[FIX] mail: various small UI tweaks/fixes

- put the mentionned partners and the attachment above the composer
  instead of below
- debounce some links in thread.js to prevent double loading views when
  double-clicking
- readd the # in front of the channelname of the title of the client action
- give the channel_id to the thread in a chat window, so it does not
  display the channel name everytime it displays a message
- correctly close dm chat window when the dm channel is closed in the
  main sidebar
- simplify the help messages when a channel is empty

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