Add explicit theme color to ContentCard title for consistent theming across all pages

src/app/globals.css

@@ -609,6 +609,7 @@ tbody tr:hover {
   font-weight: 700;
   font-size: 1rem;
   line-height: 1.3;
+  color: var(--color-text);
 }
 .content-card-subtitle {
   margin: 0.15rem 0 0;