Nachrichten: Design-Label, server-seitige Präferenz, mobiler Leerraum fix

backend/src/db.js

@@ -246,6 +246,11 @@ if (msgCols2.length && !msgCols2.includes('read_by_recipient')) {
   db.exec("ALTER TABLE messages ADD COLUMN read_by_recipient INTEGER NOT NULL DEFAULT 0");
 }
 
+// User-Preferences (JSON-Blob)
+const userCols2 = db.prepare("PRAGMA table_info(users)").all().map(r => r.name);
+if (!userCols2.includes('preferences'))
+  db.exec("ALTER TABLE users ADD COLUMN preferences TEXT DEFAULT NULL");
+
 // ── Login-Sicherheit ──────────────────────────────────────────────────────────
 // Spalten für Account-Lockout in users-Tabelle
 const userCols = db.prepare("PRAGMA table_info(users)").all().map(r => r.name);

backend/src/routes/auth.js

@@ -150,4 +150,20 @@ router.delete('/account', authenticate, (req, res) => {
   res.json({ success: true });
 });
 
+// ── GET/PUT /api/auth/preferences ─────────────────────────────────────────────
+router.get('/preferences', authenticate, (req, res) => {
+  const user = db.prepare('SELECT preferences FROM users WHERE id=?').get(req.user.id);
+  try { res.json(JSON.parse(user?.preferences || '{}')); }
+  catch { res.json({}); }
+});
+
+router.put('/preferences', authenticate, (req, res) => {
+  const user = db.prepare('SELECT preferences FROM users WHERE id=?').get(req.user.id);
+  let current = {};
+  try { current = JSON.parse(user?.preferences || '{}'); } catch {}
+  const merged = { ...current, ...req.body };
+  db.prepare('UPDATE users SET preferences=? WHERE id=?').run(JSON.stringify(merged), req.user.id);
+  res.json(merged);
+});
+
 module.exports = router;

frontend/src/App.jsx

@@ -1660,7 +1660,7 @@ export default function App() {
   const activeTool = TOOLS.find(t=>t.id===active);
 
   // Mobile padding bottom für fixed nav
-  const mainStyle = { flex:1, overflowY:'auto', ...(mobile ? { paddingBottom:'calc(56px + env(safe-area-inset-bottom, 0px))' } : {}) };
+  const mainStyle = { flex:1, overflowY:'auto', ...(mobile ? { paddingBottom: active==='nachrichten' ? 0 : 'calc(56px + env(safe-area-inset-bottom, 0px))' } : {}) };
 
   return(
     <>

frontend/src/tools/nachrichten.jsx

@@ -82,8 +82,16 @@ export default function Nachrichten({ toast, mobile }) {
   const [text,        setText]        = useState('');
   const [sending,     setSending]     = useState(false);
   const [showPicker,  setShowPicker]  = useState(false);
-  const [mirc,        setMirc]        = useState(() => localStorage.getItem('dd_chat_design') === 'mirc');
-  const toggleDesign = () => setMirc(v => { const n = !v; localStorage.setItem('dd_chat_design', n ? 'mirc' : 'modern'); return n; });
+  const [mirc,        setMirc]        = useState(false);
+  // Preference vom Server laden
+  useEffect(() => {
+    api('/auth/preferences').then(p => { if (p.chat_design === 'mirc') setMirc(true); }).catch(()=>{});
+  }, []);
+  const toggleDesign = () => setMirc(v => {
+    const next = !v;
+    api('/auth/preferences', { method:'PUT', body:{ chat_design: next ? 'mirc' : 'modern' } }).catch(()=>{});
+    return next;
+  });
   const bottomRef = useRef(null);
   const pollRef   = useRef(null);
   const pickerRef = useRef(null);
@@ -247,12 +255,12 @@ export default function Nachrichten({ toast, mobile }) {
             display:'flex', alignItems:'center', justifyContent:'space-between' }}>
             <div style={{ ...S.head, marginBottom:0 }}>NACHRICHTEN</div>
             <div style={{ display:'flex', gap:5 }}>
-              <button onClick={toggleDesign} title={mirc ? 'Modern' : 'mIRC-Stil'}
-                style={{ background: mirc ? 'rgba(78,205,196,0.12)' : 'transparent',
-                  border:`1px solid ${mirc ? 'rgba(78,205,196,0.3)' : 'rgba(255,255,255,0.1)'}`,
-                  borderRadius:7, color: mirc ? '#4ecdc4' : 'rgba(255,255,255,0.35)',
-                  cursor:'pointer', padding:'3px 7px', fontSize:10, fontFamily:'monospace', lineHeight:1 }}>
-                {mirc ? '◈ mIRC' : '◈'}
+              <button onClick={toggleDesign} title={mirc ? 'Zu Modern wechseln' : 'Zu mIRC wechseln'}
+                style={{ background: 'rgba(255,255,255,0.05)',
+                  border:'1px solid rgba(255,255,255,0.1)',
+                  borderRadius:7, color:'rgba(255,255,255,0.55)',
+                  cursor:'pointer', padding:'3px 8px', fontSize:10, fontFamily:'monospace', lineHeight:1 }}>
+                {mirc ? '◈ mIRC' : '◈ Modern'}
               </button>
               <button onClick={() => { loadUsers(); if (activeUser) loadMessages(activeUser.id); }} title="Neu laden"
                 style={{ background:'transparent', border:'1px solid rgba(255,255,255,0.1)', borderRadius:7,