feat(dm): info sheet + avatar→profile + scroll fix + image cache

- Header: Avatar-Tap navigiert direkt zum Profil des Chatpartners
- Header: Info-Icon (ℹ) rechts öffnet neues Info-Sheet
- Header: kein separater BG mehr — blendet in native Background ein
- Info-Sheet (pageSheet Modal):
    - Partner-Karte mit Avatar + "Profil anzeigen"-Link
    - Geteilte Medien als 3-Spalten-Grid (neueste zuerst)
    - Tap auf Bild → Lightbox-Modal (Vollbild mit Close-Button)
- Scroll-to-bottom: 3-stufiges Timing (rAF + 100ms + 300ms) für
  zuverlässiges Bottom-Scroll auch wenn Bilder nachgeladen werden
- expo-image cachePolicy="memory-disk" überall: ChatBubble-Image +
  alle Images im Info-Sheet + Lightbox
- i18n: dm.view_profile / dm.shared_media / dm.no_shared_media (DE/EN/FR/AR)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/rebreak-native/app/dm.tsx

@@ -10,6 +10,9 @@ import {
   ActivityIndicator,
   StyleSheet,
   Keyboard,
+  Modal,
+  ScrollView,
+  Dimensions,
   type FlatList as FlatListType,
 } from 'react-native';
 import { KeyboardStickyView } from 'react-native-keyboard-controller';
@@ -88,6 +91,8 @@ export default function DmScreen() {
   const [keyboardVisible, setKeyboardVisible] = useState(false);
   const [keyboardHeight, setKeyboardHeight] = useState(0);
   const [inputBarHeight, setInputBarHeight] = useState(60);
+  const [infoSheetOpen, setInfoSheetOpen] = useState(false);
+  const [lightboxUri, setLightboxUri] = useState<string | null>(null);
 
   // Reset aller conversation-spezifischen States wenn userId wechselt (Stack-Reuse)
   useEffect(() => {
@@ -162,8 +167,11 @@ export default function DmScreen() {
         deleted: m.deleted ?? false,
       }));
       setMessages(msgs);
+      // Dreistufiges Scroll-to-bottom: rAF + 100ms + 300ms deckt
+      // Fälle ab wo Bilder nachgeladen werden und Content-Höhe wächst.
       requestAnimationFrame(() => flatListRef.current?.scrollToEnd({ animated: false }));
       setTimeout(() => flatListRef.current?.scrollToEnd({ animated: false }), 100);
+      setTimeout(() => flatListRef.current?.scrollToEnd({ animated: false }), 300);
       return data;
       } catch (err: any) {
         console.error('[dm] history fetch failed:', err?.message ?? err);
@@ -460,13 +468,17 @@ export default function DmScreen() {
 
   return (
     <SafeAreaView style={styles.container} edges={['top']}>
-      <View
+      <View style={[styles.header, { backgroundColor: colors.bg }]}>
-        style={[styles.header, { backgroundColor: colors.surface }]}
-      >
         <TouchableOpacity style={styles.backBtn} onPress={() => router.back()} hitSlop={8} activeOpacity={0.7}>
           <Ionicons name="chevron-back" size={22} color={colors.text} />
         </TouchableOpacity>
-        <View style={styles.headerCenter}>
+
+        {/* Avatar + Name — tap → Profil */}
+        <TouchableOpacity
+          style={styles.headerCenter}
+          activeOpacity={0.7}
+          onPress={() => userId && router.push(`/profile/${userId}` as any)}
+        >
           <View style={{ marginRight: 8 }}>
             <UserAvatar
               userId={userId ?? null}
@@ -481,7 +493,17 @@ export default function DmScreen() {
             </Text>
             {userId && <ChatHeaderStatus userId={userId} />}
           </View>
-        </View>
+        </TouchableOpacity>
+
+        {/* Info-Button */}
+        <TouchableOpacity
+          style={styles.infoBtn}
+          hitSlop={8}
+          activeOpacity={0.7}
+          onPress={() => setInfoSheetOpen(true)}
+        >
+          <Ionicons name="information-circle-outline" size={24} color={colors.text} />
+        </TouchableOpacity>
       </View>
 
