Fix get_activities call to use get_activities_paginated

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/routers/users.py

@@ -141,7 +141,7 @@ async def home(request: Request):
     username = get_user_from_cookie(request)
 
     # Get recent activities
-    activities = await db.get_activities(limit=10)
+    activities, _ = await db.get_activities_paginated(limit=10)
 
     # Get README if exists
     readme_html = ""