feat(patterns): add full-width public CTA box

styles/45-patterns-public-page-patterns.css

@@ -29,6 +29,10 @@
   color: var(--color-font-dark);
 }
 
+.sg-public-page-pattern-call-to-action-box--full-width {
+  width: 100%;
+}
+
 .sg-public-page-pattern-call-to-action-box__action {
   display: flex;
 }
@@ -37,6 +41,10 @@
   width: 100%;
 }
 
+.sg-public-page-pattern-call-to-action-box__action .sg-button--process {
+  width: 100%;
+}
+
 .sg-public-page-pattern-text-and-picture-right {
   --layout-public-page-pattern-text-picture-columns: repeat(2, minmax(0, 1fr));
   --layout-public-page-pattern-text-picture-gap: var(--spacing-large);