fix: restore terminal state after TUI exits

When invoked via curl|bash, huh/bubbletea TUI components could leave
the terminal in raw mode on exit, breaking echo and signal handling.
Save terminal state at startup and defer restore to guarantee cleanup.

Author: fullstackjam

cmd/openboot/main.go

@@ -4,9 +4,19 @@ import (
 	"os"
 
 	"github.com/openbootdotdev/openboot/internal/cli"
+	"golang.org/x/term"
 )
 
 func main() {
+	// Save terminal state before any TUI (huh/bubbletea) runs.
+	// Ensures the terminal is restored even if a TUI component crashes
+	// or exits without proper cleanup (e.g., when invoked via curl|bash).
+	if fd := int(os.Stdin.Fd()); term.IsTerminal(fd) {
+		if oldState, err := term.GetState(fd); err == nil {
+			defer term.Restore(fd, oldState)
+		}
+	}
+
 	if err := cli.Execute(); err != nil {
 		os.Exit(1)
 	}