- Remove OceanMarkTests (geometry/color mapping + construction) per request;
the mark is verified visually in-Editor.
- With the test gone, MapSvgPoint/FromHex no longer need to be `internal`,
and they (plus the SvgOrigin/SvgSize consts) are only used by the Painter2D
path — move them inside `#if UNITY_2022_1_OR_NEWER` and make them `private`,
so the 2021.3 fallback carries no unused members.
Result of a /simplify pass; reuse/altitude/efficiency angles came back clean
(logo-injection duplication left at 2 call sites per the repo's 3+-uses rule).
Shutong Wu
42d9faaaf2