fix race on lcd / cwd

must be done in main thread for access to NSTextView’s string rep

NvimView/Sources/NvimView/NvimView+UiBridge.swift

@@ -508,7 +508,9 @@ extension NvimView {
 
     self.bridgeLogger.debug(cwd)
     self._cwd = URL(fileURLWithPath: cwd)
+    gui.async { [self] in
       self.tabBar?.cwd = cwd
+    }
     self.eventsSubject.onNext(.cwdChanged)
   }