Add user permission checks for series editing and enhance author display method

atlas/models.py

@@ -1047,6 +1047,27 @@ class Series(SeriesBase):
             return self.description
         else:
             return f"{self.examination} ({self.plane})"
+    
+    def user_can_edit(self, user, allow_if_can_edit_cases=True) -> bool:
+        """Check if the user can edit the series.
+
+        Args:
+            user (User): The user to check.
+        Returns:
+            bool: True if the user can edit the series, False otherwise.
+        """
+        if user.is_superuser:
+            return True
+
+        if self.author.filter(id=user.id).exists():
+            return True
+
+        if allow_if_can_edit_cases:
+            # Check if user can edit any of the cases this series is in
+            for case in self.case.all():
+                if case.check_user_can_edit(user):
+                    return True
+        return False
 
     def get_full_str(self):
         if self.case: