Adds _ComputeZoneSpaceDiff to HBD.lua that computes minimap pin
projection in the parent zone's coordinate space (Eversong 1941) instead
of using the world-coordinate delta. On Ascension, GetPlayerMapPosition
returns Eversong-relative coords for players on Sunstrider, but
GetWorldCoordinatesFromZone(1241) treats them as Sunstrider-relative,
producing a wrong player world position and causing pins to drift or
move opposite to the player.
Fix: (1) Store original zone coords on minimap pins at registration
(AddMinimapIconMap). (2) In drawMinimapPin, recover player's actual
Eversong zone coords by reversing the 1241-bounds conversion. (3)
Convert pin's 1241 zone coord to Eversong zone coord via 1241-world.
(4) Delta in Eversong zone-space, scale to pixels using parent-width/mapRadius.
Falls back to existing world-space math for pins without zone coords.
Xurkon
e5d7d42201