Publish Common to NPM

[jadeallencook]

We need to prepare and publish our shared component library as an NPM package under the scope @techletariats/common. The goal is to provide a clean, typed, and consumable build that developers can easily install, import, and use in other projects. The package should include type declarations, proper entry points, and peer dependencies for React.

• @techletariats/common is published on NPM and installable.
• Consumers can import and render components successfully.
• CI workflow automates build and publish on tagged releases.
• README clearly documents setup, usage, and contribution guidelines.