Panewright 0.6.25

Fixed

• The bar appears once, fully formed, in the right place. Startup used to
  be visible theater: items bolted on one by one, then the whole bar
  jumped to its corrected position (the display's y_offset unit ratio was
  relearned and discarded every boot). The bar is now born hidden and
  revealed after its first full paint, and the learned ratio persists so
  the emitted geometry is right from birth. Verified across two boots:
  the first learns (one last visible correction), every boot after is
  born in place with zero corrections.