feat: Phase 4 — viewer enrichi, non-cumul CCAM, fusion multi-PDFs + rebuild FAISS (21 141 vecteurs)

- Viewer : badges compteurs (DAS, actes, alertes, CMA), raisonnement LLM pliable, regroupement CCAM, navigation patient, alertes NON-CUMUL en rouge
- Non-cumul CCAM : 3 règles heuristiques (même base, même regroupement/jour, paires incompatibles)
- Fusion multi-PDFs : merge_dossiers() avec priorité Trackare, spécificité CIM-10, déduplication, champ source_files
- Index FAISS reconstruit : 21 141 vecteurs (CCAM dict 8 257 + CIM-10 alpha 306)
- 192 tests unitaires passent

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_viewer.py

@@ -0,0 +1,94 @@
+"""Tests pour le viewer Flask."""
+
+import pytest
+
+from src.viewer.app import create_app, compute_group_stats, severity_badge
+from src.config import DossierMedical, Diagnostic, ActeCCAM
+
+
+@pytest.fixture
+def app():
+    app = create_app()
+    app.config["TESTING"] = True
+    return app
+
+
+@pytest.fixture
+def client(app):
+    return app.test_client()
+
+
+class TestGroupStats:
+    def test_group_stats(self):
+        items = [
+            {
+                "dossier": DossierMedical(
+                    diagnostics_associes=[
+                        Diagnostic(texte="HTA", cim10_suggestion="I10"),
+                        Diagnostic(texte="Diabète", cim10_suggestion="E11.9", est_cma=True),
+                    ],
+                    actes_ccam=[
+                        ActeCCAM(texte="Cholé", code_ccam_suggestion="HMFC004"),
+                    ],
+                    alertes_codage=["Alerte 1", "Alerte 2"],
+                ),
+            },
+            {
+                "dossier": DossierMedical(
+                    diagnostics_associes=[
+                        Diagnostic(texte="Obésité", cim10_suggestion="E66.0"),
+                    ],
+                    actes_ccam=[
+                        ActeCCAM(texte="TDM", code_ccam_suggestion="ZCQK002"),
+                    ],
+                    alertes_codage=[],
+                ),
+            },
+        ]
+        stats = compute_group_stats(items)
+        assert stats["das_count"] == 3
+        assert stats["actes_count"] == 2
+        assert stats["alertes_count"] == 2
+        assert stats["cma_count"] == 1
+
+    def test_group_stats_empty(self):
+        stats = compute_group_stats([])
+        assert stats["das_count"] == 0
+        assert stats["alertes_count"] == 0
+
+
+class TestSeverityBadgeFilter:
+    def test_severe(self):
+        result = severity_badge("severe")
+        assert "Sévère" in result
+        assert "#dc2626" in result
+
+    def test_modere(self):
+        result = severity_badge("modere")
+        assert "Modéré" in result
+
+    def test_leger(self):
+        result = severity_badge("leger")
+        assert "Léger" in result
+
+    def test_none(self):
+        result = severity_badge(None)
+        assert result == ""
+
+    def test_unknown(self):
+        result = severity_badge("inconnu")
+        assert result == ""
+
+
+class TestIndexPageLoads:
+    def test_index_page_loads(self, client):
+        response = client.get("/")
+        assert response.status_code == 200
+        assert b"Dossiers" in response.data
+
+
+class TestDetailPageLoads:
+    def test_detail_page_404(self, client):
+        """Un fichier inexistant retourne 404."""
+        response = client.get("/dossier/nonexistent.json")
+        assert response.status_code == 404