Feature: тёмная тема, минималистичный UI, улучшения UX

Co-authored-by: Cursor <cursoragent@cursor.com>

app/templates/registration/login.html

@@ -1,14 +1,20 @@
 {% extends "base.html" %}
 {% block title %}Вход — ERP WaterSurf{% endblock %}
 {% block content %}
-<div class="row justify-content-center">
-  <div class="col-md-4">
-    <h2>Вход</h2>
-    <form method="post" action="{% url 'users:login' %}">
-      {% csrf_token %}
-      {{ form.as_p }}
-      <button type="submit" class="btn btn-primary">Войти</button>
-    </form>
-  </div>
+<div class="ws-card ws-login-card">
+  <h1 class="ws-login-title">Вход</h1>
+  <form method="post" action="{% url 'users:login' %}" class="ws-form-login">
+    {% csrf_token %}
+    {% for field in form %}
+    <div class="ws-form-group">
+      <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+      {{ field }}
+      {% if field.errors %}<small class="ws-text-danger">{{ field.errors.0 }}</small>{% endif %}
+    </div>
+    {% endfor %}
+    <div class="ws-btn-group" style="margin-top: 1.5rem;">
+      <button type="submit" class="btn btn-ws-primary">Войти</button>
+    </div>
+  </form>
 </div>
 {% endblock %}