The ornamental design for a headboard and canopyunit, as shown and described.
FIG. 1 is a front perspective view of a headboard and canopy unit showing
my new design, the broken lines shown throughout are for illustrating
environmental elements, only;
FIG. 2 is a front elevational view of FIG. 1;
FIG. 3 is a side elevational view thereof; the opposite side elevational
view being a mirror image;