fix: prevent artifacts muffling in display cases

[Drefvelin]

Summary

• Update artifact care timestamps when artifacts enter or leave display furniture.
• Treat time inside display furniture as housed, so artifacts recover from muffle instead of accumulating it while stored.
• Add event coverage for the display case transitions.

Validation

• mvn -B --no-transfer-progress clean verify -DskipTests=false -Dmaven.test.skip=false — passed (443 tests and JaCoCo coverage gate).
• The repository has no dev branch; this PR targets its only branch, main.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2bb5b08 and 6760b13.

📒 Files selected for processing (2)

• src/main/java/net/tfminecraft/magic/listener/ArtifactListener.java
• src/test/java/net/tfminecraft/magic/ArtifactListenerTest.java

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