Track Changes — edit in suggestions & Word round-trip

✨ New Features

• Track Changes is here — switch on Suggest Mode and every edit becomes a tracked suggestion that you or a collaborator can accept or reject, just like in Word.
• DOCX track changes support — tracked changes carry through when you import or export Microsoft Word documents, so suggestions survive the round-trip.

🔧 Improvements

• Inserted paragraphs now appear correctly in the suggested-edits list, alongside your manual edits.
• More reliable grouping of related tracked changes when you review a document.