Plugin `sendHtml` will always insert the content as a block

When plugins use `sendHtml` and attempt to insert inline content, it will always get wrapped in `

` tags. The reason:

> When you use DOMParser().parseFromString(e.data.details, 'text/html'), the browser creates a full HTML document structure, and then when ProseMirror parses it, it sees inline content ( with ^{) but the document root expects block content.}

AI soln that I have not vetted:
```
if (e.data.action === 'sendHTML') {
const dom = new DOMParser().parseFromString(e.data.details, 'text/html');
const fragment = proseDOMParser.fromSchema(window.view.state.schema).parse(dom.body);

// If the fragment contains only inline content, insert it as inline content
if (fragment.childCount === 1 && fragment.firstChild.type.name === 'paragraph') {
// Extract the inline content from the paragraph
const inlineContent = fragment.firstChild.content;
window.view.dispatch(
window.view.state.tr.replaceSelection(
new Slice(inlineContent, 0, 0)
)
);
} else {
// For block content, use the original approach
window.view.dispatch(window.view.state.tr.replaceSelectionWith(fragment));
}
}
```

Start by locating the plugin handler for the `sendHTML` action and read `schema.js` around line 60 to understand the block-content requirement. Reproduce an inline insertion such as an `` with `<sup>` and compare it with block HTML. Done means inline content is inserted without an unwanted `</sup>

` wrapper while block content still works.

Written by the indexing model from the issue text.