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_validation.py

@@ -137,3 +137,114 @@ def test_b64image_valid_ok():
 def test_erori_multiple_cumulate():
     errors = validate_prezentare(_base(vin="BAD", nr_inmatriculare="X-Y", data_prestatie="2024-01-01"))
     assert {"vin", "nr_inmatriculare", "data_prestatie"} <= _fields(errors)
+
+
+# ---------------------------------------------------------------------------
+# US-002: 3 niveluri — coduri stabile, forma aditiva, back-compat
+# ---------------------------------------------------------------------------
+
+from app import errors as err_mod  # noqa: E402
+
+
+def test_vin_invalid_are_3niveluri():
+    """VIN cu O/I/Q => eroarea are cod, problema, fix, field, message neschimbat."""
+    errs = validate_prezentare(_base(vin="WVWZZZ1OZAW000123"))
+    vin_errs = [e for e in errs if e.get("field") == "vin"]
+    assert vin_errs, "Trebuie cel putin o eroare cu field==vin"
+    e = vin_errs[0]
+    assert e["cod"] == "VIN_FORMAT"
+    assert e["problema"], "problema trebuie sa fie ne-goala"
+    assert e["fix"], "fix trebuie sa fie ne-gol"
+    assert e["field"] == "vin"
+    # message trebuie sa fie mesajul existent (back-compat)
+    assert "17" in e["message"] or "O, I, Q" in e["message"]
+
+
+def test_data_prea_veche_cod():
+    errs = validate_prezentare(_base(data_prestatie="2024-11-30"))
+    dp = [e for e in errs if e.get("field") == "data_prestatie"]
+    assert dp
+    assert dp[0]["cod"] == "DATA_PREA_VECHE"
+
+
+def test_data_viitor_cod():
+    from datetime import timedelta
+    maine = (today_bucuresti() + timedelta(days=1)).isoformat()
+    errs = validate_prezentare(_base(data_prestatie=maine))
+    dp = [e for e in errs if e.get("field") == "data_prestatie"]
+    assert dp
+    assert dp[0]["cod"] == "DATA_VIITOR"
+
+
+def test_data_format_cod():
+    errs = validate_prezentare(_base(data_prestatie="15-06-2026"))
+    dp = [e for e in errs if e.get("field") == "data_prestatie"]
+    assert dp
+    assert dp[0]["cod"] == "DATA_FORMAT"
+
+
+def test_odometru_initial_lipsa_cod():
+    errs = validate_prezentare(_base(prestatii=[{"cod_prestatie": "R-ODO"}]))
+    oi = [e for e in errs if e.get("field") == "odometru_initial"]
+    assert oi
+    assert oi[0]["cod"] == "ODOMETRU_INITIAL_LIPSA"
+
+
+def test_odometru_ordine_cod():
+    c = _base(prestatii=[{"cod_prestatie": "R-ODO"}], odometru_initial="200000", odometru_final="100000")
+    errs = validate_prezentare(c)
+    oi = [e for e in errs if e.get("field") == "odometru_initial" and e.get("cod") == "ODOMETRU_INITIAL_ORDINE"]
+    assert oi, "Trebuie eroare cu cod ODOMETRU_INITIAL_ORDINE"
+
+
+def test_prestatii_goale_cod():
+    errs = validate_prezentare(_base(prestatii=[]))
+    pr = [e for e in errs if e.get("field") == "prestatii"]
+    assert pr
+    assert pr[0]["cod"] == "PRESTATII_GOALE"
+
+
+def test_b64_invalid_cod():
+    errs = validate_prezentare(_base(b64_image="@@@not-base64@@@"))
+    b = [e for e in errs if e.get("field") == "b64_image"]
+    assert b
+    assert b[0]["cod"] == "B64_INVALID"
+
+
+def test_back_compat_field_message():
+    """Fiecare eroare are inca field + message (forma veche)."""
+    errs = validate_prezentare(_base(
+        vin="BAD",
+        nr_inmatriculare="X-Y",
+        data_prestatie="2024-01-01",
+        odometru_final="abc",
+        prestatii=[],
+    ))
+    for e in errs:
+        assert "field" in e, f"Lipseste 'field' in {e}"
+        assert "message" in e, f"Lipseste 'message' in {e}"
+        assert e["message"], f"'message' gol in {e}"
+
+
+def test_toate_codurile_in_catalog():
+    """Fiecare cod emis de validate_prezentare exista in errors.CATALOG."""
+    from datetime import timedelta
+
+    cazuri = [
+        _base(vin="WVWZZZ1OZAW000123"),                         # VIN_FORMAT
+        _base(nr_inmatriculare="X-Y"),                           # NR_INMATRICULARE_FORMAT
+        _base(data_prestatie="15-06-2026"),                      # DATA_FORMAT
+        _base(data_prestatie="2024-11-30"),                      # DATA_PREA_VECHE
+        _base(data_prestatie=(today_bucuresti() + timedelta(days=1)).isoformat()),  # DATA_VIITOR
+        _base(odometru_final="abc"),                             # ODOMETRU_FINAL_FORMAT
+        _base(prestatii=[{"cod_prestatie": "R-ODO"}]),           # ODOMETRU_INITIAL_LIPSA
+        _base(prestatii=[{"cod_prestatie": "R-ODO"}], odometru_initial="abc"),     # ODOMETRU_INITIAL_FORMAT
+        _base(prestatii=[{"cod_prestatie": "R-ODO"}], odometru_initial="200000", odometru_final="100000"),  # ODOMETRU_INITIAL_ORDINE
+        _base(prestatii=[]),                                     # PRESTATII_GOALE
+        _base(b64_image="@@@not-base64@@@"),                     # B64_INVALID
+    ]
+    for caz in cazuri:
+        errs = validate_prezentare(caz)
+        for e in errs:
+            if "cod" in e:
+                assert e["cod"] in err_mod.CATALOG, f"Cod {e['cod']!r} absent din CATALOG"