Revert "cookie handling"

This reverts commit ac9791c8ef.

src/services/management/__tests__/management-auth.test.ts

@@ -35,7 +35,6 @@ describe("Manager session cookie", () => {
       expect.any(String),
       expect.objectContaining({ secure: false, path: "/" }),
     );
-    expect(cookieSet).toHaveBeenCalledWith("nextchair_manager_session", "", { path: "/manager", maxAge: 0 });
   });
 
   it("marks the cookie Secure for an HTTPS deployment", async () => {

src/services/management/management-auth.ts

@@ -25,11 +25,7 @@ export function authenticateManager(email: string, password: string) {
 export async function createManagerSession() {
   const config = getManagerConfig();
   const value = `${config.adminEmail.trim().toLowerCase()}.${Date.now()}`;
-  const store = await cookies();
-  // Remove sessions issued by older builds with Path=/manager. Browsers can
-  // retain both cookies, and the stale one may be selected first on /manager.
-  store.set(COOKIE_NAME, "", { path: "/manager", maxAge: 0 });
-  store.set(COOKIE_NAME, `${value}.${signature(value, config.authSecret)}`, {
+  (await cookies()).set(COOKIE_NAME, `${value}.${signature(value, config.authSecret)}`, {
     httpOnly: true,
     sameSite: "strict",
     secure: isSecureDeployment(),
@@ -41,9 +37,7 @@ export async function createManagerSession() {
 }
 
 export async function clearManagerSession() {
-  const store = await cookies();
-  store.delete(COOKIE_NAME);
-  store.set(COOKIE_NAME, "", { path: "/manager", maxAge: 0 });
+  (await cookies()).delete(COOKIE_NAME);
 }
 
 export async function isManagerAuthenticated() {