feat(ai): section Fournisseur & modele compacte + correctifs menus @/ (#82, BUG-007, BUG-008)

Refonte de la section Fournisseur & modele de l'assistant : capacites regroupees dans une bulle d'information (survol/clic/appui long) au lieu d'une liste permanente, et liste de modeles avec recherche. Correctifs : detection Unicode + filtrage insensible aux accents des commandes / et mentions @, navigation clavier fiable, et prise en compte du contexte ad-hoc en mode General cote backend.

tests/test_bookslm.py

@@ -747,6 +747,56 @@ class TestBooksLMChatModes:
         assert resp.status_code in (200, 500), f"unexpected {resp.status_code}: {resp.text[:200]}"
         assert resp.status_code != 422
 
+    def test_general_chat_includes_adhoc_files(self, bookslm_client, monkeypatch):
+        """`@` ad-hoc files must be read even in General mode (BUG-008)."""
+        import backend.bookslm_routes as routes
+
+        captured = {}
+
+        async def fake_stream(messages, **kwargs):
+            captured["messages"] = messages
+            yield "ok"
+
+        monkeypatch.setattr(routes, "stream_completion", fake_stream)
+        monkeypatch.setattr(routes, "_resolve_provider_name", lambda requested: "deepseek")
+
+        token, _ = _login_bookslm(bookslm_client)
+        resp = bookslm_client.post(
+            "/api/ai/bookslm/chat",
+            json={
+                "mode": "general",
+                "vault": "TestVault",
+                "extra_files": ["notes/note1.md"],
+                "message": "Résume",
+            },
+            headers={"Authorization": f"Bearer {token}"},
+        )
+        assert resp.status_code == 200, resp.text[:200]
+        system_prompt = captured["messages"][0]["content"]
+        assert "First note content" in system_prompt, "ad-hoc file content missing from prompt"
+
+    def test_general_chat_without_adhoc_ignores_vault(self, bookslm_client, monkeypatch):
+        """General mode without ad-hoc context stays vault-independent."""
+        import backend.bookslm_routes as routes
+
+        captured = {}
+
+        async def fake_stream(messages, **kwargs):
+            captured["messages"] = messages
+            yield "ok"
+
+        monkeypatch.setattr(routes, "stream_completion", fake_stream)
+        monkeypatch.setattr(routes, "_resolve_provider_name", lambda requested: "deepseek")
+
+        token, _ = _login_bookslm(bookslm_client)
+        resp = bookslm_client.post(
+            "/api/ai/bookslm/chat",
+            json={"mode": "general", "vault": "UnknownVault", "message": "Bonjour"},
+            headers={"Authorization": f"Bearer {token}"},
+        )
+        assert resp.status_code == 200, resp.text[:200]
+        assert captured["messages"][0]["content"]
+
 
 # ── Tool-calling agent endpoint ───────────────────────────────────────