fix(fab): add missing icon properties for print FAB

Added display, width, height, background:currentColor, and full
mask-size/mask-repeat/mask-position properties to match the
original fab-primary__ico pattern.

public/css/main.css

@@ -962,8 +962,18 @@ a.fab--secondary:visited {
 
 /* ── Print FAB ── */
 .fab-secondary__ico--print {
+  display: block;
+  width: var(--icon-fab);
+  height: var(--icon-fab);
+  background: currentColor;
   mask-image: url("../assets/shared/icons/printer.svg");
   -webkit-mask-image: url("../assets/shared/icons/printer.svg");
+  mask-size: contain;
+  mask-repeat: no-repeat;
+  mask-position: center;
+  -webkit-mask-size: contain;
+  -webkit-mask-repeat: no-repeat;
+  -webkit-mask-position: center;
 }
 
 .fab--label {