Add an <img> API reference

[aurorascharff]

Adds an API reference for the built-in browser <img> component.

The new reference:

• documents image-specific props and caveats
• explains automatic image preload hints during server rendering, including opt-out behavior and how frameworks and component libraries may provide different defaults
• documents how images participate in synchronized View Transition reveals

It also adds <img> to the React DOM components index and sidebar.

The automatic preloading behavior was introduced in react/react#27191 and discussed in react/react#34217.

[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

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

One Page Changed Size

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

Page	Size (compressed)	First Load
/[[...markdownPath]]	130.03 KB (🟡 +9 B)	245.18 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.

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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.

[eps1lon]

worth explaining why? With an empty attribute the browser would make a request to the current page.