[BUG] Stars & Planets can render to close to eacht other ->overlap

[Codenix-1349]

🐛 Bug Description

Star nodes on the 3D galaxy map can overlap visually, resulting in intersecting or partially merged spheres.

The actual behaviour:
Multiple star systems are rendered too close to each other, causing visual overlap and reducing map readability. In some cases, connection lines also intersect through star meshes.

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✅ Expected Behaviour

Star systems should never overlap.

Each generated star should:

• Maintain a minimum spatial distance from other stars
• Respect a defined collision / spacing radius
• Preserve clear visual separation for readability and gameplay clarity

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🔁 Steps to Reproduce

1. Start a new game session
2. Let the procedural galaxy generate
3. Zoom into a cluster of nearby systems
4. Observe intersecting star meshes

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🎮 Game Context

• Branch: main
• Commit (if known): unknown
• Godot Version: 4.x
• OS: Windows 10/11
• Build Version (if applicable): Development build

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📂 Affected System

• UI
• Combat
• AI
• GalaxyMap
• Economy
• Audio
• Camera
• Save/Load
• Other:

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⚠️ Severity

• Medium (Gameplay affected, workaround exists)

Reason:
The game remains playable, but visual clarity and navigation accuracy are affected.

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📸 Screenshots / Logs

See attached screenshot:
Stars overlap visually on generated galaxy map.

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🧠 Additional Notes

This likely originates from procedural generation logic not enforcing a minimum distance constraint between star positions.

Possible causes:

• No spatial validation during star placement
• Missing distance check between generated coordinates
• Random generator range too dense
• Scaling factor not considered when positioning MeshInstances
• Star radius not included in spacing calculation

Suggested fix:
Implement minimum distance validation (e.g. sphere packing check) during procedural generation before confirming star placement.