Move marker animation tick to DLL-side OnWorldUpdate hook

- Hook OnWorldUpdate (0x482EA0) for per-frame tick while world is active
- Remove Lua OnUpdate animation driver (ProcessMarkerAnimations)
- Add DistanceToMark(index) Lua API returning player-to-marker distance
- Track marker positions DLL-side for distance queries
- Clean up positions on marker clear and world teardown

src/main.zig

@@ -262,7 +262,7 @@ fn registerLuaFunctions() void {
         registerFunction("WorldMarker", @intFromPtr(&markers.luaWorldMarker));
         registerFunction("ClearWorldMarker", @intFromPtr(&markers.luaClearWorldMarker));
         registerFunction("GetPlayerPosition", @intFromPtr(&markers.luaGetPlayerPosition));
-        registerFunction("ProcessMarkerAnimations", @intFromPtr(&markers.luaProcessAnimations));
+        registerFunction("DistanceToMark", @intFromPtr(&markers.luaDistanceToMark));
     }
 }