Truncate long Aliki site titles in the desktop header

On desktop, a long --title overflowed the brand column and ran under
the search field. Clip it to its column with an ellipsis, as the mobile
header already did.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gxq9jGyjWoANhMZXRtssiu

Author: claude

lib/rdoc/generator/template/aliki/css/rdoc.css

@@ -468,6 +468,9 @@ header.top-navbar .navbar-brand {
   font-weight: var(--font-weight-semibold);
   color: var(--color-text-primary);
   text-decoration: none;
+  max-width: calc(100% - var(--space-6));
+  overflow: hidden;
+  text-overflow: ellipsis;
   white-space: nowrap;
 }
 
@@ -597,9 +600,6 @@ header.top-navbar .navbar-search form {
     margin-left: 2.5rem;
     flex: 1;
     font-size: var(--font-size-lg);
-    overflow: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
   }
 
   .theme-toggle {