Bug: Dev server fails with unclear error when environment variables are missing #2901
Description
Describe the bug
When running the project locally, the dev server can fail if required environment variables are missing or misconfigured. The error message does not clearly explain which variable is missing or how to fix the issue, which makes setup harder than necessary
Steps
Clone the repository, install dependencies, and start the dev server without fully configured environment variables.
The server fails with an unclear or generic error.
Expected behavior
The dev server should clearly report which environment variable is missing or invalid and explain how to resolve the issue.
Additional info
No response
Environment
Tested on macOS with Node.js LTS using npm during local development