fix: PeopleView 从 cluster 数据提取 trace_ids 和 representative_trace

- 构建 faceIdToTraceId 映射
- 从 representative_face.face_id 找到 trace_id
- 为每个 cluster 设置 trace_ids 字段
- 设置 representative_trace 字段
- 修复 group 缩略图无法显示的问题

src/views/PeopleView.vue

@@ -2056,6 +2056,8 @@ async function loadClusterResults() {
     }
     // Build cluster_id → faces[] mapping from frames
     const clusterFacesMap: Record<string, any[]> = {}
+    const clusterTraceIdsMap: Record<string, Set<number>> = {}
+    const faceIdToTraceId: Record<string, number> = {}
     for (const f of frames) {
       for (const face of (f.faces || [])) {
         const cid = face.cluster_id
@@ -2066,15 +2068,35 @@ async function loadClusterResults() {
           frame: f.frame,
           timestamp: f.timestamp,
           confidence: face.confidence,
-          cluster_id: cid
+          cluster_id: cid,
+          trace_id: face.trace_id
         })
+        if (face.trace_id !== undefined && face.trace_id !== null) {
+          if (!clusterTraceIdsMap[cid]) clusterTraceIdsMap[cid] = new Set()
+          clusterTraceIdsMap[cid].add(face.trace_id)
+          if (face.face_id) {
+            faceIdToTraceId[face.face_id] = face.trace_id
+          }
+        }
       }
     }
-    // Assign faces to each cluster
+    // Assign faces and trace_ids to each cluster
     for (const c of groups) {
       const cid = c.cluster_id || c.group_id
       c.member_faces = clusterFacesMap[cid] || []
       c.face_count = c.member_faces.length
+      c.trace_ids = Array.from(clusterTraceIdsMap[cid] || [])
+      // Set representative_trace from representative_face
+      if (c.representative_face?.face_id) {
+        const repTraceId = faceIdToTraceId[c.representative_face.face_id]
+        if (repTraceId !== undefined) {
+          c.representative_trace = repTraceId
+        }
+      }
+      // Fallback to first trace_id
+      if (c.representative_trace === undefined && c.trace_ids.length > 0) {
+        c.representative_trace = c.trace_ids[0]
+      }
     }
     if (groups.length) {
       setClusterResults(fileUuid, groups)