fix: saturate alpha regardless of HDR

[sindharta]

No description provided.

[Copilot]

Pull request overview

This PR adjusts toon shader fragment output alpha handling so transparency/clipping alpha is clamped (saturate) even when running in FP/HDR paths where SATURATE_IF_SDR is effectively a no-op.

Changes:

• URP: Clamp trans-clipping / clipping-transmode alpha with saturate(_Inverse_Clipping_var + _Tweak_transparency).
• HDRP: Clamp trans-clipping / clipping-transmode alpha using saturate(...) in the forward pass.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
com.unity.toonshader/Runtime/Shaders/URP/UniversalToonBodyShadingGradeMap.hlsl	Uses saturate(...) for trans-clipping alpha so opacity is clamped regardless of FP/HDR behavior.
com.unity.toonshader/Runtime/Shaders/URP/UniversalToonBodyDoubleShadeWithFeather.hlsl	Uses saturate(...) for clipping transmode alpha so opacity is clamped regardless of FP/HDR behavior.
com.unity.toonshader/Runtime/Shaders/HDRP/ShaderPassForwardUTS.hlsl	Updates trans-clipping and clipping-transmode alpha clamping logic in HDRP forward pass.

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