style: add required Koenig editor classes for Ghost content

assets/css/tailwind.css

@@ -200,6 +200,30 @@
   }
 }
 
+/* Koenig Editor (Ghost) required classes */
+@utility kg-width-wide {
+  position: relative;
+  width: 85vw;
+  left: 50%;
+  transform: translateX(-50%);
+  max-width: 1200px;
+}
+
+@utility kg-width-full {
+  position: relative;
+  width: 100vw;
+  left: 50%;
+  transform: translateX(-50%);
+}
+
+@utility kg-card {
+  @apply mb-8;
+}
+
+@utility kg-card-caption {
+  @apply text-center text-sm text-[var(--text-secondary)] mt-2;
+}
+
 .site-logo {
   @apply transition-all duration-300;
   color: var(--brand-primary);