feat(button): add user-select and min-size fallback (#804)

Author: petergoes

.changeset/poor-cats-fry.md

@@ -0,0 +1,2 @@
+---
+---

packages/components-css/button-css/src/_mixin.scss

@@ -12,8 +12,8 @@
   display: inline-flex;
   font-family: var(--nl-button-font-family);
   justify-content: center;
-  min-block-size: var(--nl-button-min-block-size);
-  min-inline-size: var(--nl-button-min-inline-size);
+  min-block-size: var(--nl-button-min-block-size, 44px);
+  min-inline-size: var(--nl-button-min-inline-size, 44px);
   outline-offset: var(--nl-button-outline-offset);
   overflow-wrap: break-word;
   padding-block-end: var(--nl-button-padding-block-end);
@@ -22,6 +22,8 @@
   padding-inline-start: var(--nl-button-padding-inline-start);
   text-align: start;
   text-box-trim: trim-both;
+  -webkit-user-select: none;
+  user-select: none;
 
   /*
    * Button has formatted content but no icon or label elements. The display