[menu] handle logout without reload, show signin in sidebar when not logged in

frontend/src/app/components/master-page/master-page.component.html

@@ -1,4 +1,4 @@
-<app-menu *ngIf="servicesEnabled"></app-menu>
+<app-menu *ngIf="servicesEnabled" (loggedOut)="onLoggedOut()"></app-menu>
 
 <ng-container *ngIf="{ val: network$ | async } as network">
 <header *ngIf="headerVisible" style="position: fixed; width: 100%; z-index: 100;">

frontend/src/app/components/master-page/master-page.component.ts

@@ -59,7 +59,7 @@ export class MasterPageComponent implements OnInit {
     });
     
     this.servicesEnabled = this.officialMempoolSpace && this.stateService.env.ACCELERATOR === true && this.stateService.network === '';
-    this.userAuth = JSON.parse(localStorage.getItem('auth') || '') ?? null;
+    this.refreshAuth();
   }
 
   collapse(): void {
@@ -74,6 +74,14 @@ export class MasterPageComponent implements OnInit {
     this.stateService.resetScroll$.next(true);
   }
 
+  onLoggedOut() {
+    this.refreshAuth();
+  }
+
+  refreshAuth(): void {
+    this.userAuth = JSON.parse(localStorage.getItem('auth') || '') ?? null;
+  }
+
   hamburgerClick(): void {
     if (this.menuComponent) {
       this.menuComponent.hambugerClick();