fix(dashboard): sort recent activity by updated_at so delivered/received cards also appear

app/routers/web.py

@@ -595,8 +595,8 @@ def dashboard(request: Request, user: User = Depends(get_current_user_web), db:
     received = sum(1 for c in all_cards if c.status == "received")
     countries = len({c.country for c in all_cards if c.country})
 
-    # recent postcards across all profiles (last 8)
-    all_cards.sort(key=lambda c: c.created_at, reverse=True)
+    # recent postcards across all profiles (last 8), sorted by most recently updated
+    all_cards.sort(key=lambda c: c.updated_at or c.created_at, reverse=True)
     recent = all_cards[:8]
 
     # status distribution for progress bar