fix(chat): simplify header cards and llm fallback

tests/test_chat.py

@@ -526,7 +526,7 @@ def test_chat_page_shows_upload_entry_and_dynamic_context_cards(client, db):
     assert "飞书通知 / 待处理" in content
 
 
-def test_chat_page_shows_top_context_and_recommended_prompts(client, db):
+def test_chat_page_keeps_prompts_inside_chat_thread_without_top_cards(client, db):
     batch, conversation = _create_conversation_with_batch()
     conversation.task_status = "processing"
     conversation.node_results = [
@@ -545,13 +545,10 @@ def test_chat_page_shows_top_context_and_recommended_prompts(client, db):
 
     content = response.content.decode("utf-8")
     assert response.status_code == 200
-    assert "顶部对话上下文" in content
-    assert "当前流程类型" in content
-    assert "registration" in content
-    assert "当前审核阶段" in content
+    assert "顶部对话上下文" not in content
+    assert "推荐提问模板" not in content
+    assert "对话区与节点导航" in content
     assert "处理中" in content
-    assert "当前最高风险等级" in content
-    assert "推荐提问模板" in content
     assert "请汇总当前资料包的章节点、页数和目录覆盖情况" in content
     assert "请给出当前资料包的高风险项、责任人和整改建议" in content
 
@@ -583,16 +580,12 @@ def test_chat_page_explicitly_shows_batch_product_stage_and_export_context(clien
     assert f"批次：{batch.batch_id}" in content
     assert f"产品：{batch.product_name}" in content
     assert "阶段：处理中" in content
-    assert "批次编号" in content
-    assert batch.batch_id in content
-    assert "产品名称" in content
-    assert batch.product_name in content
-    assert "当前审核阶段" in content
-    assert "处理中" in content
-    assert "当前最高风险等级" in content
-    assert ">高<" in content
+    assert "批次编号" not in content
+    assert "当前审核阶段" not in content
+    assert "最高风险等级" in content
+    assert "高" in content
     assert "是否允许正式导出" in content
-    assert ">否<" in content
+    assert "否" in content
 
 
 def test_chat_page_shows_overview_card_from_conversation_summary(client, db):