Fixed HTML rendered including empty trailing paragraphs

[ronaldlangeveld]

ref #441

• Added normalizeEmptyContent helper function to convert Lexical's default <p><br></p> (used for empty editor content to maintain contentEditable functionality) into an empty string, preventing unwanted HTML from being submitted to the server.

• Updated the value getter in src/elements/editor.js to apply this normalization after sanitizing the generated HTML, ensuring clean data persistence without breaking editor usability.

• This fix addresses the issue where empty editors would submit <p><br></p> instead of an empty string, improving data integrity and user experience by avoiding meaningless HTML storage in Action Text fields.

• Follows knowledge from my previous work on Ghost's Lexical Editor :)

[samuelpecher]

Thanks for the PR! I like the direct approach vs checking the node state.

I've left a few comments to just touch up the code in line with our conventions.

[samuelpecher]

I think the unnested route is clearer here

Suggested change

	this.cachedValue = normalizeEmptyContent(
	sanitize($generateHtmlFromNodes(this.editor, null))
	)
	const html = sanitize($generateHtmlFromNodes(this.editor, null))
	this.cachedValue = normalizeEmptyContent(html)

[samuelpecher]

This be rolled into HTML helpers file, or sanitization. We can keep it terse without the documentation, the intent is nice and clear.

[samuelpecher]

I'd lean towards dropping the unit test and relying on one ruby system test.

[ronaldlangeveld]

Thank you so much for the thorough feedback @samuelpecher . Let me know if there's anything else I can do, happy to help.