Improve Error Handling and Dependency Validation

[Khushi06-Code]

Problem

Currently, the interactive script does not clearly validate whether required dependencies
like arduino-cli, gum, and timer are properly installed and accessible in PATH.

If any dependency is missing or misconfigured, the script may fail silently or show
unclear error messages, making debugging difficult for users.

Expected Behavior

• The script should check for required dependencies at startup.
• If a dependency is missing, it should exit with a clear and user-friendly error message.
• When an internal arduino-cli command fails, the full error output should be displayed.

Why This Matters

Clear dependency validation improves user experience and prevents confusion,
especially for first-time users setting up the tool.

I would like to work on improving dependency checks and structured error handling.

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊

[Khushi06-Code]

I would like to work on this issue. Please assign it to me @Vaishnav-Sabari-Girish

[Vaishnav-Sabari-Girish]

Ok @Khushi06-Code . This issue will be assigned to you. Thank you for your interest