- Replace textarea+toolbar with Quill.js (free, MIT) for body editor
- Full WYSIWYG: headings, bold/italic, lists, blockquote, code, link (inline, no popup)
- Rich Text toggle button on each question text field and option text field
- Plain textarea by default; toggle activates mini Quill editor per field
- New 'Multiple Select' question type: checkboxes, all correct must be chosen
- Backend scoring: allCorrectChosen && noWrongChosen
- Results show all correct options highlighted, wrong selections flagged
- quiz display uses sanitizeHtml for question/option text (supports formatted HTML)
- sanitizeHtml allows Quill class attrs (ql-indent, etc.)
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