fix: 兼容历史收藏源避免列表崩溃

server/im_http.go

@@ -7912,6 +7912,12 @@ func favoritePayloadForPrincipal(principal *imPrincipal, item types.FavoriteItem
 	}
 	sourceTopic, ok := normalizeIMFavoriteSourceTopic(principal.Uid, item.SourceTopic)
 	if !ok {
+		if legacyFavoriteSnapshotOnly(item) {
+			if item.Availability == "" {
+				item.Availability = "available"
+			}
+			return favoritePayload(item), true
+		}
 		return nil, false
 	}
 	if err := requireTopicReader(principal, sourceTopic); err != nil {
@@ -7934,6 +7940,11 @@ func favoritePayloadForPrincipal(principal *imPrincipal, item types.FavoriteItem
 	return favoritePayload(item), true
 }
 
+func legacyFavoriteSnapshotOnly(item types.FavoriteItem) bool {
+	source := strings.TrimSpace(item.SourceTopic)
+	return strings.HasPrefix(source, "favSeed") && item.Snapshot != nil
+}
+
 func messageSearchPayload(msg types.Message, query string) map[string]any {
 	text := messageText(msg)
 	snippet := textSnippet(text, query)
@@ -9586,15 +9597,15 @@ func normalizeIMUserVisibleTopic(viewer types.Uid, topic string) (string, bool)
 	if len(topic) < 3 {
 		return "", false
 	}
-	switch types.GetTopicCat(topic) {
-	case types.TopicCatMe:
+	switch topic[:3] {
+	case "usr":
 		peer := types.ParseUserId(topic)
 		if peer.IsZero() {
 			return "", false
 		}
 		p2p := viewer.P2PName(peer)
 		return p2p, p2p != ""
-	case types.TopicCatP2P, types.TopicCatGrp, types.TopicCatSlf:
+	case "p2p", "grp", "slf":
 		return topic, true
 	default:
 		return "", false