fix: clear stale weekly preference after concurrent changes

src/components/tools/BriefTercihi.jsx

@@ -11,7 +11,7 @@ function BriefPanel(){
  const [value,setValue]=useState(null),[metin,setMetin]=useState(null),[busy,setBusy]=useState(true),[error,setError]=useState(null),[attempt,setAttempt]=useState(0);
  const lifetime=useRef(null),lock=useRef(false);
  useEffect(()=>{
-  const controller=new AbortController();lifetime.current=controller;lock.current=true;setBusy(true);setError(null);
+  const controller=new AbortController();lifetime.current=controller;lock.current=true;setBusy(true);setError(null);setValue(null);
   getWeeklyBrief({signal:controller.signal}).then(data=>{if(!controller.signal.aborted)setValue(data);})
    .catch(e=>{if(!controller.signal.aborted)setError(e.message);})
    .finally(()=>{if(!controller.signal.aborted){lock.current=false;setBusy(false);}});
@@ -23,7 +23,11 @@ function BriefPanel(){
   try{
    const data=preview?await getWeeklyBrief({preview:true,signal}):await saveWeeklyBrief(!value.kapali,value.revision,{signal});
    if(!signal.aborted){setValue(data);if(preview)setMetin(data.metin);}
-  }catch(e){if(!signal.aborted)setError(e.message);}
+  }catch(e){if(!signal.aborted){
+   if(e.kod==='VERSION_CONFLICT'){
+    setValue(null);setMetin(null);setError('Bu tercih başka bir sekmede veya cihazda değişti. Güncel durumu görmek için Özet ayarını yenile düğmesine basın.');
+   }else setError(e.message);
+  }}
   finally{if(!signal.aborted){lock.current=false;setBusy(false);}}
  };
  return <section aria-label="Haftalık özet ayarı" className="bg-white rounded-2xl border border-slate-200 p-5 space-y-3">