Store readiness: in-app account deletion, privacy policy, terms, listing copy

Closes the remaining store-compliance gaps before App Store / Play
submission:

- Account deletion (App Store guideline 5.1.1): DELETE /me removes the
  user row (usage cascades). The app exposes it through one quiet
  'Account' caption link under the chat, visible only when signed in,
  driving two native dialogs (Sign out / Delete account with a
  destructive confirm) — no new views, no menus, minimalism intact.
  Deletion signs out and resets the app; copy notes that store
  subscriptions are cancelled in App Store / Play settings.
- docs/store/privacy-policy.md: the complete data inventory (matching
  the actual schema), transient OpenAI processing with no training, no
  profiling or ads, GDPR legal bases and rights, in-app erasure.
- docs/store/terms-of-service.md: not-therapy positioning with crisis
  guidance, AI-generated-content caveat, 18+ eligibility,
  auto-renewal/cancellation terms, liability, Swedish governing law.
- docs/store/listing.md: App Store and Play copy written to the
  honest-claims rule (subtitle 'Think Beyond Thought', keywords,
  descriptions), plus App Privacy and Data safety questionnaire
  mappings.
- LAUNCH.md updated: host the policy/terms, set store URLs, use the
  prepared listing copy.
- Tests: 30 passing (adds DELETE /me coverage).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0118DaxZR36RpnY524vRqx3z

apps/mobile/App.tsx

@@ -1,6 +1,7 @@
-import { useState } from 'react';
+import { useEffect, useState } from 'react';
 import { StatusBar } from 'expo-status-bar';
 import type { ChatMessage } from './src/api/client';
+import { getAccessToken } from './src/auth/session';
 import { ChatScreen } from './src/screens/ChatScreen';
 import { PaywallScreen } from './src/screens/PaywallScreen';
 
@@ -15,6 +16,19 @@ export default function App() {
   const [messages, setMessages] = useState<ChatMessage[]>([]);
   const [paywalled, setPaywalled] = useState(false);
   const [deliverAnalysis, setDeliverAnalysis] = useState(false);
+  const [signedIn, setSignedIn] = useState(false);
+
+  useEffect(() => {
+    getAccessToken().then((token) => setSignedIn(token !== null));
+  }, []);
+
+  function resetToSignedOut() {
+    setSignedIn(false);
+    setMessages([]);
+    setPaywalled(false);
+    setDeliverAnalysis(false);
+    setView('chat');
+  }
 
   return (
     <>
@@ -28,11 +42,14 @@ export default function App() {
           onContinueWithPremium={() => setView('paywall')}
           deliverAnalysis={deliverAnalysis}
           onAnalysisDelivered={() => setDeliverAnalysis(false)}
+          signedIn={signedIn}
+          onSignedOut={resetToSignedOut}
         />
       )}
       {view === 'paywall' && (
         <PaywallScreen
           onSubscribed={() => {
+            setSignedIn(true);
             setPaywalled(false);
             setDeliverAnalysis(true);
             setView('chat');