feat: fetch features and store locally for offline users (#706)

* feat: fetch features and store locally for offline users

* feat: handle success and error cases

* refactor: move offline activation code reading/validation to snjs

* chore: update after renaming snjs function

* fix: correct condition for checking offline users

* feat: let users remove their previous offline keys (WIP)

* refactor: handle setOfflineFeatures function response accordingly

* feat: remove corresponding local data when removing offline key

* fix: use snjs' confirm dialog instead of custom one

* feat: show warning before installing extension from untrusted source

* refactor: move functions for validating external feature url and checking if custom server host was used to snjs

* chore: put correct snjs version

* chore: make `eslint-plugin-react-hooks` in yarn.lock to match the `develop` branch

* chore: deps update

* chore: deps update

app/assets/javascripts/preferences/panes/account/Advanced.tsx

@@ -0,0 +1,26 @@
+import { FunctionalComponent } from 'preact';
+import { PreferencesGroup, PreferencesSegment, Title } from '@/preferences/components';
+import { OfflineSubscription } from '@/preferences/panes/account/offlineSubscription';
+import { WebApplication } from '@/ui_models/application';
+import { observer } from 'mobx-react-lite';
+import { AppState } from '@/ui_models/app_state';
+
+interface IProps {
+  application: WebApplication;
+  appState: AppState;
+}
+
+export const Advanced: FunctionalComponent<IProps> = observer(({ application, appState }) => {
+  return (
+    <PreferencesGroup>
+      <PreferencesSegment>
+        <div className='flex flex-row items-center'>
+          <div className='flex-grow flex flex-col'>
+            <Title>Advanced Settings</Title>
+            <OfflineSubscription application={application} appState={appState} />
+          </div>
+        </div>
+      </PreferencesSegment>
+    </PreferencesGroup>
+  );
+});