Add SelectionCuboid extension

[BunnyNabbit]

Resolves #5

Summary by CodeRabbit

• New Features
  • Added cuboid selection management – users can now create 3D cuboid selections with configurable coordinates, names, colors, and opacity levels, and remove selections as needed for improved spatial marking and scene management.

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[BunnyNabbit]

idk should a class be made? classicborne uses arrays for positions but classicborne-server-protocol uses object fields wizh varying names.
but also, classicborne-server-protocol isn't too low-level, it does prefer floats over fixed-points. Color is sort of fixed point, right? maybe it should instead be 0-1? but whatever. follow what block definition does for fog colors for now

[coderabbitai]

📝 Walkthrough

Walkthrough

A new SelectionCuboid extension is introduced to enable clients to manage selection cuboids through packet-based communication. The extension includes methods for adding and removing selections with configurable properties, and is integrated into the server's extension registry and protocol handler.

Changes

Cohort / File(s)	Summary
Server Extension Registry class/Server.mjs	Added SelectionCuboid extension entry (version 1) to the public extensions array.
SelectionCuboid Implementation class/extensions/SelectionCuboid.mjs	New extension class with static packet identifiers (0x1a for add, 0x1b for remove) and public methods addSelection() and removeSelection() that construct and send cuboid selection packets.
Type Definitions class/extensions/extensionTypes.mts	Added SelectionCuboid to defaultExtensions type mapping and introduced a new selection interface with coordinate, identification, and optional color/opacity fields.
Module Export class/extensions/index.mjs	Exported SelectionCuboid from its module file.
Protocol Handler Integration class/extensions/packetHandlers/DefineProtocolExtension.mjs	Added import and instantiation logic for SelectionCuboid in the extension protocol handler's switch statement.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A cuboid of selections, so neat and so grand,
With packets that hop through the Minecraft land!
Add, remove, and coordinate with pride,
Now builders can visualize selections worldwide! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Add SelectionCuboid extension' accurately and concisely describes the main change: introducing a new SelectionCuboid extension.
Linked Issues check	✅ Passed	The PR implements the SelectionCuboid extension with packet handling, type definitions, and public API as specified by the Minecraft Classic Protocol specification.
Out of Scope Changes check	✅ Passed	All changes are scoped to implementing the SelectionCuboid extension; no unrelated modifications are present.

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✨ Finishing touches

• 📝 Docstrings were successfully generated.

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🔥 Problems

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[coderabbitai]

Note

Docstrings generation - SUCCESS
Generated docstrings for this pull request at #43

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarQube Cloud