feat: frontend turn_html_replace SSE handler for regenerate live-swap (T86)

tests/test_turn_common.py

@@ -104,10 +104,16 @@ def test_read_recent_dialogue_returns_chronological_pairs(tmp_path):
     with open_db(db) as conn:
         out = read_recent_dialogue(conn, "chat_a", limit=10)
 
-    assert out == [
-        {"speaker": "you", "text": "hello"},
-        {"speaker": "bot_a", "text": "Original."},
+    # Each entry now carries the source ``event_log.id`` as ``event_id``
+    # (T86 follow-up) so the chat-detail Jinja loop can stamp
+    # ``id="turn-<n>"`` on each rendered turn DIV — needed by the
+    # ``turn_html_replace`` SSE handler for in-place regenerate swaps.
+    speakers = [(e["speaker"], e["text"]) for e in out]
+    assert speakers == [
+        ("you", "hello"),
+        ("bot_a", "Original."),
     ]
+    assert all("event_id" in e and isinstance(e["event_id"], int) for e in out)
 
 
 def test_read_recent_dialogue_filters_superseded_and_other_chats(tmp_path):