Fix contract linkage and persist related project groups

templates/base.html

@@ -477,7 +477,7 @@
     <nav class="nav">
         <a href="/" class="{% if request.url.path == '/' %}active{% endif %}">대시보드</a>
         <a href="/projects" class="{% if request.url.path == '/projects' %}active{% endif %}">프로젝트 정보</a>
-        <a href="/annual-summary" class="{% if request.url.path == '/annual-summary' %}active{% endif %}">연도별 수익 비용 정리</a>
+        <a href="/annual-summary" class="{% if request.url.path == '/annual-summary' %}active{% endif %}">연도별 수익/비용</a>
         <div class="nav-spacer"></div>
         <aside
             class="sync-status"
@@ -496,6 +496,7 @@
                 <div>마지막 확인: <strong id="syncLastChecked">-</strong></div>
                 <div>서버 시간: <strong id="syncServerTime">{{ server_time or '-' }}</strong></div>
                 <div>데이터 버전: <strong id="syncDataVersion">{{ data_version or '-' }}</strong></div>
+                <div>계약/청구 동기화: <strong>{{ import_sync_summary.contract_project_count or 0 }}</strong> / <strong>{{ import_sync_summary.billing_project_count or 0 }}</strong></div>
             </div>
         </aside>
     </nav>