- Prevent overlapping hit flashes from stacking, which captured the in-flash
state as the restore value and left crafts permanently white
- Track flashed crafts in a Set so the expiry path can always settle them
- Add purgeCraftTints(), called every ~250 ms from update(), that re-asserts
normal colors on any craft (tracked or roster) not holding a live flash
- Wire purgeRoster in both CombatScene and CombatSystem so the purge covers
the full player + enemy pack, not just Fx's own flashes
- Prune destroyed crafts from the tracking set to avoid leaked references
- Add tests covering overlap extension, kill-seam settle, periodic purge,
roster coverage, and dead-craft pruning
Brian Fertig
63bb6508bb