Optimize shadow performance#301

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AllenPocketGamer wants to merge 2 commits intodecentraland:mainfrom

AllenPocketGamer:impr-shadow

Commits on Oct 8, 2025

refactor shadow settings to use `to_shadow_config` method for improved clarity and maintainability
AllenPocketGamer
committed
enhance shadow settings to include 'Middle' option and update related configurations for improved quality and performance
AllenPocketGamer
committed