docs: add code, cjk, math, and mermaid to @source

[aradhyacp]

Description

This PR updates the documentation configuration to include all relevant @streamdown/* packages in the @source configuration.

Previously, only:

@source "../node_modules/streamdown/dist/*.js";

was included.

Now the following modules are also sourced:

• @streamdown/code
• @streamdown/cjk
• @streamdown/math
• @streamdown/mermaid

@source "../node_modules/streamdown/dist/*.js";
@source "../node_modules/@streamdown/code/dist/*.js";
@source "../node_modules/@streamdown/cjk/dist/*.js";
@source "../node_modules/@streamdown/math/dist/*.js";
@source "../node_modules/@streamdown/mermaid/dist/*.js";

This ensures all Streamdown extensions are properly included in documentation generation.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Refactoring (no functional changes)

Related Issues

Fixes #427
Closes #427
Related to #427

Changes Made

1. • Expanded @source entries to include all @streamdown/* extensions
2. • Ensured documentation has code, CJK, math, and mermaid modules
3. • Added corresponding changeset

Testing

• All existing tests pass
• Added new tests for the changes
• Manually tested the changes

Test Coverage

No runtime code changes. Documentation configuration update only.

Screenshots/Demos

N/A

Checklist

• My code follows the project's code style
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have created a changeset (pnpm changeset)

Changeset

• I have created a changeset for these changes

Additional Notes

This change does not affect runtime behavior. It strictly improves documentation coverage and build completeness.

[vercel]

@aradhyacp is attempting to deploy a commit to the Vercel Team on Vercel.

A member of the Team first needs to authorize it.

[haydenbleasel]

@aradhyacp these sources should only be included if the relevant package is installed otherwise it will cause an error, need to note that in the docs

[haydenbleasel]

it may be worth adding them to the individual plugin pages rather than the getting started / setup docs

[aradhyacp]

cool, i will push the required changes asap :)

[aradhyacp]

@haydenbleasel changes are in let me know if any changes required :)

[haydenbleasel]

awesome thanks @aradhyacp 🙏