[Fix] Increment prerelease from npm publish tag

[jsaarimaa]

Summary

Fix prerelease publishing for development and test environments.

The version helper previously looked up npm dist-tags using prerelease identifiers (d/t), while packages are published under dev/test. This caused the helper to repeatedly generate versions such as 0.2.3-d.0.

The workflow now passes the actual npm tag to the helper, allowing it to detect the existing prerelease and increment it to 0.2.3-d.1.

Validation

Verified prerelease increment from 0.2.3-d.0 to 0.2.3-d.1
1,144 tests passed
Lint passed
Production build passed

[Copilot]

🟢 Approval recommended

No blocking issues were identified, and validation passed.

Pull request overview

Fixes prerelease version increments by using the actual npm dist-tag (dev/test) when locating existing versions.

Changes:

• Passes the npm tag to the version helper.
• Uses NPM_TAG for prerelease lookup and incrementing.
• Improves missing-input validation.

File summaries

File	Description
.github/workflows/cd-publish.yml	Passes the npm tag to the helper.
.github/scripts/version-helper.js	Uses the npm tag to resolve prerelease versions.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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