fix: hide incompatible download options

[ulofiai]

Description

• hide incompatible installation methods, package managers, platforms, and operating systems instead of rendering them as disabled options
• exclude AIX from the installation-method selector while keeping it available for official prebuilt binaries
• add unit coverage for compatibility filtering and explicit exclusions

AIX remains available in the prebuilt selector because Node.js publishes official aix-ppc64 binaries.

Validation

• git diff --check
• TypeScript syntax checks for the changed TSX files
• targeted behavior checks for Linux/Chocolatey and AIX install/prebuilt visibility
• full pnpm format, pnpm test, and pnpm build were not run because dependencies are not installed in the bundle environment

Related Issues

Fixes #8638.

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Aug 6, 2026 5:47pm

[cursor]

PR Summary

Low Risk
UI-only download page behavior with targeted filtering; parseCompat remains for tests and under the new helper.

Overview
Download selectors no longer show incompatible choices as disabled entries—they are omitted via a new filterDropdownItems helper that applies existing compatibility rules and drops disabled rows.

Operating system dropdowns can take an optional exclude list. On the main download pages, the install-instructions row uses exclude={['AIX']} so AIX does not appear there, while the prebuilt-binaries row still shows AIX because official aix-ppc64 builds exist.

Unit tests cover compatibility filtering and explicit exclusions.

^{Reviewed by Cursor Bugbot for commit 19850eb. Bugbot is set up for automated code reviews on this repo. Configure here.}