Replace admin MudBlazor shell with plain HTML

src/TaxBaik.Web.Client/Components/Admin/Shared/AdminShell.razor

@@ -9,12 +9,8 @@
             <div class="admin-brand-subtitle">세무회계 관리 대시보드</div>
         </div>
         <div class="admin-topbar-actions">
-            <MudButton Variant="Variant.Text" Size="Size.Small" Class="admin-topbar-action" Href="/taxbaik" Target="_blank" Rel="noopener">
-                공개 사이트
-            </MudButton>
-            <MudButton Variant="Variant.Text" Size="Size.Small" Class="admin-topbar-action" Href="/taxbaik/admin/logout">
-                로그아웃
-            </MudButton>
+            <a class="admin-topbar-action" href="/taxbaik" target="_blank" rel="noopener">공개 사이트</a>
+            <a class="admin-topbar-action" href="/taxbaik/admin/logout">로그아웃</a>
         </div>
     </header>
 
@@ -45,6 +41,8 @@
 
     private void OnLocationChanged(object? sender, LocationChangedEventArgs args)
     {
+        drawerOpen = true;
+        InvokeAsync(StateHasChanged);
     }
 
     private void ToggleDrawer()