chore: add tag-based npm publish workflow

[Tnalxmsk]

Summary

Add a tag-based GitHub Actions workflow to publish to npm when a version tag is pushed.

Related Issues

• Closes chore: add tag-based npm publish workflow #14

Changes

• Add .github/workflows/publish.yml triggered on v*.*.* tags
• Publish using NPM_TOKEN secret via npm publish

How To Test

1. (Optional) Push a test tag like v0.0.1 in a sandbox repo to verify publish flow
2. Confirm the Publish workflow runs on tag push

Checklist

• Title follows the convention (e.g., feat: add global audio seek guard)
• Build passes locally (pnpm build)
• No breaking changes, or they are documented below
• Tests added/updated where appropriate
• Docs/comments updated where helpful

Breaking Changes (if any)

None.

Notes For Reviewers

• Requires NPM_TOKEN secret in GitHub Actions to publish successfully.

Screenshots / Recordings (if UI changes)

N/A