fixed ss3 escape code parsing, added a cursor mode reset that triggers on child exit

src/libsh/sys.rs

@@ -9,7 +9,8 @@ pub static TTY_FILENO: LazyLock<RawFd> = LazyLock::new(|| {
   let fd = open("/dev/tty", OFlag::O_RDWR, Mode::empty()).expect("Failed to open /dev/tty");
   // Move the tty fd above the user-accessible range so that
   // `exec 3>&-` and friends don't collide with shell internals.
-  let high = fcntl(fd, FcntlArg::F_DUPFD_CLOEXEC(MIN_INTERNAL_FD)).expect("Failed to dup /dev/tty high");
+  let high =
+    fcntl(fd, FcntlArg::F_DUPFD_CLOEXEC(MIN_INTERNAL_FD)).expect("Failed to dup /dev/tty high");
   close(fd).ok();
   high
 });