Add shader examples to trigonometric functions
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The change
Resolves #8777 Changes: Adds inline p5.strands examples to the reference documentation for 8 trigonometry functions in src/math/trigonometry.js: • sin() — sine-driven color oscillation • cos() — cosine-driven color oscillation • tan() — rapid tangent-based color transitions • asin() — smooth color transition via asin(sin(t)) • acos() — pulsing color transition via acos(cos(t)) • atan() — sawtooth color effect via atan(tan(t)) • degrees() — convert radians to degrees in shader • radians() — convert degrees to radians in shader Each example uses buildColorShader() with finalColor.begin()/end() and includes a brief explanation that the function can be used in shaders with p5.strands. Screenshots of the change: <!-- If applicable, add screenshots depicting the changes. --> Documentation-only change PR Checklist <!-- To check any option, replace the "○" with a "✓". Be sure to check out how it looks in the Preview tab! Feel free to remove any portion of the template that is not relevant for your issue. --> • ✓ npm run lint passes • ✓ [Inline reference] is included / updated • ○ [Unit tests] are included / updated [Inline reference]: https://p5js.org/contribute/contributing_to_the_p5js_reference/ [Unit tests]: https://github.com/processing/p5.js/tree/main/contributor_docs#unit-tests