Support pasting selected cards when carddetails textarea is focused

to remove the ambiguity in Add copy to current space option - #11 by tonytran

technotes to self:

  • keyboardshortcuts needs to spin off paste (maybe also copy/cut) events into seperate space.vue (store?) component
  • carddetails needs to check against the new component methods to determine whether to paste regular text or close the card and paste the clipboarddata