       <View style={{ flex: 1, backgroundColor: chatBg }}>
@@ -610,10 +632,180 @@ export default function DmScreen() {
           </View>
         </View>
       </KeyboardStickyView>
+
+      {/* ── Info-Sheet ─────────────────────────────────────────────── */}
+      <DmInfoSheet
+        visible={infoSheetOpen}
+        onClose={() => setInfoSheetOpen(false)}
+        partner={partner}
+        messages={messages}
+        onImagePress={(uri) => setLightboxUri(uri)}
+        onViewProfile={() => {
+          setInfoSheetOpen(false);
+          setTimeout(() => userId && router.push(`/profile/${userId}` as any), 250);
+        }}
+        colors={colors}
+        t={t}
+      />
+
+      {/* ── Lightbox ───────────────────────────────────────────────── */}
+      <Modal visible={!!lightboxUri} transparent animationType="fade" onRequestClose={() => setLightboxUri(null)}>
+        <TouchableOpacity
+          style={{ flex: 1, backgroundColor: 'rgba(0,0,0,0.92)', alignItems: 'center', justifyContent: 'center' }}
+          activeOpacity={1}
+          onPress={() => setLightboxUri(null)}
+        >
+          {lightboxUri && (
+            <Image
+              source={{ uri: lightboxUri }}
+              style={{ width: Dimensions.get('window').width, height: Dimensions.get('window').width }}
+              contentFit="contain"
+              cachePolicy="memory-disk"
+            />
+          )}
+          <TouchableOpacity
+            style={{ position: 'absolute', top: 54, right: 20, padding: 8 }}
+            onPress={() => setLightboxUri(null)}
+            activeOpacity={0.7}
+          >
+            <Ionicons name="close-circle" size={32} color="#fff" />
+          </TouchableOpacity>
+        </TouchableOpacity>
+      </Modal>
     </SafeAreaView>
   );
 }
 
+// ─── DmInfoSheet ─────────────────────────────────────────────────────────────
+
+const MEDIA_COL = 3;
+const MEDIA_GAP = 2;
+const MEDIA_SIZE = (Dimensions.get('window').width - MEDIA_GAP * (MEDIA_COL + 1)) / MEDIA_COL;
+
+function DmInfoSheet({
+  visible,
+  onClose,
+  partner,
+  messages,
+  onImagePress,
+  onViewProfile,
+  colors,
+  t,
+}: {
+  visible: boolean;
+  onClose: () => void;
+  partner: { id: string; nickname: string; avatar?: string | null } | null;
+  messages: ChatMsg[];
+  onImagePress: (uri: string) => void;
+  onViewProfile: () => void;
+  colors: ReturnType<typeof useColors>;
+  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
+}) {
+  const sharedMedia = messages.filter(
+    (m) => m.attachmentType === 'image' && m.attachmentUrl,
+  );
+
+  return (
+    <Modal visible={visible} animationType="slide" presentationStyle="pageSheet" onRequestClose={onClose}>
+      <View style={{ flex: 1, backgroundColor: colors.bg }}>
+        {/* Header */}
+        <View style={{
+          flexDirection: 'row', alignItems: 'center', paddingHorizontal: 16,
+          paddingTop: 16, paddingBottom: 12,
+          borderBottomWidth: StyleSheet.hairlineWidth, borderBottomColor: colors.border,
+        }}>
+          <Text style={{ flex: 1, fontSize: 17, fontFamily: 'Nunito_700Bold', color: colors.text }}>
+            {t('chat.info')}
+          </Text>
+          <TouchableOpacity onPress={onClose} hitSlop={8} activeOpacity={0.7}>
+            <Ionicons name="close" size={24} color={colors.text} />
+          </TouchableOpacity>
+        </View>
+
+        <ScrollView contentContainerStyle={{ paddingBottom: 40 }}>
+          {/* Partner-Karte */}
+          <TouchableOpacity
+            activeOpacity={0.7}
+            onPress={onViewProfile}
+            style={{
+              flexDirection: 'row', alignItems: 'center',
+              padding: 16, gap: 14,
+            }}
+          >
+            {partner?.avatar ? (
+              <Image
+                source={{ uri: partner.avatar }}
+                style={{ width: 56, height: 56, borderRadius: 28 }}
+                contentFit="cover"
+                cachePolicy="memory-disk"
+              />
+            ) : (
+              <View style={{
+                width: 56, height: 56, borderRadius: 28,
+                backgroundColor: colors.brandOrange + '30',
+                alignItems: 'center', justifyContent: 'center',
+              }}>
+                <Text style={{ fontSize: 20, fontFamily: 'Nunito_700Bold', color: colors.brandOrange }}>
+                  {partner?.nickname?.[0]?.toUpperCase() ?? '?'}
+                </Text>
+              </View>
+            )}
+            <View style={{ flex: 1 }}>
+              <Text style={{ fontSize: 17, fontFamily: 'Nunito_700Bold', color: colors.text }}>
+                {partner?.nickname ?? '…'}
+              </Text>
+              <Text style={{ fontSize: 13, fontFamily: 'Nunito_400Regular', color: colors.textMuted, marginTop: 2 }}>
+                {t('dm.view_profile', { defaultValue: 'Profil anzeigen' })}
+              </Text>
+            </View>
+            <Ionicons name="chevron-forward" size={18} color={colors.textMuted} />
+          </TouchableOpacity>
+
+          <View style={{ height: StyleSheet.hairlineWidth, backgroundColor: colors.border, marginHorizontal: 16 }} />
+
+          {/* Geteilte Medien */}
+          <View style={{ paddingHorizontal: 16, paddingTop: 20, paddingBottom: 12 }}>
+            <Text style={{ fontSize: 15, fontFamily: 'Nunito_700Bold', color: colors.text }}>
+              {t('dm.shared_media', { defaultValue: 'Geteilte Medien' })}
+              {sharedMedia.length > 0 && (
+                <Text style={{ fontSize: 13, fontFamily: 'Nunito_400Regular', color: colors.textMuted }}>
+                  {'  '}{sharedMedia.length}
+                </Text>
+              )}
+            </Text>
+          </View>
+
+          {sharedMedia.length === 0 ? (
+            <View style={{ alignItems: 'center', paddingVertical: 32 }}>
+              <Ionicons name="images-outline" size={40} color={colors.textMuted} />
+              <Text style={{ marginTop: 10, fontSize: 13, fontFamily: 'Nunito_400Regular', color: colors.textMuted }}>
+                {t('dm.no_shared_media', { defaultValue: 'Keine geteilten Medien' })}
+              </Text>
+            </View>
+          ) : (
+            <View style={{ flexDirection: 'row', flexWrap: 'wrap', gap: MEDIA_GAP, paddingHorizontal: MEDIA_GAP }}>
+              {[...sharedMedia].reverse().map((m) => (
+                <TouchableOpacity
+                  key={m.id}
+                  activeOpacity={0.8}
+                  onPress={() => onImagePress(m.attachmentUrl!)}
+                >
+                  <Image
+                    source={{ uri: m.attachmentUrl! }}
+                    style={{ width: MEDIA_SIZE, height: MEDIA_SIZE }}
+                    contentFit="cover"
+                    cachePolicy="memory-disk"
+                  />
+                </TouchableOpacity>
+              ))}
+            </View>
+          )}
+        </ScrollView>
+      </View>
+    </Modal>
+  );
+}
+
 function makeStyles(colors: ReturnType<typeof useColors>) {
   return StyleSheet.create({
     container: { flex: 1, backgroundColor: colors.bg },
@@ -622,8 +814,6 @@ function makeStyles(colors: ReturnType<typeof useColors>) {
       alignItems: 'center',
       paddingHorizontal: 12,
       paddingVertical: 10,
-      borderBottomWidth: StyleSheet.hairlineWidth,
-      borderBottomColor: colors.border,
     },
     backBtn: {
       padding: 8,
@@ -636,6 +826,11 @@ function makeStyles(colors: ReturnType<typeof useColors>) {
       alignItems: 'center',
       marginLeft: 8,
     },
+    infoBtn: {
+      padding: 8,
+      alignItems: 'center',
+      justifyContent: 'center',
+    },
     headerName: {
       fontSize: 15,
       fontFamily: 'Nunito_700Bold',

