diff --git a/__mocks__/next/navigation.ts b/__mocks__/next/navigation.ts
new file mode 100644
index 0000000..2363915
--- /dev/null
+++ b/__mocks__/next/navigation.ts
@@ -0,0 +1,109 @@
+/**
+ * Dublê central e completo de `next/navigation` para o Jest (jest.config.ts: moduleNameMapper). Todo teste que importa
+ * o módulo, direta ou indiretamente (HoverPrefetchLink, Header, páginas com `notFound`), recebe este arquivo: nenhum
+ * teste precisa montar um `jest.mock("next/navigation", ...)` parcial, e nenhum componente vê o módulo sem um export.
+ *
+ * Estado: `usePathname`, `useSearchParams`, `useParams` e `useSelectedLayoutSegment(s)` leem `navigationState`.
+ * Troque-o com `setNavigation({ pathname: "/cases" })` (ou `jest.mocked(usePathname).mockReturnValue("/cases")`) e
+ * volte ao padrão ("/", sem parâmetros) com `resetNavigation()` num `beforeEach`.
+ * Erros: `notFound` e `redirect` lançam como os do Next (com `digest`), e `notFound` lança com a mensagem
+ * "NEXT_NOT_FOUND", que os testes das páginas conferem.
+ */
+
+type Params = Record<string, string | string[]>;
+
+interface NavigationState {
+  pathname: string | null;
+  searchParams: URLSearchParams;
+  params: Params;
+  segments: string[];
+}
+
+const initialState = (): NavigationState => ({
+  pathname: "/",
+  searchParams: new URLSearchParams(),
+  params: {},
+  segments: [],
+});
+
+export const navigationState: NavigationState = initialState();
+
+/** Cada `jest.fn` com a implementação padrão, para o `resetNavigation` devolvê-la depois de um `mockReset`. */
+const defaults: Array<[jest.Mock, (...args: never[]) => unknown]> = [];
+function mockFn<Args extends unknown[], Result>(
+  implementation: (...args: Args) => Result,
+) {
+  const fn = jest.fn(implementation);
+  defaults.push([fn as jest.Mock, implementation as never]);
+  return fn;
+}
+
+export function setNavigation(
+  next: Partial<Omit<NavigationState, "searchParams">> & {
+    searchParams?: string | URLSearchParams;
+  },
+) {
+  const { searchParams, ...rest } = next;
+  Object.assign(navigationState, rest);
+  if (searchParams !== undefined)
+    navigationState.searchParams = new URLSearchParams(searchParams);
+}
+
+export function resetNavigation() {
+  Object.assign(navigationState, initialState());
+  for (const [fn, implementation] of defaults) {
+    fn.mockReset();
+    fn.mockImplementation(implementation);
+  }
+}
+
+export const router = {
+  push: mockFn(() => undefined),
+  replace: mockFn(() => undefined),
+  back: mockFn(() => undefined),
+  forward: mockFn(() => undefined),
+  refresh: mockFn(() => undefined),
+  prefetch: mockFn(() => undefined),
+};
+
+export const usePathname = mockFn(() => navigationState.pathname);
+export const useRouter = mockFn(() => router);
+export const useSearchParams = mockFn(() => navigationState.searchParams);
+export const useParams = mockFn(() => navigationState.params);
+export const useSelectedLayoutSegments = mockFn(() => navigationState.segments);
+export const useSelectedLayoutSegment = mockFn(
+  () => navigationState.segments[0] ?? null,
+);
+export const useServerInsertedHTML = mockFn(() => undefined);
+export const unstable_isUnrecognizedActionError = mockFn(() => false);
+export const unstable_rethrow = mockFn((error: unknown): void => {
+  throw error;
+});
+
+export const RedirectType = { push: "push", replace: "replace" } as const;
+export const ReadonlyURLSearchParams = URLSearchParams;
+
+/** Erro com `digest`, como os que o Next lança para interromper a renderização. */
+function nextError(message: string, digest: string): never {
+  throw Object.assign(new Error(message), { digest });
+}
+
+export const notFound = mockFn((): never => {
+  return nextError("NEXT_NOT_FOUND", "NEXT_HTTP_ERROR_FALLBACK;404");
+});
+export const forbidden = mockFn((): never => {
+  return nextError("NEXT_FORBIDDEN", "NEXT_HTTP_ERROR_FALLBACK;403");
+});
+export const unauthorized = mockFn((): never => {
+  return nextError("NEXT_UNAUTHORIZED", "NEXT_HTTP_ERROR_FALLBACK;401");
+});
+export const redirect = mockFn(
+  (url: string, type: "push" | "replace" = "replace"): never => {
+    return nextError("NEXT_REDIRECT", `NEXT_REDIRECT;${type};${url};307;`);
+  },
+);
+export const permanentRedirect = mockFn(
+  (url: string, type: "push" | "replace" = "replace"): never => {
+    return nextError("NEXT_REDIRECT", `NEXT_REDIRECT;${type};${url};308;`);
+  },
+);
diff --git a/jest.config.ts b/jest.config.ts
index 85189f0..3d3ce2f 100644
--- a/jest.config.ts
+++ b/jest.config.ts
@@ -12,6 +12,8 @@ const config: Config = {
     "^@/(.*)$": "<rootDir>/$1",
     "^.+\\.(css|sass|scss)$": "identity-obj-proxy",
     "^server-only$": "<rootDir>/lib/__mocks__/server-only.ts",
+    // dublê completo e central: nenhum teste monta um mock parcial de next/navigation
+    "^next/navigation$": "<rootDir>/__mocks__/next/navigation.ts",
   },
   testMatch: ["**/__tests__/**/*.[jt]s?(x)", "**/?(*.)+(spec|test).[jt]s?(x)"],
   transform: {