Follow the OS dark mode with a softer, readable palette

Elternbeirat.Web/Features/Posts/PostDetail.razor.css

@@ -8,6 +8,6 @@
 
 .post-meta time {
     display: block;
-    color: #777;
+    color: var(--color-text-soft);   /* token, so it adapts in dark mode */
     font-size: 0.85rem;
 }