feat(servicos): ofertas no topo de /servicos, capa por assunto e diagramas

/servicos abre com as 3 ofertas e depois outros serviços; H1 de criação de sites e de engenharia com o nome da oferta; capa de cada serviço pelo assunto (SEV fora do próprio case cai de ~11 para 2 imagens); diagrama de fluxo em SVG nos serviços sem case; cases com o que o cliente passou a poder fazer e contato logo depois de Como ficou; FAQ num componente só; lastmod por rota; ProfessionalService com areaServed.

app/servicos/_components/ServiceOfferCards.paths.test.tsx

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+import { render, screen, within } from "@testing-library/react";
+import { caseStudies, type ServiceOffer } from "@/lib/site-content";
+import { ServiceOfferCards } from "./ServiceOfferCards";
+
+/**
+ * Testes de caminhos-base de ServiceOfferCards / OfferCard (CC 4): id de case que existe | que não existe (ignorado);
+ * com cases | sem cases (a lista de links some); com observação | sem observação.
+ */
+
+jest.mock("next/navigation", () => ({ usePathname: () => "/servicos" }));
+
+function offer(overrides: Partial<ServiceOffer["proof"]>): ServiceOffer {
+  return {
+    id: "site",
+    name: "Oferta de teste",
+    summary: "Resumo.",
+    href: "/servicos/criacao-de-sites",
+    deliverables: ["Um", "Dois", "Três"],
+    proof: { label: "Veja funcionando", caseIds: [], ...overrides },
+  };
+}
+
+const card = () => screen.getByRole("article");
+
+describe("ServiceOfferCards", () => {
+  it("path: cases that exist and a note -> a link per case in the order given, then the note", () => {
+    render(
+      <ServiceOfferCards
+        offers={[
+          offer({ caseIds: ["sev-modaintima", "lavacao-047"], note: "Nota." }),
+        ]}
+      />,
+    );
+
+    const links = within(card()).getAllByRole("link", { name: /^Ver case / });
+    expect(links.map((link) => link.getAttribute("href"))).toEqual([
+      "/cases/sev-modaintima",
+      "/cases/lavacao-047",
+    ]);
+    expect(within(card()).getByText("Nota.")).toBeVisible();
+  });
+
+  it("path: an id with no case behind it -> skipped, the real cases around it stay", () => {
+    render(
+      <ServiceOfferCards
+        offers={[
+          offer({ caseIds: ["nao-existe", "lavacao-047", "tambem-nao"] }),
+        ]}
+      />,
+    );
+
+    const links = within(card()).getAllByRole("link", { name: /^Ver case / });
+    expect(links.map((link) => link.getAttribute("href"))).toEqual([
+      "/cases/lavacao-047",
+    ]);
+  });
+
+  it("path: only ids with no case -> no list of cases at all, the label and the service link stay", () => {
+    render(<ServiceOfferCards offers={[offer({ caseIds: ["nao-existe"] })]} />);
+
+    expect(
+      within(card()).queryAllByRole("link", { name: /^Ver case / }),
+    ).toEqual([]);
+    expect(within(card()).queryAllByRole("listitem")).toHaveLength(3);
+    expect(within(card()).getByText("Veja funcionando")).toBeVisible();
+    expect(
+      within(card()).getByRole("link", { name: /Ver o serviço|Ver serviço/ }),
+    ).toHaveAttribute("href", "/servicos/criacao-de-sites");
+  });
+
+  it("path: no cases and a note (the review offer) -> only the note under the label", () => {
+    render(
+      <ServiceOfferCards
+        offers={[
+          offer({
+            caseIds: [],
+            label: "Veja como funciona",
+            note: "A página mostra o que você recebe.",
+          }),
+        ]}
+      />,
+    );
+
+    expect(within(card()).getByText("Veja como funciona")).toBeVisible();
+    expect(
+      within(card()).getByText("A página mostra o que você recebe."),
+    ).toBeVisible();
+    expect(
+      within(card()).queryAllByRole("link", { name: /^Ver case / }),
+    ).toEqual([]);
+  });
+
+  it("path: cases and no note -> no empty paragraph for the note", () => {
+    const { container } = render(
+      <ServiceOfferCards offers={[offer({ caseIds: ["lavacao-047"] })]} />,
+    );
+
+    expect(container.querySelectorAll("article p")).toHaveLength(2);
+  });
+
+  it("path: every real case id of the real offers resolves to a case (no silently dropped proof)", () => {
+    const { serviceOffers } =
+      jest.requireActual<typeof import("@/lib/site-content")>(
+        "@/lib/site-content",
+      );
+    const known = new Set(caseStudies.map(({ id }) => id));
+
+    for (const { proof } of serviceOffers)
+      for (const id of proof.caseIds) expect(known.has(id)).toBe(true);
+  });
+});