Resolve "Quote and Report actions on thread messages"

Closes #2247 (closed)

Testing strategy

1. Select "Report" in a thread message context menu -> see successful report request in DevTools network tab
   1. Reporting user's own messages is not alowed
2. "Quote"
   1. quoting a message increases the height of the input box
   2. quoting a message when the input box is empty results in quote starting from the beginning of the input <quote>\n\n
   3. quoting a message when there is already a draft in input box appends quote to the draft <draft>\n<quote>\n\n
3. adding more text to the chat input area expands it, removing all text (draft='') shrinks it.