feat(status): make the set-status menu work

feat(user): optimise get() function for react
qol(todos): update todos

packages/user/src/selection.ts

@@ -0,0 +1,40 @@
+import type { User, UserField, UserFields, SelectedUser } from "./context";
+
+const USER_FIELD_MAP = {
+  About: true,
+  Avatar: true,
+  Display: true,
+  IotaId: true,
+  OmikronConnections: true,
+  OmikronId: true,
+  OnlineStatus: true,
+  PublicKey: true,
+  Status: true,
+  SubEnd: true,
+  SubLevel: true,
+  UserId: true,
+  Username: true,
+} satisfies Record<UserField, true>;
+
+const USER_FIELDS = Object.keys(USER_FIELD_MAP) as UserField[];
+
+export function selectUserFields<const Fields extends UserFields>(
+  user: User,
+  fields: Fields,
+): SelectedUser<Fields> {
+  return Object.fromEntries(
+    fields.map((field) => [field, user[field]]),
+  ) as SelectedUser<Fields>;
+}
+
+export function getChangedUserFields(
+  previous: User | undefined,
+  next: User | undefined,
+): UserField[] {
+  if ((previous === undefined) !== (next === undefined)) {
+    return [...USER_FIELDS];
+  }
+  return USER_FIELDS.filter(
+    (field) => !Object.is(previous?.[field], next?.[field]),
+  );
+}