Sanitize RichText HTML with DOMPurify to prevent XSS #234
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This PR sanitizes RichText HTML and blocks script execution.\n\n- Sanitize value via DOMPurify before rendering\n- Use sanitized value for dangerouslySetInnerHTML and iframe srcDoc\n- Add dompurify dependency in general-editor/package.json\n\nPoC (previously exploitable, now neutralized): <img src=x onerror=alert('XSS')> / <svg onload=alert('XSS')>\n\nCloses #229