refactor(mobile): chats header opens settings instead of inline logout

apps/mobile/app/(app)/chats.tsx

@@ -4,7 +4,6 @@ import { Stack, useRouter } from 'expo-router';
 import { useCallback, useEffect, useState } from 'react';
 import {
   ActivityIndicator,
-  Alert,
   FlatList,
   Pressable,
   RefreshControl,
@@ -14,7 +13,6 @@ import {
 } from 'react-native';
 
 import { ConversationRow } from '../../components/ConversationRow';
-import { useAuth } from '../../lib/authContext';
 import { supabase } from '../../lib/supabase';
 import { colors } from '../../theme/colors';
 
@@ -23,7 +21,6 @@ import { colors } from '../../theme/colors';
 // is a Phase 1.5 follow-up. Tap → conversation detail.
 export default function Chats() {
   const router = useRouter();
-  const { signOut } = useAuth();
   const [list, setList] = useState<ConversationSummary[] | null>(null);
   const [refreshing, setRefreshing] = useState(false);
   const [error, setError] = useState<string | null>(null);
@@ -48,19 +45,6 @@ export default function Chats() {
     setRefreshing(false);
   }, [load]);
 
-  const confirmLogout = () => {
-    Alert.alert('Abmelden', 'Diese Sitzung beenden?', [
-      { text: 'Abbrechen', style: 'cancel' },
-      {
-        text: 'Abmelden',
-        style: 'destructive',
-        onPress: () => {
-          void signOut();
-        },
-      },
-    ]);
-  };
-
   return (
     <View style={styles.container}>
       <Stack.Screen
@@ -69,8 +53,8 @@ export default function Chats() {
           headerStyle: { backgroundColor: colors.bg },
           headerTitleStyle: { color: colors.text },
           headerRight: () => (
-            <Pressable onPress={confirmLogout} hitSlop={10}>
-              <Text style={styles.logoutLink}>Abmelden</Text>
+            <Pressable onPress={() => router.push('/(app)/settings')} hitSlop={10}>
+              <Text style={styles.logoutLink}>Einstellungen</Text>
             </Pressable>
           ),
         }}