feat(app): buffer onboarding answers before auth, flush to profile after sign-up/login

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/auth/login.tsx

@@ -20,6 +20,7 @@ import { AuthService } from '../../services/authService';
 import * as AppleAuthentication from 'expo-apple-authentication';
 import Constants from 'expo-constants';
 import { useSafeAnalytics } from '../../services/analytics';
+import { PreAuthOnboardingService } from '../../services/preAuthOnboardingService';
 
 const ONBOARDING_AUTH_BACKGROUND = {
   light: '#fbfaf3',
@@ -70,6 +71,9 @@ export default function LoginScreen() {
     try {
       const session = await AuthService.login(email, password);
       const billing = await hydrateSession(session);
+      if (session?.userId) {
+        await PreAuthOnboardingService.flushToProfile(session.userId).catch(() => {});
+      }
       const isPro = billing?.entitlement?.plan === 'pro' && billing?.entitlement?.status === 'active';
       // Non-pro accounts land on the paywall with context instead of being
       // bounced through the root redirect (which looks like an app restart).
@@ -118,6 +122,9 @@ export default function LoginScreen() {
         name: fullName || undefined,
       });
       const billing = await hydrateSession(session);
+      if (session?.userId) {
+        await PreAuthOnboardingService.flushToProfile(session.userId).catch(() => {});
+      }
       if (session.isNewUser) {
         await AsyncStorage.setItem('greenlens_show_tour', 'true');
       }

app/auth/signup.tsx

@@ -20,6 +20,7 @@ import AsyncStorage from '@react-native-async-storage/async-storage';
 import * as AppleAuthentication from 'expo-apple-authentication';
 import Constants from 'expo-constants';
 import { useSafeAnalytics } from '../../services/analytics';
+import { PreAuthOnboardingService } from '../../services/preAuthOnboardingService';
 
 const ONBOARDING_AUTH_BACKGROUND = {
   light: '#fbfaf3',
@@ -83,6 +84,9 @@ export default function SignupScreen() {
     try {
       const session = await AuthService.signUp(email, name, password);
       await hydrateSession(session);
+      if (session?.userId) {
+        await PreAuthOnboardingService.flushToProfile(session.userId).catch(() => {});
+      }
       // Flag setzen: Tour beim nächsten App-Öffnen anzeigen
       await AsyncStorage.setItem('greenlens_show_tour', 'true');
       router.replace('/onboarding/source');
@@ -132,6 +136,9 @@ export default function SignupScreen() {
         name: fullName || undefined,
       });
       const billing = await hydrateSession(session);
+      if (session?.userId) {
+        await PreAuthOnboardingService.flushToProfile(session.userId).catch(() => {});
+      }
       await AsyncStorage.setItem('greenlens_show_tour', 'true');
       posthog.capture('apple_login_succeeded', { surface: 'signup' });
       const isPro = billing?.entitlement?.plan === 'pro' && billing?.entitlement?.status === 'active';

services/preAuthOnboardingService.ts

@@ -0,0 +1,36 @@
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import { OnboardingProgressService } from './onboardingProgressService';
+
+const STORAGE_KEY = 'greenlens_preauth_onboarding_v1';
+
+export type PreAuthAnswers = {
+  acquisitionSource?: string;
+  primaryGoal?: string;
+  experienceLevel?: string;
+};
+
+export const PreAuthOnboardingService = {
+  async setAnswer<K extends keyof PreAuthAnswers>(key: K, value: PreAuthAnswers[K]): Promise<void> {
+    const answers = await this.getAnswers();
+    answers[key] = value;
+    await AsyncStorage.setItem(STORAGE_KEY, JSON.stringify(answers));
+  },
+
+  async getAnswers(): Promise<PreAuthAnswers> {
+    try {
+      const raw = await AsyncStorage.getItem(STORAGE_KEY);
+      return raw ? (JSON.parse(raw) as PreAuthAnswers) : {};
+    } catch {
+      return {};
+    }
+  },
+
+  // Persist buffered answers into the per-user profile after sign-up/login.
+  async flushToProfile(userId: number): Promise<void> {
+    const answers = await this.getAnswers();
+    if (answers.acquisitionSource) OnboardingProgressService.setAcquisitionSource(userId, answers.acquisitionSource);
+    if (answers.primaryGoal) OnboardingProgressService.setPrimaryGoal(userId, answers.primaryGoal);
+    if (answers.experienceLevel) OnboardingProgressService.setExperienceLevel(userId, answers.experienceLevel);
+    await AsyncStorage.removeItem(STORAGE_KEY);
+  },
+};