Hang up any active calls when quitting

app/main.ts

@@ -1700,6 +1700,10 @@ app.on('before-quit', () => {
   });
 
   windowState.markShouldQuit();
+
+  if (mainWindow) {
+    mainWindow.webContents.send('quit');
+  }
 });
 
 // Quit when all windows are closed.

ts/services/calling.ts

@@ -288,6 +288,12 @@ export class CallingClass {
       uxActions.setPresenting();
     });
 
+    ipcRenderer.on('quit', () => {
+      for (const conversationId of Object.keys(this.callsByConversation)) {
+        this.hangup(conversationId);
+      }
+    });
+
     this.cleanExpiredGroupCallRingsAndLoop();
   }