StepCraft

## StepCraft Mod

- Fixed reward commands so they now execute from the server command source instead of as the claiming player, resolving permission issues with restricted reward commands.
- Fixed `/stepcraft steps` back-navigation so opening step history directly no longer reuses stale admin navigation history.
- Changed `/stepcraft claim_reward` so it now opens the reward-claiming UI instead of immediately running the claim, with back-navigation matching the direct step history flow.
- Hardened admin UI access control so non-ops cannot open or execute admin flows even if stale navigation somehow lands them in those screens.
- Added target-player access checks so self-service screens like day steps, claim rewards, player menu, and auto-claim only work for the viewer unless they are op.