[Cride24]

This brings the reviewed reward-preview implementation from #173 to Minecraft 1.20.1 (Forge and Fabric). Reward previews are off by default through showRewardPreviews in the client config; quests can inherit that setting or override it with show_rewards_before_completion (Show/Hide in the editor). Completed quests retain the original rewards-only panel, and previews cannot be selected or collected early.

The review response, design details, and screenshots are in the #173 discussion.

Closes #167.

Validation

• Focused headless checks and Forge/Fabric 1.20.1 builds passed for this branch.
• The contributor tested the updated build in both Forge and Fabric 1.20.1. The client setting and Default/Show/Hide quest overrides behaved as expected; the reward display, editor cycle, and tested collection/choice cases worked, except for the Fabric loot-table case below.
• On Fabric 1.20.1, claiming the dungeon loot-table reward failed. The log reports an IllegalArgumentException in LootTableReward.applyReward for parameters not allowed by LootContextParamSets.EMPTY. That method is unchanged from the upstream 1.20.1 branch; the same test worked on Forge 1.20.1 and NeoForge 1.21.1. This separate issue is not addressed here.
• Multiplayer has not been tested.

This contribution was prepared with AI assistance; the in-game tests were performed by the contributor.

[Cride24]

I updated this branch to match the reviewed 1.21.1 implementation. Please see my response on #173 for the change-by-change explanation and screenshots.

The updated 1.20.1 build was tested in game on Forge and Fabric. The reward-preview settings and tested reward cases passed, apart from a Fabric loot-table claim failure noted in the PR description; I will report that separately.