Fix: preserve HTML structure in Change and Problem description

[Rom1-B]

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !43955
• The description field (content) of Changes and Problems was passed through Toolbox::stripTags() before rendering, which removed all HTML structure generated by the rich text editor (paragraphs, lists, headings). The result was one undivided text block. Removing the strip call lets displayText() process the HTML natively via RichText::getEnhancedHtml().

Screenshots (if appropriate):