fix: add admin-page-hero to BlogCreate for consistent navigation

TaxBaik.Web/Components/Admin/Pages/Blog/BlogCreate.razor

@@ -10,9 +10,16 @@
 
 <PageTitle>새 포스트 작성</PageTitle>
 
-<MudText Typo="Typo.h5" Class="mb-4">📝 새 포스트</MudText>
+<section class="admin-page-hero">
+    <div>
+        <MudText Typo="Typo.caption" Class="admin-eyebrow">Content</MudText>
+        <MudText Typo="Typo.h4" Class="admin-page-title">새 포스트 작성</MudText>
+        <MudText Typo="Typo.body2" Class="admin-page-subtitle">새로운 블로그 포스트를 작성합니다.</MudText>
+    </div>
+    <MudButton Variant="Variant.Outlined" StartIcon="@Icons.Material.Filled.Close" @onclick="GoBack">취소</MudButton>
+</section>
 
-<MudPaper Class="pa-4" Elevation="1">
+<MudPaper Class="pa-4" Elevation="1" Class="mt-4">
     <MudForm @ref="form">
         <MudTextField @bind-Value="model.Title" Label="제목"
             Variant="Variant.Outlined" Class="mb-4" Required="true" />
@@ -42,9 +49,6 @@
         <div class="d-flex gap-2">
             <MudButton Variant="Variant.Filled" Color="Color.Primary"
                 @onclick="SavePost">저장</MudButton>
-            <MudButton Variant="Variant.Outlined" @onclick="@(() => Navigation.NavigateTo("/taxbaik/admin/blog"))">
-                취소
-            </MudButton>
         </div>
     </MudForm>
 </MudPaper>
@@ -59,6 +63,11 @@
         categories = (await CategoryRepository.GetAllAsync()).ToList();
     }
 
+    private void GoBack()
+    {
+        Navigation.NavigateTo("/taxbaik/admin/blog");
+    }
+
     private async Task SavePost()
     {
         if (form == null)