Feat/issue 10 planet shaders

[theshantanujoshi]

Summary

This PR implements a library of procedural climate-aware shaders for planets, addressing Issue #10. It replaces the simple colored spheres with high-fidelity, climate-specific surfaces that activate upon close zoom.

Key Changes

• Shader Gallery: Created a new library of GLSL shaders in components/galaxy/shaders/planet/ for:
  • Desert (Tatooine): Wind-rippled dunes and twin-sun highlights.
  • Ice (Hoth): Cracked surfaces and polar auroras.
  • Ocean (Kamino): Animated waves and foam.
  • Lava (Mustafar): Glowing magma fissures and convection cells.
  • Gas Giant (Bespin): Banded turbulence and swirls.
  • Forest (Endor): Canopy noise and atmospheric haze.
  • City (Coruscant): Emissive grid lights and traffic on night-side.
• Metadata Integration: Extended PlacedPlanet to include physical attributes from SWAPI (climate, terrain, surface water) and added a keyword-based selector to map planets to their appropriate climate shader.
• Performance Optimization: Shaders only activate when the camera is within 80 units of a planet, gracefully transitioning back to lightweight MeshBasicMaterial at a distance.
• UX: Respects prefers-reduced-motion by freezing animated shader uniforms.

Verification Results

• Visuals: Verified high-detail surfaces for Tatooine, Coruscant, and Mustafar via close-up screenshots.
• Performance: Confirmed smooth transitions and efficient rendering during galaxy navigation.
• Lore: Shaders accurately reflect canonical planetary biomes.

Fixes #10

[safedep]

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[adhit-r]

Holding this because it inherits the #38 TypeScript failures and adds one more shader error:

components/galaxy/Planet.tsx(115,7): 'shaderMaterial.uniforms.uTime' is possibly 'undefined'.

Please guard or strongly type the uniform before assigning to uTime.value.

There is also a runtime/performance issue in the same area: ref.current.getWorldPosition(new THREE.Vector3()) allocates a new vector every frame for every planet. Please keep a reusable scratch Vector3 in a ref instead.