fix: let lecterns hold written books when no project is open

[Drefvelin]

Summary

• A lectern with no research project now keeps vanilla book behaviour: place a written book or book and quill, and open a book already on the lectern.
• An active project still takes the lectern. Right-click opens that station, including when the player is holding a book.
• An empty hand does not cancel the click when the other hand holds a lectern book, so that book can still be placed.

Test plan

• Development build on the pull request succeeds, including unit tests and the runtime JAR check.
• Right-click an empty lectern with a written book and confirm it is placed.
• Right-click that lectern to read the book, then take it back out.
• Right-click an empty lectern with a research paper and confirm a project still starts.
• Right-click a lectern that already has a project and confirm the research menu still opens.

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📥 Commits

Reviewing files that changed from the base of the PR and between cf8151a and 2e3e43b.

📒 Files selected for processing (2)

• src/main/java/net/tfminecraft/research/manager/ResearchManager.java
• src/test/java/net/tfminecraft/research/manager/ResearchManagerTest.java

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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