feat: group people by role priority

apps/core/people.py

@@ -0,0 +1,25 @@
+from collections import OrderedDict
+
+
+ROLE_PRIORITY = {"lead": 0, "leader": 0, "organizer": 1, "collaborator": 2}
+ROLE_TITLES = {0: "Lead / Leader", 1: "Organizers", 2: "Collaborators"}
+
+
+def person_sort_key(person):
+    role = (person.role or "").strip().casefold()
+    return (ROLE_PRIORITY.get(role, 3), role if role not in ROLE_PRIORITY else "", person.order, person.pk or 0)
+
+
+def group_people(people):
+    groups = OrderedDict()
+    for person in sorted(people, key=person_sort_key):
+        role = (person.role or "").strip()
+        priority = ROLE_PRIORITY.get(role.casefold(), 3)
+        key = priority if priority < 3 else role.casefold()
+        if key not in groups:
+            groups[key] = {
+                "title": ROLE_TITLES[priority] if priority < 3 else role or "Other contributors",
+                "people": [],
+            }
+        groups[key]["people"].append(person)
+    return list(groups.values())