[JS] Bump NPM package version up to 2026.1 (openvinotoolkit#3470)

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## Description
Update the NPM package to version 2026.1.

<!-- Jira ticket number (e.g., 123). Delete if there's no ticket. -->
CVS-182504

## Checklist:
- [x] This PR follows [GenAI Contributing
guidelines](https://github.com/openvinotoolkit/openvino.genai?tab=contributing-ov-file#contributing).
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- [ ] Tests have been updated or added to cover the new code. <!--
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- [ ] I have made corresponding changes to the documentation. <!-- Run
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Signed-off-by: Kirill Suvorov <kirill.suvorov@intel.com>

Author: Retribution98

samples/js/package-lock.json

@@ -4,7 +4,7 @@
   "license": "Apache-2.0",
   "type": "module",
   "devDependencies": {
-    "openvino-genai-node": "^2025.4.0",
+    "openvino-genai-node": "^2026.1.0",
     "yargs": "^18.0.0",
     "zod": "^4.1.13"
   },

samples/js/package.json

@@ -4,6 +4,8 @@ lib
 src
 tests
 thirdparty
+ov_cache
+test.env
 
 CMakeLists.txt
 eslint.config.cjs