fix(admin): standardize empty CRM states

TaxBaik.Web/Components/Admin/Pages/ConsultingActivities.razor

@@ -26,10 +26,10 @@
     }
     else if (activities.Count == 0)
     {
-        <div class="pa-6 text-center">
-            <MudIcon Icon="@Icons.Material.Filled.Timeline" Style="font-size:3rem; opacity:.3;" />
-            <MudText Class="mt-2 text-muted">상담 활동이 없습니다.</MudText>
-        </div>
+        <MudAlert Severity="Severity.Info" Class="mt-4">
+            <MudIcon Icon="@Icons.Material.Filled.Timeline" Class="me-2" />
+            상담 활동이 없습니다.
+        </MudAlert>
     }
     else
     {

TaxBaik.Web/Components/Admin/Pages/Contracts.razor

@@ -33,10 +33,10 @@
     }
     else if (contracts.Count == 0)
     {
-        <div class="pa-6 text-center">
-            <MudIcon Icon="@Icons.Material.Filled.Description" Style="font-size:3rem; opacity:.3;" />
-            <MudText Class="mt-2 text-muted">계약이 없습니다.</MudText>
-        </div>
+        <MudAlert Severity="Severity.Info" Class="mt-4">
+            <MudIcon Icon="@Icons.Material.Filled.Description" Class="me-2" />
+            계약이 없습니다.
+        </MudAlert>
     }
     else
     {

TaxBaik.Web/Components/Admin/Pages/RevenueTrackings.razor

@@ -26,10 +26,10 @@
     }
     else if (revenues.Count == 0)
     {
-        <div class="pa-6 text-center">
-            <MudIcon Icon="@Icons.Material.Filled.Payments" Style="font-size:3rem; opacity:.3;" />
-            <MudText Class="mt-2 text-muted">청구 기록이 없습니다.</MudText>
-        </div>
+        <MudAlert Severity="Severity.Info" Class="mt-4">
+            <MudIcon Icon="@Icons.Material.Filled.Payments" Class="me-2" />
+            청구 기록이 없습니다.
+        </MudAlert>
     }
     else
     {

TaxBaik.Web/Components/Admin/Pages/TaxFilingSchedules.razor

@@ -29,10 +29,10 @@
     }
     else if (schedules.Count == 0)
     {
-        <div class="pa-6 text-center">
-            <MudIcon Icon="@Icons.Material.Filled.EventBusy" Style="font-size:3rem; opacity:.3;" />
-            <MudText Class="mt-2 text-muted">신고 일정이 없습니다.</MudText>
-        </div>
+        <MudAlert Severity="Severity.Info" Class="mt-4">
+            <MudIcon Icon="@Icons.Material.Filled.EventBusy" Class="me-2" />
+            신고 일정이 없습니다.
+        </MudAlert>
     }
     else
     {