Feature/Fix: Routen-Navi, Badge-Klick-Fix, Forum-Edit, Chat-Unread-Refresh

- Routen: Navi-Button öffnet Apple Maps/Google Maps mit Start/Ziel-GPS
- Routen: Teilen-Button nutzt navigator.share() mit Fallback auf Clipboard
- Routen: Icon 'share' → 'arrow-square-out' (war nicht im Sprite)
- Nav-Badge: pointer-events:none → Badge blockiert keine Klicks mehr
- visibilitychange: Badges + Chat-Liste sofort refresh bei App-Rückkehr
- Forum: eigene Threads und Antworten bearbeiten (PATCH /threads/content, PATCH /posts)
- SW by-v238, APP_VER 215

backend/static/js/api.js

@@ -320,6 +320,8 @@ const API = (() => {
     patchThread(id, data)  { return patch(`/forum/threads/${id}`, data); },
     addPost(threadId, data){ return post(`/forum/threads/${threadId}/posts`, data); },
     deletePost(id)         { return del(`/forum/posts/${id}`); },
+    updateThread(id, data) { return patch(`/forum/threads/${id}/content`, data); },
+    updatePost(id, data)   { return patch(`/forum/posts/${id}`, data); },
     uploadThreadFoto(id, file) {
       const fd = new FormData(); fd.append('file', file);
       return upload(`/forum/threads/${id}/fotos`, fd);