DossierSettings: show restart-required hint after language change

Instead of a temporary 'saved' checkmark, show a persistent warn-colored
'Neustart erforderlich' / 'Restart required' badge (in the newly selected
language) until the window is closed. Guards against no-op clicks (same lang).

src/DossierSettingsApp.jsx

@@ -13,7 +13,7 @@ export default function DossierSettingsApp() {
   const initial = (typeof window !== 'undefined' && window.PANEL_PARAMS) || {}
   const [lang,        setLang]        = useState(initial.lang        || 'de')
   const [launcherOk,  setLauncherOk]  = useState(initial.launcherOk  ?? null)
-  const [saved,       setSaved]       = useState(false)
+  const [needsRestart, setNeedsRestart] = useState(false)
 
   useEffect(() => {
     notifyReady()
@@ -24,10 +24,10 @@ export default function DossierSettingsApp() {
   }, [])
 
   function handleLang(id) {
+    if (id === lang) return
     setLang(id)
     bridgeSend('SAVE_LANG', { lang: id })
-    setSaved(true)
-    setTimeout(() => setSaved(false), 1800)
+    setNeedsRestart(true)
   }
 
   const label = (de, en) => lang === 'en' ? en : de
@@ -55,16 +55,16 @@ export default function DossierSettingsApp() {
         <span style={{ fontWeight: 600, fontSize: 13, letterSpacing: '0.01em' }}>
           {label('Dossier-Einstellungen', 'Dossier Settings')}
         </span>
-        {saved && (
+        {needsRestart && (
           <span style={{
             fontSize: 10,
-            color: 'var(--accent)',
+            color: 'var(--warn)',
             display: 'flex',
             alignItems: 'center',
             gap: 4,
           }}>
-            <Icon name="check_circle" size={13} />
-            {label('Gespeichert', 'Saved')}
+            <Icon name="restart_alt" size={13} />
+            {label('Neustart erforderlich', 'Restart required')}
           </span>
         )}
       </div>