feat: 統一全系統頁面標題樣式、優化側邊欄與實作角色成員查看功能

resources/js/Pages/Error/403.tsx

@@ -0,0 +1,36 @@
+import { Link } from "@inertiajs/react";
+import { ShieldAlert, Home } from "lucide-react";
+
+export default function Error403() {
+    return (
+        <div className="min-h-screen bg-slate-50 flex flex-col items-center justify-center p-6">
+            <div className="max-w-md w-full text-center">
+                {/* 圖示 */}
+                <div className="mb-6 flex justify-center">
+                    <div className="w-24 h-24 bg-red-100 rounded-full flex items-center justify-center">
+                        <ShieldAlert className="w-12 h-12 text-red-500" />
+                    </div>
+                </div>
+
+                {/* 標題 */}
+                <h1 className="text-3xl font-bold text-slate-900 mb-2">
+                    無此權限
+                </h1>
+
+                {/* 說明 */}
+                <p className="text-slate-600 mb-8">
+                    您沒有存取此頁面的權限，請洽系統管理員。
+                </p>
+
+                {/* 返回按鈕 */}
+                <Link
+                    href="/"
+                    className="inline-flex items-center gap-2 px-6 py-3 bg-primary-main text-white rounded-lg hover:bg-primary-dark transition-colors"
+                >
+                    <Home className="w-5 h-5" />
+                    返回首頁
+                </Link>
+            </div>
+        </div>
+    );
+}