fix(auth): show Apple sign-in on Windows and Linux

src/components/AuthenticationStep.tsx

@@ -14,7 +14,6 @@ import { Button } from "./ui/button";
 import { Input } from "./ui/input";
 import { AlertCircle, ArrowRight, Building2, Check, Loader2, ChevronLeft } from "lucide-react";
 import logger from "../utils/logger";
-import { getCachedPlatform } from "../utils/platform";
 import ForgotPasswordView from "./ForgotPasswordView";
 import { CompactOnboardingFrame } from "./onboarding/OnboardingShell";
 
@@ -139,7 +138,6 @@ export default function AuthenticationStep({
   const [error, setError] = useState<string | null>(null);
   const [forgotPasswordOpen, setForgotPasswordOpen] = useState(false);
   const [oauthProtocolRegistered, setOauthProtocolRegistered] = useState(true);
-  const isMacOS = getCachedPlatform() === "darwin";
 
   const needsVerificationRef = useRef(false);
 
@@ -612,17 +610,13 @@ export default function AuthenticationStep({
       onClick: () => handleSocialSignIn("google"),
       loading: isSocialLoading === "google",
     },
-    ...(isMacOS
-      ? [
-          {
-            id: "apple",
-            label: "Apple",
-            icon: AppleIcon,
-            onClick: () => handleSocialSignIn("apple"),
-            loading: isSocialLoading === "apple",
-          },
-        ]
-      : []),
+    {
+      id: "apple",
+      label: "Apple",
+      icon: AppleIcon,
+      onClick: () => handleSocialSignIn("apple"),
+      loading: isSocialLoading === "apple",
+    },
     {
       id: "microsoft",
       label: "Microsoft",

test/components/authenticationStep.test.js

@@ -15,6 +15,7 @@ function createHarness(values = {}) {
     refCursor: 0,
     values,
     refs: {},
+    socialSignIns: [],
     discoveryCalls: [],
     discoveryResult: { exists: false },
     discoveryError: null,
@@ -39,7 +40,7 @@ async function settleAsyncHandler() {
   await new Promise((resolve) => setImmediate(resolve));
 }
 
-test("email authentication discovers accounts before choosing sign-in or sign-up", async (t) => {
+test("authentication discovers accounts and exposes Apple sign-in off macOS", async (t) => {
   installBrowserGlobals(t, { window: { electronAPI: {} } });
   t.after(() => {
     delete globalThis.__authenticationStepHarness;
@@ -98,7 +99,10 @@ test("email authentication discovers accounts before choosing sign-in or sign-up
           },
           signIn: { async email() { return {}; } },
         };
-        export async function signInWithSocial() { return {}; }
+        export async function signInWithSocial(provider) {
+          globalThis.__authenticationStepHarness.socialSignIns.push(provider);
+          return {};
+        }
         export async function signInWithSSO() { return {}; }
         export function updateLastSignInTime() {}
       `,
@@ -198,4 +202,13 @@ test("email authentication discovers accounts before choosing sign-in or sign-up
   assert.equal(duplicateRace.values[AUTH_MODE_INDEX], "sign-in");
   assert.equal(duplicateRace.values[PASSWORD_INDEX], "");
   assert.equal(duplicateRace.values[ERROR_INDEX], "auth.errors.accountExistsSignIn");
+
+  const linuxSocialSignIn = createHarness();
+  const appleProvider = findElement(
+    render(linuxSocialSignIn),
+    (node) => node.props?.label === "Apple" && typeof node.props?.onClick === "function"
+  );
+  assert.ok(appleProvider, "Apple sign-in should render on Linux");
+  await appleProvider.props.onClick();
+  assert.deepEqual(linuxSocialSignIn.socialSignIns, ["apple"]);
 });