feat(mobile): real chat list with pull-to-refresh + logout

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

@@ -1,25 +1,131 @@
-import { StyleSheet, Text, View } from 'react-native';
+import { chat } from '@chat-app/shared';
+import type { ConversationSummary } from '@chat-app/shared/chat';
+import { Stack, useRouter } from 'expo-router';
+import { useCallback, useEffect, useState } from 'react';
+import {
+  ActivityIndicator,
+  Alert,
+  FlatList,
+  Pressable,
+  RefreshControl,
+  StyleSheet,
+  Text,
+  View,
+} from 'react-native';
 
-// Phase 0 stand-in for the conversation list. Confirms the authenticated
+import { ConversationRow } from '../../components/ConversationRow';
-// route group (`(app)`) mounts without error after a navigation from
+import { useAuth } from '../../lib/authContext';
-// Landing. Phase 1 replaces this with the real chat list.
+import { supabase } from '../../lib/supabase';
+import { colors } from '../../theme/colors';
+
+// Phase 1 conversation list. The last-message preview is the static
+// fallback ('…') — fetching + decrypting last-messages per conversation
+// 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);
+
+  const load = useCallback(async () => {
+    setError(null);
+    try {
+      const result = await chat.listConversations(supabase);
+      setList(result.filter((c) => !c.archived));
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : 'Konversationen konnten nicht geladen werden');
+    }
+  }, []);
+
+  useEffect(() => {
+    void load();
+  }, [load]);
+
+  const onRefresh = useCallback(async () => {
+    setRefreshing(true);
+    await load();
+    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}>
-      <Text style={styles.title}>Netralax</Text>
+      <Stack.Screen
-      <Text style={styles.subtitle}>Chats — coming soon (Phase 1)</Text>
+        options={{
+          title: 'Chats',
+          headerStyle: { backgroundColor: colors.bg },
+          headerTitleStyle: { color: colors.text },
+          headerRight: () => (
+            <Pressable onPress={confirmLogout} hitSlop={10}>
+              <Text style={styles.logoutLink}>Abmelden</Text>
+            </Pressable>
+          ),
+        }}
+      />
+
+      {list === null && !error && (
+        <View style={styles.loading}>
+          <ActivityIndicator color={colors.accent} />
+        </View>
+      )}
+
+      {error && <Text style={styles.error}>{error}</Text>}
+
+      {list && list.length === 0 && !error && (
+        <View style={styles.empty}>
+          <Text style={styles.emptyText}>Noch keine Konversationen.</Text>
+          <Text style={styles.emptyHint}>
+            Lege dir auf dem Desktop einen Chat an — er taucht hier auf, sobald du
+            herunterziehst, um zu aktualisieren.
+          </Text>
+        </View>
+      )}
+
+      {list && list.length > 0 && (
+        <FlatList
+          data={list}
+          keyExtractor={(item) => item.id}
+          renderItem={({ item }) => (
+            <ConversationRow
+              conversation={item}
+              lastMessagePreview="…"
+              onPress={() => router.push('/(app)/conversations/' + item.id)}
+            />
+          )}
+          refreshControl={
+            <RefreshControl
+              refreshing={refreshing}
+              onRefresh={onRefresh}
+              tintColor={colors.accent}
+            />
+          }
+          ItemSeparatorComponent={() => <View style={styles.separator} />}
+        />
+      )}
     </View>
   );
 }
 
 const styles = StyleSheet.create({
-  container: {
+  container: { flex: 1, backgroundColor: colors.bg },
-    flex: 1,
+  loading: { flex: 1, alignItems: 'center', justifyContent: 'center' },
-    alignItems: 'center',
+  empty: { flex: 1, alignItems: 'center', justifyContent: 'center', padding: 32, gap: 8 },
-    justifyContent: 'center',
+  emptyText: { color: colors.text, fontSize: 16, fontWeight: '600' },
-    backgroundColor: '#0b0b0f',
+  emptyHint: { color: colors.textMuted, fontSize: 13, textAlign: 'center', lineHeight: 18 },
-    padding: 24,
+  error: { color: colors.danger, padding: 16, textAlign: 'center' },
-  },
+  separator: { height: 1, backgroundColor: colors.border, marginLeft: 68 },
-  title: { color: '#fff', fontSize: 28, fontWeight: '600' },
+  logoutLink: { color: colors.accent, fontSize: 14, fontWeight: '600', paddingHorizontal: 8 },
-  subtitle: { color: '#9ca3af', marginTop: 8, textAlign: 'center' },
 });