frontend error management enhancement

app/templates/shop/errors/422.html

@@ -0,0 +1,46 @@
+{% extends "shop/errors/base.html" %}
+
+{% block icon %}📝{% endblock %}
+
+{% block title %}422 - Invalid Information{% 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">422</div>
+<div class="status-name">Please Check Your Information</div>
+<div class="error-message">
+    Some of the information you provided isn't valid. Please review the form and try again.
+</div>
+
+{% if details and details.validation_errors %}
+<div style="margin: 2rem auto; max-width: 400px; text-align: left; background: #fef2f2; padding: 1.5rem; border-radius: 0.75rem; border-left: 4px solid var(--color-primary);">
+    <h3 style="color: var(--color-text); font-size: 0.875rem; margin-bottom: 0.75rem; font-weight: 600;">Please correct:</h3>
+    <ul style="list-style: none; padding: 0; margin: 0;">
+    {% for error in details.validation_errors %}
+        <li style="margin-bottom: 0.5rem; color: #7f1d1d; font-size: 0.875rem;">
+            • {{ error.msg }}
+        </li>
+    {% endfor %}
+    </ul>
+</div>
+{% endif %}
+
+<div class="action-buttons">
+    <a href="javascript:history.back()" class="btn btn-primary">Go Back and Fix</a>
+    <a href="/" class="btn btn-secondary">Go to Home</a>
+</div>
+
+<div class="support-link">
+    Having trouble? <a href="/contact">We're here to help</a>
+</div>
+
+{% if vendor %}
+<div class="vendor-info">
+    {{ vendor.name }}
+</div>
+{% endif %}
+{% endblock %}