Phase 3 : hardening qualite de code - typage strict, securite, dead code, a11y

Config strictement stricte partout (ruff, mypy --strict, bandit, vulture,
import-linter, eslint, stylelint), aucune regle desactivee "pour ne pas
casser le build" - l'existant a ete corrige pour la satisfaire plutot que
l'inverse. Hooks pre-commit locaux (language: system) bloquants.

- Typage mypy --strict propage a tout le moteur (db, screens, auth, core,
  ai, routes, puis publish/scripts/tests/app.py/build_css.py).
- Securite : fuite de handle fichier Windows corrigee dans l'export SCORM
  (routes/publish/export_scorm.py), CSRF/RNG non-crypto/xAPI documentes
  (# nosec, # NOSONAR justifies), nouveau db.json_for_script() (echappe
  "</script>" dans le JSON embarque en <script>, 25 sites).
- Architecture : imports circulaires/F811 nettoyes, contrats
  import-linter respectes, code mort retire (vulture).
- Accessibilite : 69 champs de formulaire sans label correctement
  associe corriges (for/id ou aria-label) sur 11 templates.
- ESLint/Stylelint : lot mecanique JS/CSS, regles ajustees puis
  appliquees (aucune desactivee sans verification individuelle).
- Tests : isolation du compte admin partage (nettoyage ponctuel +
  fixture de teardown automatique en filet de securite), suite complete
  verte (591 tests Python, 241 tests JS).
- SonarQube Community Build self-heberge (Docker + PostgreSQL) : rapport
  complet analyse point par point, faux positifs documentes.
- .gitattributes ajoute (LF force) : core.autocrlf=true sur cette machine
  faisait echouer ESLint (linebreak-style) via un bug connu de git
  (checkout "en place" qui ignore l'eol force sur un fichier deja
  present sur disque - contourne en supprimant puis recreant chaque
  fichier suivi).

djLint (H021, styles inline) volontairement saute pour ce commit -
backlog assume, deja documente, traite dans un lot separe.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/test_condition_variable.py

@@ -10,28 +10,38 @@ scalaire, objet avec chemin chaîné, tableau par index, variable
 introuvable (ne matche rien plutôt que planter), booléen "Oui", et clause
 sans "source" (comportement legacy, champ d'objet) — les 7 scénarios
 passent."""
+
 import json
 import re
+from typing import Any
+
+from flask.testing import FlaskClient
 
 import db
+from tests.conftest import not_none
 
 
-def _create_screen(client, slug, name="Accueil"):
+def _create_screen(client: FlaskClient, slug: str, name: str = "Accueil") -> Any:
     resp = client.post(f"/game/{slug}/screens/new", data={"name": name}, follow_redirects=False)
-    return int(re.search(r"/screens/(\d+)/edit", resp.headers["Location"]).group(1))
+    return int(not_none(re.search(r"/screens/(\d+)/edit", resp.headers["Location"])).group(1))
 
 
-def test_condition_node_stores_variable_source(client, game):
+def test_condition_node_stores_variable_source(client: FlaskClient, game: str) -> None:
     client.post(f"/game/{game}/variables/new", data={"name": "score", "type": "nombre_entier", "default_value": "5"})
     screen_id = _create_screen(client, game)
 
     resp = client.post(
         f"/game/{game}/screens/{screen_id}/flow/nodes/add",
-        data=json.dumps({
-            "node_type": "condition", "cond_source": "variable",
-            "cond_variable": "score", "cond_variable_chemin": "",
-            "cond_operator": "superieur_egal", "cond_value": "3",
-        }),
+        data=json.dumps(
+            {
+                "node_type": "condition",
+                "cond_source": "variable",
+                "cond_variable": "score",
+                "cond_variable_chemin": "",
+                "cond_operator": "superieur_egal",
+                "cond_value": "3",
+            }
+        ),
         content_type="application/json",
     )
     assert resp.status_code == 200
@@ -44,21 +54,32 @@ def test_condition_node_stores_variable_source(client, game):
     assert node["cond_field"] is None
 
 
-def test_condition_node_with_combined_variable_and_object_clauses(client, game):
+def test_condition_node_with_combined_variable_and_object_clauses(client: FlaskClient, game: str) -> None:
     client.post(f"/game/{game}/variables/new", data={"name": "score", "type": "nombre_entier", "default_value": "5"})
     def_id = db.create_definition(game, "Niveau", [{"name": "numero", "type": "nombre_entier"}])
     screen_id = _create_screen(client, game)
 
     clauses = [
         {"source": "variable", "variable": "score", "operator": "superieur_egal", "value": "3"},
-        {"source": "objet", "definition_id": def_id, "row_id": None, "field": "numero",
-         "field_type": "nombre_entier", "operator": "egal", "value": "1"},
+        {
+            "source": "objet",
+            "definition_id": def_id,
+            "row_id": None,
+            "field": "numero",
+            "field_type": "nombre_entier",
+            "operator": "egal",
+            "value": "1",
+        },
     ]
     resp = client.post(
         f"/game/{game}/screens/{screen_id}/flow/nodes/add",
-        data=json.dumps({
-            "node_type": "condition", "cond_clauses": json.dumps(clauses), "cond_combinator": "ou",
-        }),
+        data=json.dumps(
+            {
+                "node_type": "condition",
+                "cond_clauses": json.dumps(clauses),
+                "cond_combinator": "ou",
+            }
+        ),
         content_type="application/json",
     )
     assert resp.status_code == 200
@@ -69,10 +90,12 @@ def test_condition_node_with_combined_variable_and_object_clauses(client, game):
     assert node["cond_combinator"] == "ou"
 
 
-def test_runtime_payload_exposes_global_variables_for_condition_evaluation(client, game):
+def test_runtime_payload_exposes_global_variables_for_condition_evaluation(client: FlaskClient, game: str) -> None:
     client.post(f"/game/{game}/variables/new", data={"name": "score", "type": "nombre_entier", "default_value": "5"})
-    client.post(f"/game/{game}/variables/new", data={"name": "perso", "type": "objet",
-                                                       "default_value": json.dumps({"nom": "Alice"})})
+    client.post(
+        f"/game/{game}/variables/new",
+        data={"name": "perso", "type": "objet", "default_value": json.dumps({"nom": "Alice"})},
+    )
     payload = client.get(f"/game/{game}/runtime-payload").get_json()
     assert payload["variables"]["score"] == {"value": "5", "type": "nombre_entier"}
     assert payload["variables"]["perso"]["type"] == "objet"