feat: user edit UI + admin UI improvements + fixes

client/graph/admin/users/users-query-list.gql

@@ -5,6 +5,7 @@ query {
       name
       email
       providerKey
+      isSystem
       createdAt
     }
   }

client/graph/admin/users/users-query-single.gql

@@ -0,0 +1,21 @@
+query ($id: Int!) {
+  users {
+    single(id: $id) {
+      id
+      name
+      email
+      providerKey
+      providerId
+      location
+      jobTitle
+      timezone
+      isSystem
+      createdAt
+      updatedAt
+      groups {
+        id
+        name
+      }
+    }
+  }
+}