ci: test default Docker Desktop versions

[AaronFeledy]

What does this do?

• resolves the platform-specific Docker default from Lando's config in the Linux, macOS, and Windows setup workflows
• installs that exact version and verifies the installed product version
• re-enables the macOS pull request workflow and updates macOS workflows to the current macOS 26 runner
• runs a compact LAMP/HTTPS smoke test on Windows, where Docker Desktop can run on the hosted runner
• skips CA trust installation on macOS 26 because its noninteractive keychain command hangs

The macOS job verifies installation and version only. GitHub-hosted macOS runners do not support the nested virtualization required to start Docker Desktop.

Related to #472.

How was this tested?

• npm test — 199 passing, 36 pending
• workflow YAML parsing
• git diff --check
• macOS CI verified lando setup installs the configured Docker Desktop version
• Windows CI exercises the installed Docker Desktop with the LAMP/HTTPS smoke test

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