frontend error management enhancement

app/templates/admin/errors/403.html

@@ -0,0 +1,44 @@
+{% extends "admin/errors/base.html" %}
+
+{% block icon %}🚫{% endblock %}
+
+{% block title %}403 - Access Denied{% endblock %}
+
+{% block content %}
+<div class="error-icon">🚫</div>
+<div class="status-code">403</div>
+<div class="status-name">Access Denied</div>
+<div class="error-message">
+    You don't have permission to access this admin resource. If you believe this is an error, please contact your administrator.
+</div>
+<div class="error-code">Error Code: {{ error_code }}</div>
+
+<div class="action-buttons">
+    <a href="/admin/dashboard" class="btn btn-primary">Go to Dashboard</a>
+    <a href="javascript:history.back()" class="btn btn-secondary">Go Back</a>
+</div>
+
+{% if show_debug %}
+<div class="debug-info">
+    <h3>🔧 Debug Information (Admin Only)</h3>
+    <div class="debug-item">
+        <span class="debug-label">Path:</span>
+        <span class="debug-value">{{ path }}</span>
+    </div>
+    <div class="debug-item">
+        <span class="debug-label">Error Code:</span>
+        <span class="debug-value">{{ error_code }}</span>
+    </div>
+    {% if details %}
+    <div class="debug-item">
+        <span class="debug-label">Details:</span>
+        <pre>{{ details | tojson(indent=2) }}</pre>
+    </div>
+    {% endif %}
+</div>
+{% endif %}
+
+<div class="support-link">
+    Need elevated permissions? <a href="/admin/support">Contact Administrator</a>
+</div>
+{% endblock %}