[CORE-7942] 2.4.y.z/description wysiwyg fix

[trtshen]

This pull request addresses a whitespace handling bug in the detectLanguage pipe, which previously caused spaces between inline elements (like <a> tags) and adjacent text to be stripped in rendered HTML. The fix ensures that original whitespace is preserved and improves the reliability of language detection by increasing the minimum text length threshold.

Whitespace preservation and language detection improvements:

• Changed the addLanguageAttributes() method in utils.service.ts to use the original node.textContent (with whitespace) for rendering, while still using the trimmed text for validation and language detection. This prevents spaces between inline elements and text from being lost.
• Increased the minimum text length required for language detection from 10 to 20 characters, improving detection accuracy and reducing false positives on short phrases.

Documentation and context:

• Added a detailed fix summary in docs/fixes/CORE-7942-whitespace-fix.md, including problem analysis, code examples, solution rationale, impact assessment, and testing recommendations.