T5 products in the client's inventory

The inventory's product list (test.showInventory) gets the community products the person has: local packs, and
hub products in their library. Hiding one is answered by the proxy (and removes a hub product from the library).
When the library changes, the client is told to load its inventory again, with the server event IMVU sends
after a purchase. A product whose revision or info changes gets a new local ID, since the client keeps product
info for good; names lose characters the client's pages could take as HTML.

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

cmd/t5de-proxy/main.go

@@ -145,7 +145,18 @@ func run(logger *log.Logger, listen, ready string, parentPID int, trace bool, pa
 			prods.Observer = client
 			client.OnChat = prods.Others
 			fetcher.OnReady = prods.Ready
+			fetcher.OnLibrary = prods.RefreshInventory
 			prods.Want = fetcher.Want
+			prods.HubDir, prods.Owned = hubProducts, fetcher.Owned
+			prods.OnHide = func(id string) {
+				if fetch.IsHubID(id) {
+					go func() {
+						if err := client.Call(context.Background(), "DELETE", "/api/v1/library/"+id, nil, nil); err != nil {
+							logger.Printf("hub: removing %s from the library: %v", id, err)
+						}
+					}()
+				}
+			}
 		}
 		client.OnLibrary = func() { fetcher.SyncLibrary(context.Background()) }
 		go client.Run(context.Background())