refactor: migrate account-menu to react - implement functionality

- remove all Angular code related to `account-menu`
- rename React component to AccountMenu so that many parts of old code remain unchanged
- code cleanup

app/assets/javascripts/views/footer/footer_view.ts

@@ -62,7 +62,6 @@ class FooterViewCtrl extends PureViewCtrl<unknown, {
   public user?: any
   private offline = true
   public showAccountMenu = false
-  public showAccountMenuReact = false
   private didCheckForOffline = false
   private queueExtReload = false
   private reloadInProgress = false
@@ -116,7 +115,6 @@ class FooterViewCtrl extends PureViewCtrl<unknown, {
     this.autorun(() => {
       const showBetaWarning = this.appState.showBetaWarning;
       this.showAccountMenu = this.appState.accountMenu.show;
-      this.showAccountMenuReact = this.appState.accountMenuReact.show;
       this.setState({
         showBetaWarning: showBetaWarning,
         showDataUpgrade: !showBetaWarning
@@ -256,7 +254,6 @@ class FooterViewCtrl extends PureViewCtrl<unknown, {
           this.didCheckForOffline = true;
           if (this.offline && this.application.getNoteCount() === 0) {
             this.appState.accountMenu.setShow(true);
-            this.appState.accountMenuReact.setShow(true);
           }
         }
         this.syncUpdated();
@@ -439,7 +436,6 @@ class FooterViewCtrl extends PureViewCtrl<unknown, {
 
   accountMenuPressed() {
     this.appState.accountMenu.toggleShow();
-    this.appState.accountMenuReact.toggleShow();
     this.closeAllRooms();
   }
 
@@ -449,7 +445,6 @@ class FooterViewCtrl extends PureViewCtrl<unknown, {
 
   closeAccountMenu() {
     this.appState.accountMenu.setShow(false);
-    this.appState.accountMenuReact.setShow(false);
   }
 
   lockApp() {
@@ -567,7 +562,6 @@ class FooterViewCtrl extends PureViewCtrl<unknown, {
       return;
     }
     this.appState.accountMenu.setShow(false);
-    this.appState.accountMenuReact.setShow(false);
   }
 }