v3.1-alpha

Improvement
• Cancel and return-to-menu behavior:
Pressing Esc or Ctrl-C in the authentication dialog now cancels the password entry, exits with code 130, and returns the user directly to the main menu instead of showing an unauthorized warning. The implementation ensures the terminal is properly restored and no password data is written or transmitted.

Summary of Changes
This update enhances user control and safety during authentication by allowing clean cancellation and graceful return to the main interface without triggering security alerts or leaving terminal artifacts.