Partials      611      605       -6     

Impacted Files	Coverage Δ
packages/cli/core/src/nodeApi.ts	0.00% <ø> (ø)
packages/cli/doc-plugin-auto-sidebar/src/index.ts	0.00% <0.00%> (ø)
...s/cli/plugin-changeset/src/commands/releaseNote.ts	36.95% <0.00%> (ø)
packages/cli/plugin-changeset/src/utils/index.ts	100.00% <ø> (ø)
packages/cli/core/src/createCli.ts	72.00% <72.00%> (ø)
packages/cli/plugin-data-loader/src/cli/loader.ts	81.81% <83.33%> (ø)
packages/cli/core/src/config/loadConfig.ts	83.33% <85.71%> (+0.25%)	⬆️
packages/cli/core/src/utils/initAppDir.ts	88.88% <88.88%> (ø)
packages/cli/core/src/index.ts	71.42% <100.00%> (-0.62%)	⬇️
packages/cli/core/src/types/index.ts	100.00% <100.00%> (ø)
... and 4 more

... and 91 files with indirect coverage changes

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