fix: debris trail lines rendering with harsh z-fighting artifacts against Earth atmosphere mesh

[SourabhX16]

Problem Statement

Line paths in DebrisTrail.tsx pass through same depth plane as Atmosphere.tsx, creating flickering z-fighting artifacts.

Why It Matters

Flickering lines impair visual aesthetics during orbit viewing.

Expected Behaviour

Configure depthOffset or set renderOrder on OrbitVisualizer and DebrisTrail line materials.

Acceptance Criteria

• Orbit trail lines render cleanly without flickering z-fighting artifacts against Earth atmosphere.
• Render order specified.
• Visual depth sorting correct.

Likely Affected Files / Components

• src/components/DebrisTrail.tsx
• src/components/OrbitVisualizer.tsx