feat(component/app): improve and fix terminal state restoration and s…#1277
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…ignal handling - Replaced std::signal with POSIX sigaction on non-Windows platforms. - Avoided double-restoration of the terminal configuration by implementing atomic g_terminal_is_raw state tracking. - Added support for additional crash (SIGBUS, SIGSYS) and termination (SIGQUIT, SIGHUP) signals. - Fixed async-signal-safety issues in crash handlers by writing directly to STDOUT_FILENO and bypassing stream buffers. - Realigned Event::CtrlC to SIGINT for proper graceful uninstallation flow. - Added comprehensive unit tests for all registered signals.
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…ignal handling