[p5.strands] Auto-return input objects if omitted

[vietnguyen2358]

Resolves #7994
Addresses #7992

Changes:

• Implemented normalization in p5.Shader.modify() to auto-return input objects when return is omitted
• Skip normalization for void hooks or mismatched return types

Live: https://editor.p5js.org/viet.nguyen2358/sketches/J1H2c-kWN

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

Contributors:
@phamjoshua6, @SaKaR22

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Thank You!

[perminder-17]

Hi, really thanks for working on this. For 1.x versions, your logic works well. Currently we are not adding any features to the 1.x versions (i.e. the main branch), I think you need to open up the PR targeting the dev-2.0 branch as well, and

For this PR if you would still like to continue adding this to main branch, you could probably add visual tests to it instead of unit tests. Do you think that would make sense to you and your team?

Really thanks for working on this.

[vietnguyen2358]

Thanks so much for the clarification. We'll open a new PR targeting the dev-2.0 branch as suggested. Since dev-2.0 is the current active branch, should my team and I also update the current unit tests to visual tests?

For this current PR, I think we can close it and just focus on the other branch.