Translate "React Labs 2025-04" blog article

[smikitky]

• "View Transition" は MDN では「ビュー遷移」となっているので合わせました。React のトランジションと紛らわしいところを訳し分けできる、という意味でもいいかな、と。
• key とか ref とか state とかの原語のまま残す用語は最小限にしたいのですが、Activity はもうどうしようもないのでそのままです。「Offscreen だと意味が狭すぎるから Activity で広くしました」の意味が分からない…（愚痴）
• ところどころで "route" をページと訳していますが意図的なものです。カタカナだと root とまぎらわしいので。既存記事でもよくやっています。

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Project	Deployment	Preview	Comments	Updated (UTC)
legacy-ja-reactjs-org	Ignored	Preview		Oct 24, 2025 5:47am

[Copilot]

Pull Request Overview

This PR translates the "React Labs 2025-04" blog article from English to Japanese, ensuring terminology consistency (e.g. for "View Transitions") and clear communication in the Japanese version.

• Updated sidebar entries in src/sidebarBlog.json
• Translated the blog index card in src/content/blog/index.md
• Translated the full blog post in src/content/blog/2025/04/23/react-labs-view-transitions-activity-and-more.md

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/sidebarBlog.json	Updated titles for sidebar links to reflect Japanese terminology
src/content/blog/index.md	Adjusted BlogCard title and description to the translated version
src/content/blog/2025/04/23/react-labs-view-transitions-activity-and-more.md	Comprehensive translation of the article content, preserving technical terms per guidelines

[honey32]

please fix conflict

[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

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

Five Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/404	130.45 KB (🟡 +23 B)	241.01 KB
/500	130.46 KB (🟡 +23 B)	241.02 KB
/[[...markdownPath]]	133.23 KB (🟡 +23 B)	243.79 KB
/errors	130.7 KB (🟡 +23 B)	241.26 KB
/errors/[errorCode]	130.68 KB (🟡 +23 B)	241.24 KB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 10% or more, there will be a red status indicator applied, indicating that special attention should be given to this.

[smikitky]

@honey32 コンフリクト修正しました

[honey32]

ありがとうございます！

[smikitky]

この1か所だけ再確認お願いできないでしょうか

[honey32]

返信しました！

[smikitky]

@honey32 OKならマージお願いしますー