[PM-10799] Login UI Width (#10506)

* reset `maxWidth` attribute during page change

* set default value for `maxWidth` if null or undefined is passed

* implement `maxWidth` for extension implementation of Anon Layout

libs/auth/src/angular/anon-layout/anon-layout.component.ts

@@ -76,6 +76,10 @@ export class AnonLayoutComponent implements OnInit, OnChanges {
       const theme = await firstValueFrom(this.themeStateService.selectedTheme$);
       await this.updateIcon(theme);
     }
+
+    if (changes.maxWidth) {
+      this.maxWidth = changes.maxWidth.currentValue ?? "md";
+    }
   }
 
   private async updateIcon(theme: string) {