feat: staging build

[DIYgod]

Description

PR Type

• [ ] Feature
• [ ] Bugfix
• [ ] Hotfix
• [ ] Other (please describe):

Screenshots (if UI change)

Demo Video (if new feature)

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Additional context

Changelog

• [ ] I have updated the changelog/next.md with my changes.

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Suggested PR Title:

fix: improve build process and add environment icons

Change Summary: This PR enhances the GitHub Actions build process by introducing a new environment variable for staging and modifying the conditional checks throughout the build steps. It also updates the package.json scripts for better organization and includes new environment-specific icons to improve user experience and clarity when switching between environments. Several code components have been optimized to utilize a new env constant, DEV, for determining the running mode, reducing reliance on direct environment checks.

Code Review: No change requests necessary.