Fix #8756: Allow computed array indexing on non-storage vectors

The change

<!-- Thank you for contributing! Please use this pull request (PR) template. In the description field of this PR, include "resolves #XXXX" tagging the issue you are fixing. If this PR addresses the issue but doesn't completely resolve it (ie the issue should remain open after your PR is merged), write "addresses #XXXX". --> Resolves #8756 Changes: <!-- Add here what changes were made in this pull request and if possible provide links showcasing the changes. --> This PR fixes the bug where get() could only be used on storage buffers in p5.strands, preventing array indexing (arr[0]) on non-storage vectors like those returned from helper functions. Root Cause: The transpiler converted ALL computed member access (arr[0]) to .get() calls, but the get() method in strands_node.js had a guard that only allowed it for storage buffers, throwing "get() can only be used on storage buffers" for non-storage vectors. • src/strands/strands_node.js • src/strands/strands_transpiler.js • src/webgl/strands_glslBackend.js (Added ARRAY_ACCESS handler, missing from GLSL backend - flagged by @Nixxx19 ). • test/unit/webgpu/p5.Shader.js Screenshots of the change: <!-- If applicable, add screenshots depicting the changes. --> 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