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

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

packages/user/src/selection.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+
+import type { User } from "./context";
+import { getChangedUserFields, selectUserFields } from "./selection";
+
+const user = {
+  Avatar: undefined,
+  Display: "Alice",
+  IotaId: 1,
+  OmikronConnections: [],
+  OnlineStatus: "user_online",
+  PublicKey: "AA==",
+  SubEnd: 0,
+  SubLevel: 0,
+  UserId: 1,
+  Username: "alice",
+} satisfies User;
+
+describe("presence selection", () => {
+  it("notifies OnlineStatus selections when presence changes", () => {
+    const next = { ...user, OnlineStatus: "user_dnd" as const };
+
+    expect(getChangedUserFields(user, next)).toEqual(["OnlineStatus"]);
+    expect(selectUserFields(next, ["OnlineStatus"])).toEqual({
+      OnlineStatus: "user_dnd",
+    });
+  });
+});