Exec Vulnerability

How Command Injection Happens in Node.js child_process and How to Fix It

A high-severity command injection vulnerability was discovered in `server.js` where user-controlled file paths were passed directly to shell commands via `exec()`. By migrating from `exec()` to `execFile()` and using argument arrays instead of string concatenation, the fix eliminates the attack surface while preserving the intended trash/delete functionality across macOS, Windows, and Linux.