fix: Prioritize first-load of model

- When launcher is in foreground, especially with taskbar, it may
  stall/lock the UI thread.
- If the model is in the middle of loading and hasn't ever finished
  loading, it may need the user to navigate to another app or lock the
  device to finish model load, which is terrible UX
- This has worked so far but is a noticeable issue on tablets, and slower
  phones too
- Do not wait for idle and continue scheduling work on the UI thread so
  that the model has fully loaded at least once. After this, it can stall
  all it wants