Add GT badge to grouped sessions and sub-pages in session list

The GT badge was only shown on ungrouped SessionRow items. Now also
visible on document group rows (e.g. "GT 1/2") and individual pages
within expanded groups.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-lehrer/components/ocr-kombi/SessionList.tsx

@@ -150,9 +150,16 @@ function GroupRow({
             {group.page_count} Seiten
           </div>
         </div>
-        <span className="text-xs px-2 py-0.5 rounded-full bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 text-blue-600 dark:text-blue-400">
-          Dokument
-        </span>
+        <div className="flex items-center gap-1.5">
+          {group.sessions.some(s => s.is_ground_truth) && (
+            <span className="text-[10px] px-1.5 py-0.5 rounded-full bg-amber-100 dark:bg-amber-900/30 border border-amber-300 dark:border-amber-700 text-amber-700 dark:text-amber-300">
+              GT {group.sessions.filter(s => s.is_ground_truth).length}/{group.sessions.length}
+            </span>
+          )}
+          <span className="text-xs px-2 py-0.5 rounded-full bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 text-blue-600 dark:text-blue-400">
+            Dokument
+          </span>
+        </div>
       </div>
 
       {expanded && (
@@ -179,6 +186,9 @@ function GroupRow({
                 />
               </div>
               <span className="truncate flex-1">S. {s.page_number || '?'}</span>
+              {s.is_ground_truth && (
+                <span className="text-[9px] px-1 py-0.5 rounded bg-amber-100 dark:bg-amber-900/30 border border-amber-300 dark:border-amber-700 text-amber-700 dark:text-amber-300">GT</span>
+              )}
               <span className="text-[10px] text-gray-400">Step {s.current_step}</span>
               <button
                 onClick={(e) => {