- Edit button only shown for current user's own messages (not AI, not
  other users); AI detection uses creator.type instead of name string
- Reply/Resolve buttons stay at initial height as textarea grows
- Options dropdown uses table layout for aligned columns
- Demo file showcases Pandoc features (math, citations, code, footnotes)
- Screenshot moved from assets/ to examples/
- Gitignore: add dist/, move personal dirs to .git/info/exclude