Move left pane entirely to React

ts/state/selectors/user.ts

@@ -0,0 +1,23 @@
+import { createSelector } from 'reselect';
+
+import { LocalizerType } from '../../types/Util';
+
+import { StateType } from '../reducer';
+import { UserStateType } from '../ducks/user';
+
+export const getUser = (state: StateType): UserStateType => state.user;
+
+export const getUserNumber = createSelector(
+  getUser,
+  (state: UserStateType): string => state.ourNumber
+);
+
+export const getRegionCode = createSelector(
+  getUser,
+  (state: UserStateType): string => state.regionCode
+);
+
+export const getIntl = createSelector(
+  getUser,
+  (state: UserStateType): LocalizerType => state.i18n
+);