The ornamental design for a wrist-worn smart electronic device, as shown and described.
FIG. 1 is a front view of a wrist-worn smart electronic device showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a right view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective view thereof.
The broken lines shown of a band illustrate the environment. The remainder of the broken lines illustrate portions of the wrist-worn smart electronic device. The broken lines form no part of the claimed design.