Fixes: 1) Remove obsolete `reboot` scripts for Unix and Windows to prevent redundancy; 2) Update Windows `test.ps1` to handle omitted coverage patterns and improve error feedback.
Extra: 1) Refactor Windows scripts (`make-messages.ps1`, `compile-messages.ps1`, `backup.ps1`) to use shared utilities for better consistency and output formatting; 2) Add spinner-based progress indicators to enhance user experience in interactive environments.
