feat(web): dashboard ergonomic cu tab-uri, stepper import si microcopy uman (3.4)

Reorganizeaza interfata web pe trei principii, fara a atinge backend-ul de
trimitere (worker, mapping, idempotency, masina de stari neatinse):

- US-001 app/web/labels.py: modul pur stari tehnice -> text uman + clasa CSS
- US-002 bara status /_fragments/status: microcopy uman, defalcare blocate, scoped cont
- US-003 shell 6 tab-uri (Acasa/Import/Coada/Mapari/Cont/Nomenclator): deep-link
  ?tab=, panou activ randat server-side, fragmente inactive lazy, ARIA real
- US-004 stepper import 4 pasi (pur vizual; hx-target + csrf pastrate)
- US-005 Acasa onboarding checklist auto-bifat + colaps + empty states prietenoase

Reparat in cursul VERIFY/CLOSE: izolare teste (reset ratelimit._hits in fixturi),
regresie avertisment "cont in asteptare de activare" (re-introdus in bara status),
culori hardcodate -> variabile paleta. 434 teste pass.

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

tests/test_import_ui.py

@@ -102,8 +102,11 @@ def _seed_op_mapping(client, cod_op: str = "Revizie", cod_prest: str = "OE-1") -
 # --------------------------------------------------------------------------- #
 
 def test_dashboard_contine_drop_zone(client):
-    """Dashboard-ul randeaza sectiunea de upload cu drop zone si mesaj warmth."""
-    r = client.get("/")
+    """Tab-ul Import randeaza sectiunea de upload cu drop zone si mesaj warmth.
+
+    Dupa US-003 sectiunea de import e in tab-ul Import (?tab=import), nu pe pagina principala.
+    """
+    r = client.get("/?tab=import")
     assert r.status_code == 200
     assert "Primul fisier" in r.text
     assert "drop-zone" in r.text