feat(errors): erori pe 3 niveluri (problema+cauza+fix) pe API si UI (PRD 5.4)

Catalog central pur app/errors.py ca sursa unica cod->{problema,fix},
consumat de API+UI+worker. Aditiv (field/message pastrate la octet) +
rar_error stocat superset. Scope: fluxul de declarare; login/signup/CSRF
neatinse. labels.parse_erori degradeaza gratios; UI progresiv AA light+dark.
631 teste.

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

tests/test_validare_dryrun.py

@@ -157,3 +157,44 @@ def test_shape_invalid_422(client):
     for err in body.get("detail", []):
         assert "input" not in err
         assert "ctx" not in err
+
+
+# --------------------------------------------------------------------------- #
+# US-003: 3 niveluri in raspunsul /valideaza                                  #
+# --------------------------------------------------------------------------- #
+
+def test_erori_au_3niveluri(client):
+    """/valideaza cu VIN invalid -> erori[i] au cod/problema/cauza/fix (pass-through US-002)."""
+    r = client.post("/v1/prezentari/valideaza", json=_body_v(vin="WVWZZZ1OZIQ45678"))
+    assert r.status_code == 200
+    res = r.json()["results"][0]
+    assert res["status_estimat"] == "needs_data"
+    erori = res["erori"]
+    assert len(erori) >= 1
+    for e in erori:
+        assert "cod" in e, f"lipseste 'cod' in {e}"
+        assert "problema" in e, f"lipseste 'problema' in {e}"
+        assert "cauza" in e, f"lipseste 'cauza' in {e}"
+        assert "fix" in e, f"lipseste 'fix' in {e}"
+
+
+def test_nemapate_au_3niveluri(client):
+    """/valideaza cu cod_op nemapat -> nemapate[i] au cod_op_service+denumire PASTRATE
+    + cod==COD_NEMAPAT + cele 3 niveluri."""
+    prez = _prez()
+    prez["prestatii"] = [{"cod_op_service": "OP_TEST_NEMAPAT", "denumire": "Operatie test"}]
+    r = client.post("/v1/prezentari/valideaza", json={"prezentari": [prez]})
+    assert r.status_code == 200
+    res = r.json()["results"][0]
+    assert res["status_estimat"] == "needs_mapping"
+    nemapate = res["nemapate"]
+    assert len(nemapate) == 1
+    n = nemapate[0]
+    # Campuri originale pastrate
+    assert n["cod_op_service"] == "OP_TEST_NEMAPAT"
+    assert n["denumire"] == "Operatie test"
+    # 3 niveluri adaugate
+    assert n["cod"] == "COD_NEMAPAT"
+    assert n["problema"]
+    assert n["cauza"]
+    assert n["fix"]