0.3.1

Changed

• The active model is easier to spot: its frame is stronger and its title now carries
  the accent colour too. The sidebar controls whichever model you used last, which was
  hard to tell apart when several models sit in one note — the title is exactly the name
  the sidebar shows, so the two now point at each other.

Fixed

• Clicking a still image did not fill the sidebar. With the view mode set to
  activate on click — and whenever the context budget had turned a model into a still
  image — the click brought the model back to life but left the 3D view sidebar
  showing "Click a 3D model to control it here.", so the controls seemed broken. A still
  image has no orbit controls, and those were the only source of the "this model is being
  used" signal; the reactivating click now reports itself as the interaction it is.