fix: keep icon-only buttons at least one line tall

assets/styles/components/button.css

@@ -5,10 +5,13 @@
     @apply uppercase text-center text-sm/6 md:text-base/6;
     @apply transition-colors outline-none focus:outline-2 focus:outline-offset-2 focus:outline-primary-dark;
     @apply rounded-md;
+    /* At least one line tall even when the content is only a smaller icon: line + padding + border */
+    min-height: calc(1lh + 2 * theme('spacing.2') + 2px);
 }
 
 .button--small {
     @apply px-2 py-1 md:px-4 text-xs/6 sm:text-sm/6;
+    min-height: calc(1lh + 2 * theme('spacing.1') + 2px);
 }
 
 .button--primary {