feat: Add user-friendly error handling for failed API queries

[gauravm03]

This PR improves the CLI's robustness by handling errors that occur during the issue fetching process.

Changes

• Wrapped the main execution logic in a try...catch block to prevent unhandled promise rejections.
• Added user-friendly error logging using chalk.red when an exception occurs (e.g., invalid project name or network connectivity issues).
• Implemented process.exitCode = 1 for error states to ensure proper shell exit codes.
• Added a graceful check for when no issues are found, ensuring the user sees a helpful message instead of a silent failure.