fix: notify graph dir is gone when starting or running the apps

Also, disabled both re-index and refresh when logseq detects that
a graph's dir doesn't exists anymore.

src/main/frontend/handler/web/nfs.cljs

@@ -327,9 +327,11 @@
             _ (ok-handler)]
       (state/set-nfs-refreshing! false))))
 
+;; TODO: move to frontend.handler.repo
 (defn refresh!
   [repo ok-handler]
-  (when repo
+  (when (and repo
+             (not (state/unlinked-dir? (config/get-repo-dir repo))))
     (state/set-nfs-refreshing! true)
     (p/let [_ (reload-dir! repo)
             _ (ok-handler)]