Fix egocentric image order and waypoint labels for reverse paths

Arrow variants now include both arrow and side question styles

Use arrow-style questions for td_midpoint and dh_midpoint variants

Update arrow variant questions to use 'along the arrow' phrasing

Simplify structure - remove duplicate image fields

Add all 8 variants with updated question format

Update question format - ego desc before question

Sample sideview-only dataset with proper image tags