feat(users): add drag-and-drop reordering for PICs

Introduce pic_sort_order to persist custom user ordering
Replace data table with a custom draggable grid layout
Add API endpoint to handle bulk order updates

server/utils/users.ts

@@ -73,3 +73,19 @@ export function parseUserProfileInput(body: {
     role
   }
 }
+
+export function parseUserOrderInput(body: {
+  userIds?: unknown
+}) {
+  assertBadRequest(Array.isArray(body.userIds), 'User ids must be an array')
+  assertBadRequest(body.userIds.every((value) => typeof value === 'string' && value.trim()), 'Every user id is required')
+
+  const userIds = body.userIds.map((value) => value.trim())
+  const uniqueUserIds = new Set(userIds)
+
+  assertBadRequest(uniqueUserIds.size === userIds.length, 'User ids must be unique')
+
+  return {
+    userIds
+  }
+}