Adreno gpu const float precision

[JackKaiXing]

Clarify Adreno GPU const float precision behavior to prevent unexpected rounding issues.

On Adreno, mediump floats are often treated as 16-bit (FP16), which applies to const float values if they are mediump or default to it. This can cause constants to be rounded or truncated, leading to subtle bugs. This documentation explains this behavior and recommends using highp for critical constants.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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