docs(ja): translate cacheSignal page

[nihar-ux18]

This PR translates the cacheSignal documentation page into Japanese.

Changes

• Translated src/content/reference/react/cacheSignal.md from English to Japanese.
• Preserved the original Markdown structure, code examples, and links.
• Followed the repository's Japanese writing conventions and passed the lint checks.

Closes#933

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
legacy-ja-reactjs-org	Ignored	Preview	Jul 12, 2026 9:46am

[nihar-ux18]

Hi @gobo-cello,

I've opened a PR for the cacheSignal translation. When you have a chance, I'd appreciate it if you could take a look. Thank you!

[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[honey32]

Thank you very much!

I've found a few points to improve,

[nihar-ux18]

@honey32 Thanks for the review! I have addressed the suggested translation changes.

[nihar-ux18]

@honey32 Thanks! I've applied the suggested change.

[honey32]

Thank you very much! LGTM!

wait for @smikitky 's review

[nihar-ux18]

Hi @smikitky,

Just following up on this PR. I've addressed all the review feedback from @honey32, and the PR has been approved on their side.

When you have some time, I'd appreciate it if you could review this PR as well.

Thank you!