docs: standardize heading case in documentation

[chenjiahan]

Summary

• Update heading case in multiple markdown files to follow consistent style
• Add heading-case check to format:js script in package.json
• Bump heading-case dependency from 1.0.6 to 1.0.7

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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Latest commit:	65586ba
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Preview URL:	https://dac8a13e.rspack-v2.pages.dev
Branch Preview URL:	https://docs-heading-case-0212.rspack-v2.pages.dev

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[Copilot]

Pull request overview

Standardizes Markdown heading capitalization across docs/READMEs and enforces the style via the heading-case CLI in the repo’s JS formatting scripts.

Changes:

• Update heading capitalization in multiple .md/.mdx files to sentence case.
• Add heading-case to format:js / format-ci:js and bump it to ^1.0.7.
• Move heading-case dependency management to the root workspace (lockfile updated accordingly).

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
website/package.json	Removes heading-case from website devDependencies (now managed at repo root).
website/docs/zh/guide/migration/rspack_1.x.mdx	Adjusts a section heading to sentence case.
website/docs/zh/config/module-rules.mdx	Adjusts page heading to sentence case.
website/docs/zh/blog/announcing-1-7.mdx	Adjusts a section heading to sentence case.
website/docs/en/guide/tech/rsc.mdx	Adjusts section headings to sentence case.
website/docs/en/guide/migration/rspack_1.x.mdx	Adjusts multiple section headings to sentence case.
website/docs/en/contribute/development/project.md	Adjusts many headings to sentence case for consistency.
website/docs/en/config/module-rules.mdx	Adjusts page heading to sentence case.
website/docs/en/config/filename-placeholders.mdx	Adjusts section headings to sentence case.
tests/e2e/cases/lazy-compilation/cross-origin/README.md	Adjusts heading capitalization in test documentation.
pnpm-lock.yaml	Updates lockfile for [email protected] and importer placement.
packages/rspack-test-tools/README.md	Adjusts a section heading to sentence case.
package.json	Adds heading-case to formatting scripts and bumps dependency to ^1.0.7.
crates/rspack_tools/README.md	Adjusts a command section heading to sentence case.
crates/rspack_binding_api/README.md	Adjusts headings to sentence case.
AGENTS.md	Adjusts headings to sentence case.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[github-actions]

📦 Binary Size-limit

Comparing 65586ba to fix: generating correct types for @rspack/lite-tapable (#13048) by Qingyu Wang

🙈 Size remains the same at 48.68MB

[github-actions]

Rsdoctor Bundle Diff Analysis

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Found 5 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Change
react-10k	5.7 MB	0
react-1k	825.4 KB	0
react-5k	2.7 MB	0
rome	984.2 KB	0
ui-components	2.2 MB	0

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