auto-version

[dben]

This pull request updates the build workflow and dependencies to improve automation, compatibility, and maintainability. The main changes include expanding workflow triggers, updating environment variable logic, upgrading dependencies, and making the build process more robust.

Workflow improvements:

• The build.yml workflow now triggers on pushes to the main branch (in addition to pull requests and manual dispatch), and uses dist/** for path ignores to cover all files in the dist directory.
• Environment variables in the workflow are now set with more explicit logic, providing sensible defaults for bump and dry_run based on the event type.
• The workflow uses Node.js 26 instead of 20, and the actions/checkout action is updated to a specific commit for improved reproducibility.

Dependency updates:

• All core dependencies (@actions/core, @actions/github, semver) and dev dependencies (@vercel/ncc, dotenv) are updated to their latest versions for better security and compatibility.

Code and configuration robustness:

• The commit message parsing in main.js now uses optional chaining for improved safety.
• The workflow step for configuring the git user email now uses the ${GITHUB_ACTOR} environment variable for consistency.
• The workflow always passes the dry_run environment variable and enables detect_bump for more predictable and explicit behavior.