fix(ci): pin smoketest Node to package.json devEngines version

[dormouse-bot]

Problem

The Standalone Smoketest CI job started failing on every PR with:

failed to prepare bundled Node.js runtime: "bundled Node.js 22.23.0 does not match
the package.json devEngines.runtime.version pin 22.22.3. ..."

The smoketest runs cargo check in standalone/src-tauri, which executes build.rs. That script resolves Node via node -p process.execPath (the PATH node) and fails the build unless its version exactly equals package.json's devEngines.runtime.version pin (22.22.3).

The job set up Node with a bare node-version: 22, which tracks whatever 22.x the GitHub runner image happens to ship. The runner's 22.x line recently advanced from 22.22.3 to 22.23.0, so the exact-match check in build.rs began failing — even though the pin itself never changed. This is environmental drift, not a code regression, and it affects every PR and main push that runs the smoketest.

Fix

Drive setup-node from the pin instead of a bare major version, so the exact pinned Node is provisioned regardless of the runner default. This mirrors the existing build-standalone job in release.yml, which already reads devEngines.runtime.version via jq and feeds it to setup-node — and matches the contract build.rs documents ("CI reads the same field to drive actions/setup-node").

Only the standalone-smoketest job needs this: it is the one that runs cargo check directly. The build-and-test job runs everything through pnpm, where devEngines (onFail: "download") already provisions the pinned Node for scripts.

Testing

No unit test is feasible for a CI workflow change — the verification is the Standalone Smoketest check on this PR going green, which exercises the exact path that is currently red on other open PRs. With the pin-driven setup-node, the runner installs 22.22.3 and build.rs's version check passes.

This is intentionally not a pin bump (22.22.3 → 22.23.0): the disclosed runtime version is a supply-chain-controlled value that should advance through the maturity-window dependency path, not a CI convenience edit.

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