Fix Fabric Loom Build Setup

The project fails during `./gradlew build` because the current stack—Gradle 8.10.2, Fabric-Loom 1.7.4 and Java 21 (Temurin 21.0.11)—isn’t playing nicely together. I need the build environment repaired so I can compile and test the mod locally without errors.

Current state
• Wrapper points to Gradle 8.10.2.
• Java 21 is the only JDK configured.
• No custom logic in build.gradle beyond the Loom version bump.
• Source is on GitHub; cloning and pushing fixes through a branch or pull-request is preferred.

What I expect from you
1. Diagnose and resolve the incompatibility between the selected Gradle, Fabric-Loom and Java versions.
2. Adjust or pin versions as needed (fabric-loader, loom plugin, Gradle wrapper, JDK toolchain) so the build passes cleanly with `gradlew build`.
3. Confirm the mod launches in a development environment (intelliJ run config or Fabric’s bundled dev client).
4. Document the changes in a short markdown summary—why each version was chosen, files touched and any commands I should know.

Deliverables
• Updated Gradle wrapper, build scripts and configuration files committed to the repo.
• A successful build log/screenshot.
• Brief CHANGELOG.md or PR description outlining the fixes.

Acceptance criteria
✔ Running `./gradlew build` on a clean clone completes without errors.
✔ The game starts with the mod loaded when using the dev client task.
✔ Explanation of changes is clear and reproducible.

If additional tooling (e.g., Java 17 instead of 21, Loom 1.4.x, or the Kotlin Gradle plugin) ends up being necessary, feel free to implement it as long as the above criteria are met.