fix: recolour original theme to a cream field with blue text

Use a cream/white background with navy message text and red buttons, so the
original red/white/blue livery presents blue text rather than white text on a
blue field.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

styles.css

@@ -19,16 +19,16 @@
   --button-active-text: #ffffff;
 }
 
-/* Original DLR — 1987 red and blue */
+/* Original DLR — 1987 red, white and blue */
 [data-theme="original"] {
-  --bg: #002b5c;
-  --surface: #f5f0e1;
-  --text: #f5f0e1;
-  --message: #f5f0e1;
+  --bg: #f5f0e1;
+  --surface: #002b5c;
+  --text: #002b5c;
+  --message: #002b5c;
   --button-bg: #c8102e;
   --button-text: #f5f0e1;
-  --button-active-bg: #f5f0e1;
-  --button-active-text: #002b5c;
+  --button-active-bg: #002b5c;
+  --button-active-text: #f5f0e1;
 }
 
 * {