Replaced redux with zustand. Fixed login issue, closes #980.

store/app.js

@@ -0,0 +1,30 @@
+import create from 'zustand';
+import { DEFAULT_LOCALE, DEFAULT_THEME, LOCALE_CONFIG, THEME_CONFIG } from 'lib/constants';
+import { getItem } from 'lib/web';
+
+const initialState = {
+  locale: getItem(LOCALE_CONFIG) || DEFAULT_LOCALE,
+  theme: getItem(THEME_CONFIG) || DEFAULT_THEME,
+  shareToken: null,
+  user: null,
+};
+
+const store = create(() => ({ ...initialState }));
+
+export function setTheme(theme) {
+  store.setState({ theme });
+}
+
+export function setLocale(locale) {
+  store.setState({ locale });
+}
+
+export function setShareToken(shareToken) {
+  store.setState({ shareToken });
+}
+
+export function setUser(user) {
+  store.setState({ user });
+}
+
+export default store;