refactor(web): dependency management (#2386)

packages/snjs/lib/Services/Session/SessionManager.ts

@@ -264,10 +264,15 @@ export class SessionManager
     }
   }
 
+  /** Unlike EncryptionService.hasAccount, isSignedIn can only be read once the application is unlocked */
   public isSignedIn(): boolean {
     return this.getUser() != undefined
   }
 
+  public isSignedOut(): boolean {
+    return !this.isSignedIn()
+  }
+
   public isSignedIntoFirstPartyServer(): boolean {
     return this.isSignedIn() && !this.apiService.isThirdPartyHostUsed()
   }