Improve Sentinel-2 visualization guide

[snamber]

Summary

• turn the Sentinel-2 asset guide into a complete true-color visualization workflow
• use a verified low-cloud scene over Sandwich Harbour, Namibia
• read RGB COG windows through the Tilebox storage client and apply a shared display stretch
• include the rendered image with Copernicus Sentinel provenance
• keep cookbook and related navigation cards consistent

Validation

• ran all four published Python blocks verbatim as one script against the public service with released Tilebox SDK 0.59.0
• verified scene, RGB assets, COG windows, array shape and dtype, display scaling, and rendered image
• Vale: 0 errors and 0 warnings in changed docs
• Mintlify broken links: no broken links
• local Mintlify page and image: HTTP 200

[mintlify]

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Project	Status	Preview	Updated (UTC)
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