Allow <details> and <summary> HTML tags in sanitized output

[ppastur]

Summary

Fixes #412

The sanitizeHtmlOutput function uses sanitize-html with an explicit tag allowlist. <details> and <summary> were not included, so native HTML collapsible sections were silently stripped from rendered pages regardless of the config.markdown.html: true setting (which only affects the marked step, not the subsequent sanitization pass).

Changes

• Added 'details' and 'summary' to allowedTags
• Added 'open' to allowedAttributes for details, so <details open> renders correctly (section expanded by default)

Test

A wiki page with the following content now renders collapsible sections correctly:

```markdown

Click to expand

Content here.

\`\`\`

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.58%. Comparing base (a42f280) to head (7d0065f).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #416   +/-   ##
=======================================
  Coverage   62.58%   62.58%           
=======================================
  Files          33       33           
  Lines         850      850           
  Branches      236      236           
=======================================
  Hits          532      532           
  Misses        269      269           
  Partials       49       49           

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[ppastur]

Hi @ryanlelek , I had a little time to look at this and created a fix for your review. Ive tested this locally and seems to fix the issue. Let me know if there is anything you would like changed.