Build script fails on Windows due to Unix-specific CI= syntax

[k-o-c-o]

Description

The current build script in each project's package.json uses Unix-style environment variable syntax:

"build": "CI= react-scripts build"

This works on Unix-based systems, but fails on Windows (PowerShell/Command Prompt).

Steps to Reproduce

1. Clone the repository.
2. Navigate to any project's final directory.
3. Install dependencies:

npm install

4. Run:

npm run build

Expected Behavior

The project should build successfully.

Actual Behavior

The following error is displayed on Windows:

'CI' is not recognized as an internal or external command,
operable program or batch file.

Environment

• OS: Windows 11
• Shell: PowerShell

Use a cross-platform approach for setting environment variables, such as cross-env, or update the build script so it works on Windows, macOS, and Linux.