T5 furniture and poses in IMVU rooms (decorations)

Community products are taken out of rooms their owners save and broadcast, kept on the hub per room,
and added back when anyone with T5DE loads the room or gets its owner's broadcast; the hub's decor
notice resends the room with the new ones. Placements are stored with the hub's product ID.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/hub/hub.go

@@ -180,6 +180,8 @@ type Client struct {
 	OnConnect func()
 	// OnRoom, if set, gets the hub's messages about hosted rooms ("room.*"), as sent.
 	OnRoom func(data []byte)
+	// OnDecor, if set, hears that an IMVU room's decorations changed (its instance ID).
+	OnDecor func(room string)
 
 	mu     sync.Mutex
 	saved  *Saved
@@ -343,8 +345,8 @@ func (c *Client) connect(ctx context.Context) error {
 				continue
 			}
 			var m struct {
-				Type, Message, Chat string
-				Avatars             []Avatar
+				Type, Message, Chat, Room string
+				Avatars                   []Avatar
 			}
 			if json.Unmarshal(data, &m) != nil {
 				continue
@@ -352,6 +354,10 @@ func (c *Client) connect(ctx context.Context) error {
 			switch m.Type {
 			case "error":
 				c.log.Printf("hub: %s", m.Message)
+			case "decor":
+				if c.OnDecor != nil && m.Room != "" {
+					go c.OnDecor(m.Room)
+				}
 			case "library":
 				if c.OnLibrary != nil {
 					go c.OnLibrary()