{# 🔭 관련 신호 wrapper. Outer section is omitted when no subsection has
   content so the heading never appears on its own. Subsections (pgvector
   similarity + signal alerts + track_history timeline) are independently
   omitted by their own partials when their lists are empty.

   ARG-208: Keep assets replace the 새 신호 + 최근 변화 subsections with the
   unified _timeline.html fragment (same one the portfolio card accordion
   uses). fetch_item_detail leaves signal_alerts/related_history empty for
   Keep assets, so this is a straight swap, not a case split on those lists.

   The Keep vs non-Keep branch keys off item.is_timeline_view (asset status),
   NOT item.timeline emptiness: a freshly-Keep'd asset has no track_history
   yet, so its timeline is empty — but it must still render the timeline
   fragment's own empty-state ("아직 추적 이벤트가 없습니다"), not fall back to
   the (always empty for Keep) subsections or drop the whole section
   (ARG-208 codex P2). Non-Keep/non-asset items have is_timeline_view false,
   so the original subsections render exactly as before (AC2). #}
{% set has_similar = item.similar %}
{% set is_timeline = item.is_timeline_view %}
{% set has_alerts = item.signal_alerts %}
{% set has_history = item.related_history %}
{% if has_similar or is_timeline or has_alerts or has_history %}
<section class="detail-signals">
  <h2 class="detail-section__title">🔭 관련 신호</h2>
  {% include "_detail_similarity.html" %}
  {% if is_timeline %}
  {% set events = item.timeline %}
  {% include "_timeline.html" %}
  {% else %}
  {% include "_detail_new_signals.html" %}
  {% include "_detail_history.html" %}
  {% endif %}
</section>
{% endif %}