Add Nexo custom block and furniture support for island levelling

[tastybento]

Summary

Closes #389

Nexo is the successor to Oraxen and ships its own API (com.nexomc:nexo). This PR adds full support for all Nexo custom-block mechanics and furniture so they contribute to island level calculations.

Custom blocks (noteblock / stringblock / chorusblock mechanics)

• NexoBlocks.customBlockMechanic(Location) is called in processBlock() alongside the existing ItemsAdder and Oraxen checks. If a Nexo custom block is found at a location it is counted as "nexo:<itemId>" and the method returns early (no double-counting with the vanilla block beneath).
• NexoItems.idFromItem(ItemStack) is checked in countItemStack() so Nexo items inside containers are counted when chest-scanning is enabled.

Furniture mechanic

• Nexo furniture uses ItemDisplay entities rather than blocks, so it is invisible to the chunk block scanner.
• After the block scan, a new handleNexoFurniture() step iterates entities in every island chunk. NexoFurniture.furnitureMechanic(entity) returning non-null identifies the furniture's base entity; each such entity within the island's protected bounds is counted as "nexo:<itemId>".

Other changes

• pom.xml – Nexo repository and provided-scoped dependency added (with triumph-gui excluded to avoid a transitive resolution failure).
• Level.isNexo() – convenience helper that checks the plugin is enabled and not in the disabled-plugin-hooks list.
• BlockConfig.isOther() – validates nexo: prefixed keys via NexoItems.exists().
• Utils.prettifyObject() – strips the nexo: prefix before looking up display names, mirroring the existing oraxen: handling.

Configuration

Values are set in blockconfig.yml using the Nexo item ID, exactly like Oraxen:

blocks:
  nexo:my_chair: 5
  nexo:my_table: 3
  nexo:my_noteblock_block: 10

To disable Nexo integration entirely, add Nexo to disabled-plugin-hooks in config.yml.

Test plan

• Place Nexo custom blocks (noteblock / stringblock / chorusblock mechanics) on an island and run /is level — they should contribute to the level.
• Place Nexo furniture on an island and run /is level — furniture should contribute to the level.
• Put Nexo items inside a chest and verify they are counted when include-chests: true.
• Verify Oraxen and ItemsAdder blocks still work as before (priority order is unchanged).
• Verify that when Nexo is not installed the calculation completes without errors.
• Verify blocks / furniture outside the island's protected bounds are not counted.

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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