apps/rebreak-native/components/chat/ChatBubble.tsx

@@ -146,7 +146,7 @@ export function ChatBubble({
       ]}
     >
       {msg.attachmentUrl && msg.attachmentType === 'image' ? (
-        <Image source={{ uri: msg.attachmentUrl }} style={styles.image} contentFit="cover" />
+        <Image source={{ uri: msg.attachmentUrl }} style={styles.image} contentFit="cover" cachePolicy="memory-disk" />
       ) : msg.content !== '' ? (
         <Text style={[styles.content, { color: bubbleText }]}>{msg.content}</Text>
       ) : null}

apps/rebreak-native/locales/ar.json

@@ -1013,6 +1013,11 @@
     "photo_access_title": "الوصول إلى الصور",
     "photo_access_body": "يرجى السماح بالوصول إلى الصور في الإعدادات."
   },
+  "dm": {
+    "view_profile": "عرض الملف الشخصي",
+    "shared_media": "الوسائط المشتركة",
+    "no_shared_media": "لا توجد وسائط مشتركة"
+  },
   "community": {
     "compose_placeholder": "ما الذي يشغلك الآن؟",
     "compose_default_user": "أنت",

apps/rebreak-native/locales/de.json

@@ -1078,6 +1078,11 @@
     "photo_access_title": "Foto-Zugriff",
     "photo_access_body": "Bitte erlaube den Foto-Zugriff in den Einstellungen."
   },
+  "dm": {
+    "view_profile": "Profil anzeigen",
+    "shared_media": "Geteilte Medien",
+    "no_shared_media": "Keine geteilten Medien"
+  },
   "community": {
     "compose_placeholder": "Was bewegt dich gerade?",
     "compose_default_user": "Du",

apps/rebreak-native/locales/en.json

@@ -1078,6 +1078,11 @@
     "photo_access_title": "Photo access",
     "photo_access_body": "Please allow photo access in Settings."
   },
+  "dm": {
+    "view_profile": "View profile",
+    "shared_media": "Shared Media",
+    "no_shared_media": "No shared media yet"
+  },
   "community": {
     "compose_placeholder": "What's on your mind?",
     "compose_default_user": "You",

apps/rebreak-native/locales/fr.json

@@ -1000,6 +1000,11 @@
     "photo_access_title": "Accès aux photos",
     "photo_access_body": "Veuillez autoriser l'accès aux photos dans les paramètres."
   },
+  "dm": {
+    "view_profile": "Voir le profil",
+    "shared_media": "Médias partagés",
+    "no_shared_media": "Aucun média partagé"
+  },
   "community": {
     "compose_placeholder": "Qu'est-ce qui vous préoccupe en ce moment ?",
     "compose_default_user": "Vous",