chore(tools): suppress Node.js warnings in snap tests for stable output (#1070)

Add `NODE_NO_WARNINGS=1` to the snap test environment to suppress
Node.js runtime warnings (e.g. `MODULE_TYPELESS_PACKAGE_JSON`) that vary
across Node.js versions.

## Why?

Without this, developers using a different Node.js version than the one
pinned in `.node-version` (22.18.0) will see warnings in stderr that get
captured into snap output, causing false diffs unrelated to actual code
changes.

Co-authored-by: MK (fengmk2) <fengmk2@gmail.com>

Author: kazupon

packages/tools/src/snap-test.ts

@@ -245,6 +245,9 @@ async function runTestCase(name: string, tempTmpDir: string, casesDir: string, b
     // Indicate CLI is running in test mode, so that it prints more detailed outputs.
     // Also disables tips for stable snapshots.
     VITE_PLUS_CLI_TEST: '1',
+    // Suppress Node.js runtime warnings (e.g. MODULE_TYPELESS_PACKAGE_JSON)
+    // to keep snap outputs stable across Node.js versions.
+    NODE_NO_WARNINGS: '1',
     NO_COLOR: 'true',
     // set CI=true make sure snap-tests are stable on GitHub Actions
     CI: 'true',