feat: 優化採購單操作紀錄與統一刪除確認 UI

- 優化採購單更新與刪除的活動紀錄邏輯 (PurchaseOrderController)
  - 整合更新異動為單一紀錄，包含品項差異
  - 刪除時記錄當下品項快照
- 統一採購單刪除確認介面，使用 AlertDialog 取代原生 confirm (PurchaseOrderActions)
- Refactor: 將 ActivityDetailDialog 移至 Components/ActivityLog 並優化樣式與大數據顯示
- 調整 UI 文字：將「總金額」統一為「小計」
- 其他模型與 Controller 的活動紀錄支援更新

app/Models/PurchaseOrder.php

@@ -44,6 +44,8 @@ class PurchaseOrder extends Model
         'supplierName',
         'expectedDate',
         'totalAmount',
+        'taxAmount', // Add this
+        'grandTotal', // Add this
         'createdBy',
         'warehouse_name',
         'createdAt',
@@ -82,6 +84,16 @@ class PurchaseOrder extends Model
         return (float) ($this->attributes['total_amount'] ?? 0);
     }
 
+    public function getTaxAmountAttribute(): float
+    {
+        return (float) ($this->attributes['tax_amount'] ?? 0);
+    }
+
+    public function getGrandTotalAttribute(): float
+    {
+        return (float) ($this->attributes['grand_total'] ?? 0);
+    }
+
     public function getCreatedByAttribute(): string
     {
         return $this->user ? $this->user->name : '系統';
@@ -135,4 +147,21 @@ class PurchaseOrder extends Model
             ->logOnlyDirty()
             ->dontSubmitEmptyLogs();
     }
+
+    public function tapActivity(\Spatie\Activitylog\Contracts\Activity $activity, string $eventName)
+    {
+        $properties = $activity->properties;
+        $attributes = $properties['attributes'] ?? [];
+        $snapshot = $properties['snapshot'] ?? [];
+
+        // Snapshot key names
+        $snapshot['po_number'] = $this->code;
+        $snapshot['vendor_name'] = $this->vendor ? $this->vendor->name : null;
+        $snapshot['warehouse_name'] = $this->warehouse ? $this->warehouse->name : null;
+        $snapshot['user_name'] = $this->user ? $this->user->name : null;
+
+        $properties['attributes'] = $attributes;
+        $properties['snapshot'] = $snapshot;
+        $activity->properties = $properties;
+    }
 }