refactor(stats/strided/dnanmidrange): replace inline 0.0/0.0 with STD…

[Harshit-Lalwani]

…LIB_CONSTANT_FLOAT64_NAN from stdlib/constants/float64/nan

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Resolves #11743

Description

What is the purpose of this pull request?
This pull request:

This pull request:

• Replaces inline 0.0f/0.0f Float32 NaN generation with STDLIB_CONSTANT_FLOAT32_NAN macro from constants/float32/nan

Related Issues

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• NA

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I consulted ChatGPT 5.5 to understand the codebase, but the proposed changes were fully authored manually by myself.

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