fix: add dark to LMText textColorMap, match config default

src/blocks/LMTextBlock/Component.tsx

@@ -24,6 +24,11 @@ const maxWidthMap: Record<string, string> = {
 
 // Navy text color = adapts to dark mode. White/yellow = always explicit.
 const textColorMap: Record<string, { h1: string; h2: string; body: string }> = {
+  dark:   {
+    h1:   'text-fd-navy dark:text-fd-yellow',
+    h2:   'text-fd-navy dark:text-fd-yellow',
+    body: 'text-fd-navy dark:text-white',
+  },
   navy:   {
     h1:   'text-fd-navy dark:text-fd-yellow',
     h2:   'text-fd-navy dark:text-fd-yellow',
@@ -38,7 +43,7 @@ export const LMTextBlockComponent: React.FC<LMTextBlockProps> = ({
   subheading,
   body,
   alignment = 'left',
-  textColor = 'navy',
+  textColor = 'dark',
   sectionBackground = 'white',
   maxWidth = 'wide',
   anchorId,