feat: add application productivity foundations

packages/reactive/test/form.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "bun:test";
+import { useForm } from "../src/index.ts";
+
+test("form state binds fields, validates, submits and resets", async () => {
+  const form = useForm({ name: "", active: false }, (value) => ({
+    name: value.name ? undefined : "Required",
+  }));
+  form.field("name").onInput({ value: "Ada" });
+  form.field("active").onInput({ checked: true });
+  expect(form.dirty.get()).toBe(true);
+  expect(await form.submit(async (value) => value.name)).toBe("Ada");
+  form.reset();
+  expect(form.values.get()).toEqual({ name: "", active: false });
+});