fix: compose named cockpit modes from capabilities

tests/e2e/test_assistant_web_api.py

@@ -178,6 +178,7 @@ class FakeVehicleService:
     def __init__(self) -> None:
         self.calls: list[dict[str, object]] = []
         self.mode_save_calls: list[dict[str, object]] = []
+        self.mode_trial_calls: list[dict[str, object]] = []
         self.fail = False
 
     def preview_native_can(self, **kwargs: object) -> dict[str, object]:
@@ -286,6 +287,7 @@ class FakeVehicleService:
                 "conversation_id": kwargs["conversation_id"],
                 "status": "succeeded",
                 "execution_mode": "dry_run",
+                "hardware_execution_allowed": False,
                 "supplement_required": False,
                 "orchestration_route": "mode_profile_create_preview",
                 "mode_profile_draft": {
@@ -361,6 +363,31 @@ class FakeVehicleService:
             "source_request_id": source_request_id,
         }
 
+    def trial_mode_profile_draft(
+        self,
+        name: str,
+        instruction: str,
+        source_request_id: str,
+        vehicle_id: str | None = None,
+    ) -> dict[str, object]:
+        self.mode_trial_calls.append(
+            {
+                "name": name,
+                "instruction": instruction,
+                "source_request_id": source_request_id,
+                "vehicle_id": vehicle_id,
+            }
+        )
+        return {
+            "request_id": source_request_id,
+            "status": "succeeded",
+            "execution_mode": "dry_run",
+            "hardware_execution_allowed": False,
+            "orchestration_route": "mode_profile_draft_trial",
+            "intent_ir": {"spec": {"actions": []}},
+            "function_configs": {},
+        }
+
 
 def _auth_disabled() -> AuthRuntime:
     return AuthRuntime(AuthConfig(False, "", "", b"", 3600, 5, 300, 120, False))
@@ -402,6 +429,7 @@ class TestCodexAssistantWebApi:
     def setup_method(self) -> None:
         AssistantApiHandler.service.calls.clear()
         AssistantApiHandler.service.mode_save_calls.clear()
+        AssistantApiHandler.service.mode_trial_calls.clear()
         AssistantApiHandler.service.fail = False
         FAKE_CODEX.available = True
         FAKE_CODEX.turn_calls.clear()
@@ -636,6 +664,32 @@ class TestCodexAssistantWebApi:
         assert "预览" in events[-1]["answer"]
         assert "已添加" not in events[-1]["answer"]
 
+    def test_mode_draft_trial_reuses_the_server_owned_preview(self) -> None:
+        status, content_type, payload = self._request_json(
+            "/api/mode-profile-drafts/trial",
+            {
+                "name": "午休模式",
+                "instruction": "进入午休模式",
+                "source_request_id": "req-api-mode-trial",
+                "vehicle_id": "denza_n7",
+            },
+        )
+
+        assert status == 200
+        assert content_type == "application/json"
+        assert payload["status"] == "succeeded"
+        assert payload["execution_mode"] == "dry_run"
+        assert payload["hardware_execution_allowed"] is False
+        assert payload["orchestration_route"] == "mode_profile_draft_trial"
+        assert AssistantApiHandler.service.mode_trial_calls == [
+            {
+                "name": "午休模式",
+                "instruction": "进入午休模式",
+                "source_request_id": "req-api-mode-trial",
+                "vehicle_id": "denza_n7",
+            }
+        ]
+
     def test_exact_movie_mode_request_streams_a_nine_action_preview(self) -> None:
         events = self.post_assistant(
             {