feat(5.9): US-008 - responsive Acasa (upload/status/filtre) + login/signup

- base.html: bloc @media (max-width:767px) US-008, scopat pe id-urile de pe Acasa
- upload (#import-section): drop-zone pe coloana, buton alegere full-width >=44px
- filtre (#filtre-trimiteri): o coloana, inputuri/buton full-width >=44px (!important pe latimile inline)
- status (#status-bar): randuri aliniate, fara scroll orizontal
- login.html/signup.html: clasa .auth-card centrata, max-width:100% pe mobil
- tabelul de trimiteri 5.8 neatins (doar verificat intact)
- teste noi: test_acasa_fara_scroll_orizontal_mobil, test_login_signup_full_width_mobil
- suita: 840 passed, 1 deselected

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/web/templates/login.html

@@ -1,7 +1,7 @@
 {% extends "base.html" %}
 {% block title %}Autentificare — Gateway RAR AUTOPASS{% endblock %}
 {% block content %}
-<div class="card" style="max-width:400px;margin:40px auto;">
+<div class="card auth-card" style="max-width:400px;margin:40px auto;">
   <h2 style="margin-top:0;">Autentificare</h2>
 
   {% if error %}