feat(sprint4): completar optimizador heuristico concurrente, integracion Spring Boot, correccion de login y fixes visuales

app/routes/auth.py

@@ -8,15 +8,18 @@ from datetime import datetime
 
 auth_bp = Blueprint('auth', __name__)
 
+from sqlalchemy import func
+
 @auth_bp.route('/login', methods=['GET', 'POST'])
 def login():
-    """Handle user login"""
+    """Handle user login with case-insensitive email lookup and whitespace trimming"""
     if current_user.is_authenticated:
         return redirect(url_for('main.dashboard'))
     
     form = LoginForm()
     if form.validate_on_submit():
-        user = User.query.filter_by(email=form.email.data).first()
+        clean_email = (form.email.data or '').strip().lower()
+        user = User.query.filter(func.lower(User.email) == clean_email).first()
         
         if user and user.check_password(form.password.data):
             if not user.is_active:
@@ -25,6 +28,19 @@ def login():
             
             login_user(user, remember=form.remember_me.data)
             user.update_last_login()
+
+            # Registrar en bitácora de auditoría
+            try:
+                from app.services.audit_service import AuditService
+                AuditService.log(
+                    action='LOGIN',
+                    module='auth',
+                    user_id=user.id,
+                    user_email=user.email,
+                    details=f"Inicio de sesión exitoso ({user.role})"
+                )
+            except Exception:
+                pass
             
             # Si el usuario tiene idioma configurado en su perfil, sobrescribe el navegador en toda la sesión
             if user.preferred_language and user.preferred_language in ['es', 'en']:
@@ -42,6 +58,15 @@ def login():
             flash(_('¡Bienvenido de nuevo, %(name)s!', name=user_full_name), 'success')
             return redirect(next_page)
         else:
+            try:
+                from app.services.audit_service import AuditService
+                AuditService.log(
+                    action='LOGIN_FAILED',
+                    module='auth',
+                    details=f"Intento fallido de login con email: {clean_email}"
+                )
+            except Exception:
+                pass
             flash(_('Correo electrónico o contraseña inválidos.'), 'error')
     
     return render_template('auth/login.html', form=form)