Remove leftover admin topbar overrides

src/TaxBaik.Web/Pages/Admin/Index.cshtml

@@ -4,25 +4,53 @@
     ViewData["Title"] = "관리자 홈";
 }
 
-<section class="container py-5">
-    <div class="row align-items-center g-4">
-        <div class="col-lg-8">
-            <p class="text-uppercase text-muted small mb-2">TaxBaik Admin</p>
-            <h1 class="display-6 fw-bold mb-3">고객관리 어드민</h1>
-            <p class="lead text-muted mb-0">
-                Razor Pages + Cookie Authentication + Dapper + Flyway 기준으로 정리하는 서버 렌더링 어드민입니다.
-            </p>
+<section class="admin-page-shell">
+    <div class="page-header d-print-none mb-4">
+        <div class="row align-items-center">
+            <div class="col">
+                <div class="page-pretitle">TaxBaik Admin</div>
+                <h2 class="page-title">고객관리 어드민</h2>
+                <p class="text-muted mb-0">Razor Pages + Cookie Authentication + Dapper + Flyway 기준으로 정리하는 서버 렌더링 어드민입니다.</p>
+            </div>
         </div>
-        <div class="col-lg-4">
-            <div class="card shadow-sm border-0">
-                <div class="card-body p-4">
-                    <div class="d-grid gap-2">
-                        <a class="btn btn-dark" href="/admin/dashboard">대시보드</a>
-                        <a class="btn btn-outline-secondary" href="/admin/login?returnUrl=%2Fadmin%2Fdashboard">다시 로그인</a>
-                    </div>
+    </div>
+
+    <div class="row row-deck row-cards g-3">
+        <div class="col-md-6 col-xl-4">
+            <div class="card card-sm">
+                <div class="card-body">
+                    <div class="text-muted small text-uppercase mb-1">진입</div>
+                    <h3 class="h4 mb-2">대시보드</h3>
+                    <p class="text-muted mb-0">업무 시작점과 주요 상태를 확인합니다.</p>
+                </div>
+                <div class="card-footer">
+                    <a class="btn btn-primary w-100" href="/admin/dashboard">대시보드 열기</a>
+                </div>
+            </div>
+        </div>
+        <div class="col-md-6 col-xl-4">
+            <div class="card card-sm">
+                <div class="card-body">
+                    <div class="text-muted small text-uppercase mb-1">세션</div>
+                    <h3 class="h4 mb-2">인증 상태</h3>
+                    <p class="text-muted mb-0">쿠키 인증과 배포 간 유지성을 확인합니다.</p>
+                </div>
+                <div class="card-footer">
+                    <a class="btn btn-outline-secondary w-100" href="/admin/login?returnUrl=%2Fadmin%2Fdashboard">다시 로그인</a>
+                </div>
+            </div>
+        </div>
+        <div class="col-md-6 col-xl-4">
+            <div class="card card-sm">
+                <div class="card-body">
+                    <div class="text-muted small text-uppercase mb-1">구조</div>
+                    <h3 class="h4 mb-2">Tabler UI</h3>
+                    <p class="text-muted mb-0">공통 카드, 테이블, 배지, 폼을 표준화합니다.</p>
+                </div>
+                <div class="card-footer">
+                    <span class="badge bg-blue-lt text-blue">Server Rendered</span>
                 </div>
             </div>
         </div>
     </div>
 </section>
-