style: re-add unified focus style

Author: essenmitsosse

app/assets/main.css

@@ -181,6 +181,12 @@ body {
   line-height: 1.6;
 }
 
+*:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 2px;
+  border-radius: 2px;
+}
+
 /* Reset dd margin (browser default is margin-left: 40px) */
 dd {
   margin: 0;