Combat sparks now show as soft glints instead of cubes

Hit, burn, cryo, ward and death sparks in Shattered Rift now use a shared soft textured glint instead of opaque cubes. All ten palette materials for these effects are retained. The first screenshot is from the player camera. The others compare the new glint with the old cube look at the same settings, including spark count, velocity, size and age. This is scoped visual progress. High-refresh motion and release readiness remain open.