Fix: Stream-close-warning via IPC statt async executeJavaScript

- Renderer meldet Streaming-Status synchron per IPC
- main.js prueft Status synchron im close-Handler
- Kein async Race mehr, Dialog erscheint zuverlaessig

electron/main.js

@@ -106,15 +106,13 @@ function createWindow() {
     }
   });
 
+  // Track streaming status from renderer (synchronous — no async race)
+  let isStreaming = false;
+  ipcMain.on('streaming-status', (_event, active) => { isStreaming = active; });
+
   // Warn before closing if a stream is active
-  let forceClose = false;
   mainWindow.on('close', (event) => {
-    if (forceClose) return;
+    if (!isStreaming) return;
-    event.preventDefault();
-    mainWindow.webContents.executeJavaScript(
-      `Array.from(document.querySelectorAll('video')).some(v => v.srcObject?.active)`
-    ).then((isStreaming) => {
-      if (!isStreaming) { forceClose = true; mainWindow.close(); return; }
     const result = dialog.showMessageBoxSync(mainWindow, {
       type: 'warning',
       buttons: ['Beenden', 'Abbrechen'],
@@ -123,8 +121,7 @@ function createWindow() {
       title: 'Stream laeuft noch!',
       message: 'Ein Stream ist noch aktiv.\nBeim Beenden wird der Stream gestoppt.',
     });
-      if (result === 0) { forceClose = true; mainWindow.close(); }
+    if (result !== 0) event.preventDefault();
-    }).catch(() => { forceClose = true; mainWindow.close(); });
   });
 }
 

electron/preload.js

@@ -6,4 +6,5 @@ contextBridge.exposeInMainWorld('electronAPI', {
   onUpdateAvailable: (callback) => ipcRenderer.on('update-available', callback),
   onUpdateReady: (callback) => ipcRenderer.on('update-ready', callback),
   installUpdate: () => ipcRenderer.send('install-update'),
+  setStreaming: (active) => ipcRenderer.send('streaming-status', active),
 });

web/src/plugins/streaming/StreamingTab.tsx

@@ -79,6 +79,11 @@ export default function StreamingTab({ data }: { data: any }) {
   useEffect(() => { isBroadcastingRef.current = isBroadcasting; }, [isBroadcasting]);
   useEffect(() => { viewingRef.current = viewing; }, [viewing]);
 
+  // Notify Electron about streaming status for close-warning
+  useEffect(() => {
+    (window as any).electronAPI?.setStreaming(isBroadcasting || viewing !== null);
+  }, [isBroadcasting, viewing]);
+
   // ── Elapsed time ticker ──
   useEffect(() => {
     const hasActive = streams.length > 0 || isBroadcasting;