frontend error management enhancement

app/templates/shop/errors/401.html

@@ -0,0 +1,33 @@
+{% extends "shop/errors/base.html" %}
+
+{% block icon %}🔐{% endblock %}
+
+{% block title %}401 - Authentication Required{% endblock %}
+
+{% block content %}
+{% if vendor and theme and theme.branding and theme.branding.logo %}
+<img src="{{ theme.branding.logo }}" alt="{{ vendor.name }}" class="vendor-logo">
+{% endif %}
+
+<div class="error-icon">🔐</div>
+<div class="status-code">401</div>
+<div class="status-name">Please Log In</div>
+<div class="error-message">
+    You need to be logged in to access this page. Please sign in to continue shopping.
+</div>
+
+<div class="action-buttons">
+    <a href="/login" class="btn btn-primary">Log In</a>
+    <a href="/register" class="btn btn-secondary">Create Account</a>
+</div>
+
+<div class="support-link">
+    Don't have an account? <a href="/register">Sign up now</a>
+</div>
+
+{% if vendor %}
+<div class="vendor-info">
+    {{ vendor.name }}
+</div>
+{% endif %}
+{% endblock %}