feat(home): prova no topo, contato sem atrito e conversão medida

Home mais curta (hero, vitrine de clientes, sobre, serviços, IA resumida, depoimentos e contato), faixa de clientes e telas reais no hero, sem números do GitHub. Barra de cookies fina, WhatsApp fixo no celular, formulário com e-mail opcional e alternativa por e-mail, página /ia, eventos de e-mail, redes e currículo e conversão do Ads opcional por variável. Rodapé em 3 colunas. Remove componentes órfãos (LighthouseMetrics, Skills, Experience, contagem do GitHub).

app/components/Testimonials.test.tsx

@@ -0,0 +1,48 @@
+import { render, screen } from "@testing-library/react";
+import type { Testimonial } from "@/lib/proof";
+import { testimonials } from "@/lib/proof";
+import Testimonials from "./Testimonials";
+
+const item: Testimonial = {
+  quote: "Entregou no prazo combinado.",
+  name: "Maria Souza",
+  role: "Sócia",
+  company: "Empresa de Teste",
+  projectId: "lavacao-047",
+};
+
+it("renders nothing without testimonials", () => {
+  const { container } = render(<Testimonials items={[]} />);
+  expect(container).toBeEmptyDOMElement();
+
+  const withoutProp = render(<Testimonials />);
+  expect(withoutProp.container).toBeEmptyDOMElement();
+});
+
+it("ships with no testimonial until a real, authorized one is added", () => {
+  expect(testimonials).toEqual([]);
+});
+
+it("shows the quote, who said it and a link to the case", () => {
+  render(<Testimonials items={[item]} />);
+
+  expect(
+    screen.getByRole("heading", { name: "O que dizem os clientes." }),
+  ).toBeInTheDocument();
+  expect(
+    screen.getByText("“Entregou no prazo combinado.”"),
+  ).toBeInTheDocument();
+  expect(screen.getByText("Maria Souza")).toBeInTheDocument();
+  expect(screen.getByText("Sócia, Empresa de Teste")).toBeInTheDocument();
+  expect(screen.getByRole("link", { name: "Ver o case" })).toHaveAttribute(
+    "href",
+    "/cases/lavacao-047",
+  );
+});
+
+it("falls back to initials without a photo and has no case link without a project", () => {
+  render(<Testimonials items={[{ ...item, projectId: undefined }]} />);
+
+  expect(screen.getByText("MS")).toBeInTheDocument();
+  expect(screen.queryByRole("link", { name: "Ver o case" })).toBeNull();
+});