chore(Auth): reorder exports in Auth component

fix(PluginAuthForm): handle case when pluginKey is null or undefined
fix(PluginStoreDialog): handle case when getAvailablePluginFromKey is null or undefined
fix(AuthContext): make authConfig optional in AuthContextProvider
feat(hooks): add useServerStream hook
fix(conversation): setSubmission to null instead of empty object
fix(preset): specify type for presets atom
fix(search): specify type for isSearchEnabled atom
fix(submission): specify type for submission atom

client/src/store/preset.ts

@@ -6,7 +6,7 @@ import { TPreset } from 'librechat-data-provider';
 // an array of saved presets.
 // sample structure
 // [preset1, preset2, preset3]
-const presets = atom({
+const presets = atom<TPreset[]>({
   key: 'presets',
   default: [],
 });