Fix: Benachrichtigungen öffnen direkt das Ziel-Item

- forum_reply → öffnet direkt den Forum-Thread (openThread exposed)
- walk_invite → öffnet direkt das Gassi-Treffen (openDetail exposed)
- poison_alert → öffnet direkt den Giftköder-Eintrag (openDetail exposed)
- chat_message → öffnet direkt den Chat-Thread (war schon vorhanden)
- _execNav nutzt nav.data statt nav.data?.field für konsistentes Parsing

backend/static/js/app.js

@@ -3,7 +3,7 @@
    Router, State-Management, Navigation, Initialisierung.
    ============================================================ */
 
-const APP_VER = '212'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
+const APP_VER = '213'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
 
 const App = (() => {
 

backend/static/js/pages/forum.js

@@ -1009,6 +1009,6 @@ window.Page_forum = (() => {
     document.body.appendChild(lb);
   }
 
-  return { init, refresh, onDogChange, openNew };
+  return { init, refresh, onDogChange, openNew, openThread: _openThread };
 
 })();

backend/static/js/pages/notifications.js

@@ -63,22 +63,35 @@ window.Page_notifications = (() => {
             : () => App.navigate('chat'),
         };
 
-      case 'friend_request':
+      case 'forum_reply':
+      case 'forum_mention':
         return {
-          page: 'friends', label: 'Freunde',
-          go: () => App.navigate('friends'),
+          page: 'forum', label: 'Forum',
+          go: d.id
+            ? () => App.callModule('forum', 'openThread', d.id)
+            : () => App.navigate('forum'),
         };
 
       case 'walk_invite':
         return {
           page: 'walks', label: 'Gassi-Treffen',
-          go: () => App.navigate('walks'),
+          go: d.walk_id
+            ? () => App.callModule('walks', 'openDetail', d.walk_id)
+            : () => App.navigate('walks'),
         };
 
       case 'poison_alert':
         return {
           page: 'poison', label: 'Giftköder-Alarm',
-          go: () => App.navigate('poison'),
+          go: d.id
+            ? () => App.callModule('poison', 'openDetail', { id: d.id })
+            : () => App.navigate('poison'),
+        };
+
+      case 'friend_request':
+        return {
+          page: 'friends', label: 'Freunde',
+          go: () => App.navigate('friends'),
         };
 
       case 'health_reminder':
@@ -132,17 +145,32 @@ window.Page_notifications = (() => {
 
   /** Führt die kontextspezifische Navigation aus */
   function _execNav(nav) {
+    const d = nav.data || {};
     switch (nav.type) {
       case 'chat_message':
-        nav.data?.conversation_id
-          ? App.callModule('chat', '_openThread', nav.data.conversation_id)
+        d.conversation_id
+          ? App.callModule('chat', '_openThread', d.conversation_id)
           : App.navigate('chat');
         break;
-      case 'friend_request': App.navigate('friends');    break;
-      case 'walk_invite':    App.navigate('walks');      break;
-      case 'poison_alert':   App.navigate('poison');     break;
-      case 'health_reminder':App.navigate('health');     break;
-      case 'milestone':      App.navigate('diary');      break;
+      case 'forum_reply':
+      case 'forum_mention':
+        d.id
+          ? App.callModule('forum', 'openThread', d.id)
+          : App.navigate('forum');
+        break;
+      case 'walk_invite':
+        d.walk_id
+          ? App.callModule('walks', 'openDetail', d.walk_id)
+          : App.navigate('walks');
+        break;
+      case 'poison_alert':
+        d.id
+          ? App.callModule('poison', 'openDetail', { id: d.id })
+          : App.navigate('poison');
+        break;
+      case 'friend_request': App.navigate('friends');  break;
+      case 'health_reminder':App.navigate('health');   break;
+      case 'milestone':      App.navigate('diary');    break;
       default:
         if (nav.page) App.navigate(nav.page);
     }

backend/static/js/pages/poison.js

@@ -585,6 +585,6 @@ window.Page_poison = (() => {
   // ----------------------------------------------------------
   // PUBLIC
   // ----------------------------------------------------------
-  return { init, refresh, openNew };
+  return { init, refresh, openNew, openDetail: _openDetail };
 
 })();

backend/static/js/pages/walks.js

@@ -952,6 +952,6 @@ window.Page_walks = (() => {
     });
   }
 
-  return { init, refresh, onDogChange, openNew };
+  return { init, refresh, onDogChange, openNew, openDetail: _openDetail };
 
 })();