Form

pub fn buildForm(scope: *ui.Scope, cx: *ui.Cx) anyerror!*ui.Node {
    const a = cx.allocator;
    const c = try col(cx, 12);
    _ = try ui.widgets.FormOf(DemoForm).create(scope, .{ .name = "", .email = "" }, .{ .trigger = .on_blur });
    // 表单字段 UI 用 Input 展示（FormOf 管校验状态；此 story 重在展示字段布局）
    try c.appendChild(a, try W.Input(.{ .label_text = "Name", .placeholder = "Full name", .width = 320, .required = true }).mount(scope, cx));
    try c.appendChild(a, try W.Input(.{ .label_text = "Email", .input_type = .email, .placeholder = "you@example.com", .width = 320, .required = true }).mount(scope, cx));
    try c.appendChild(a, try W.Button(.{ .label = "Submit", .variant = .primary }).mount(scope, cx));
    return c;
}