feat(chat): save and view chat history — admin-only saved_chats, History page, open-a-chat return

tests/integration/test_api.py

@@ -88,6 +88,7 @@ def test_suggestions_honors_bor_suggestions_env_override(monkeypatch) -> None:
         ("/login.html", "Sign in"),  # phase 16: admin sign-in page
         ("/tuning.html", "Global Tuning"),  # phase 27: global tuning page
         ("/git-sources.html", "Git sources"),  # phase 35: admin git sources page
+        ("/history.html", "Saved chats"),  # phase 50: admin saved-chats page
     ],
 )
 def test_html_pages_served_locally_no_cdn(client, path: str, marker: str) -> None:
@@ -124,7 +125,8 @@ def test_index_page_no_cache_with_versioned_asset_refs(client) -> None:
 
 @pytest.mark.parametrize(
     "path",
-    ["/sources.html", "/document.html", "/login.html", "/tuning.html", "/git-sources.html"],
+    ["/sources.html", "/document.html", "/login.html", "/tuning.html",
+     "/git-sources.html", "/history.html"],  # phase 50: + the History page
 )
 def test_html_pages_no_cache_with_versioned_refs(client, path: str) -> None:
     """Each of the other four pages revalidates and carries at least one