Gitea-Repo fix

frontend/js/calendar.js

@@ -868,7 +868,7 @@ class CalendarViewManager {
     if (task.assignees && task.assignees.length > 0) {
       task.assignees.forEach(assignee => {
         const currentUser = users.find(u => u.id === assignee.id);
-        const initials = currentUser?.username || assignee.username || '??';
+        const initials = currentUser?.initials || assignee.initials || '??';
         const color = currentUser?.color || assignee.color || '#6B7280';
         badges.push({ initials, color });
       });
@@ -879,7 +879,7 @@ class CalendarViewManager {
     if (task.assignedTo) {
       const user = users.find(u => u.id === task.assignedTo);
       if (user) {
-        const initials = user.username || '??';
+        const initials = user.initials || '??';
         badges.push({ initials, color: user.color || '#6B7280' });
         return badges;
       }