fix: show create user errors inside dialog, pre-fill form on error

Used novalidate + server-side validation so errors appear in the dialog
rather than as browser-native popups. Form fields retain submitted values.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/templates/admin/users.html

@@ -15,33 +15,38 @@
             <button aria-label="Закрыть" rel="prev" onclick="document.getElementById('create-user-dialog').close()"></button>
             <h3>Создать пользователя</h3>
         </header>
-        <form method="post" action="/admin/users/create">
+        {% if create_errors %}
+        <div role="alert" class="alert alert-danger mb-3">
+            {% for e in create_errors %}<p>{{ e }}</p>{% endfor %}
+        </div>
+        {% endif %}
+        <form method="post" action="/admin/users/create" novalidate>
             <div class="row gap-2 mb-2">
                 <div class="col">
                     <label for="cu_first_name">Имя
-                        <input type="text" id="cu_first_name" name="first_name" required>
+                        <input type="text" id="cu_first_name" name="first_name" value="{{ create_form.first_name if create_form else '' }}" required>
                     </label>
                 </div>
                 <div class="col">
                     <label for="cu_last_name">Фамилия
-                        <input type="text" id="cu_last_name" name="last_name">
+                        <input type="text" id="cu_last_name" name="last_name" value="{{ create_form.last_name if create_form else '' }}">
                     </label>
                 </div>
             </div>
             <label for="cu_email">Email
-                <input type="email" id="cu_email" name="email" required>
+                <input type="text" id="cu_email" name="email" value="{{ create_form.email if create_form else '' }}" required>
             </label>
             <label for="cu_phone">Телефон
-                <input type="tel" id="cu_phone" name="phone" placeholder="+7 (999) 999-99-99">
+                <input type="tel" id="cu_phone" name="phone" value="{{ create_form.phone if create_form else '' }}" placeholder="+7 (999) 999-99-99">
             </label>
             <label for="cu_password">Пароль
-                <input type="password" id="cu_password" name="password" minlength="8" required>
+                <input type="password" id="cu_password" name="password" required>
             </label>
             {% if user.role == 'system' %}
             <label for="cu_role">Роль
                 <select id="cu_role" name="role">
-                    <option value="user" selected>Пользователь</option>
-                    <option value="admin">Администратор</option>
+                    <option value="user" {% if not create_form or create_form.role == 'user' %}selected{% endif %}>Пользователь</option>
+                    <option value="admin" {% if create_form and create_form.role == 'admin' %}selected{% endif %}>Администратор</option>
                 </select>
             </label>
             {% endif %}
@@ -54,9 +59,6 @@
 </dialog>
 
 {% if create_errors %}
-<div role="alert" class="alert alert-danger mb-3">
-    {% for e in create_errors %}<p>{{ e }}</p>{% endfor %}
-</div>
 <script>document.addEventListener('DOMContentLoaded', () => document.getElementById('create-user-dialog').showModal());</script>
 {% endif %}