Open Display wall settings on sneak-right-click

[rubensworks]

Sneak-right-clicking a Display Chest Wall with an empty hand did nothing, except on a hidden face. The Interface, Redstone and Magnet walls all open their settings on sneak-right-click, so the Display wall now does the same, on any face.

• Plain right-click is unchanged: it inserts all of the shown item right after an insert, and opens the settings otherwise.
• The tooltip now ends with "Sneak-right-click with empty hand to configure.", like the other configurable walls.

Testing

• ./gradlew build passes. Game tests pass on NeoForge (101), Forge (101) and Fabric (103).
• I removed the game test assertion for the old "sneaking does nothing" behavior. The new behavior opens a menu, and NeoForge doesn't open menus for game test mock players, which is why the other walls' settings tests also create menus directly.
• NeoForge dev client via clientdevbridge: sneak-right-click opens the Display settings on the front and side faces, and plain right-click still opens them too.
• On Fabric, opening the Display settings (by any click) disconnects the client until Fix Display wall settings disconnecting Fabric clients #13 is merged.

🤖 Generated with Claude Code

https://claude.ai/code/session_01RSz5r6eowhjNuANBjZE2v6

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Generated by Claude Code

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Coverage Report for CI Build 38112181335

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Coverage: 76.532%

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Coverage Stats

Relevant Lines:	6892
Covered Lines:	5577
Line Coverage:	80.92%
Relevant Branches:	2849
Covered Branches:	1878
Branch Coverage:	65.92%
Branches in Coverage %:	Yes
Coverage Strength:	9.89 hits per line

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