refactor: admin ui를 fluent v5와 html 기반으로 전환

TaxBaik.Web/Components/Admin/Pages/Companies/CompanyCreate.razor

@@ -3,22 +3,22 @@
 @using TaxBaik.Web.Components.Admin.Forms
 @inject IApiClient ApiClient
 @inject NavigationManager Navigation
-@inject ISnackbar Snackbar
+@inject IJSRuntime JS
 
 <PageTitle>고객사 등록</PageTitle>
 
 <section class="admin-page-hero">
     <div>
-        <MudText Typo="Typo.caption" Class="admin-eyebrow">Settings</MudText>
-        <MudText Typo="Typo.h4" Class="admin-page-title">새 고객사 등록</MudText>
-        <MudText Typo="Typo.body2" Class="admin-page-subtitle">새로운 고객사를 추가합니다.</MudText>
+        <div class="admin-eyebrow">Settings</div>
+        <h1 class="admin-page-title">새 고객사 등록</h1>
+        <p class="admin-page-subtitle">새로운 고객사를 추가합니다.</p>
     </div>
-    <MudButton Variant="Variant.Outlined" StartIcon="@Icons.Material.Filled.Close" @onclick="GoBack">취소</MudButton>
+    <button type="button" class="site-button secondary" @onclick="GoBack">취소</button>
 </section>
 
-<MudPaper Class="pa-4 mt-4" Elevation="1">
+<div class="admin-surface mt-4">
     <CompanyForm ButtonText="등록" OnSubmit="HandleCreate" OnCancel="GoBack" />
-</MudPaper>
+</div>
 
 @code {
     private void GoBack()
@@ -40,12 +40,12 @@
                 memo = model.Memo
             });
 
-            Snackbar.Add("고객사가 등록되었습니다.", Severity.Success);
+            await JS.InvokeVoidAsync("alert", "고객사가 등록되었습니다.");
             Navigation.NavigateTo("/taxbaik/admin/companies");
         }
         catch (Exception ex)
         {
-            Snackbar.Add($"등록 실패: {ex.Message}", Severity.Error);
+            await JS.InvokeVoidAsync("alert", $"등록 실패: {ex.Message}");
         }
     }
 }