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]>

internal/products/products.go

@@ -50,6 +50,13 @@ type Products struct {
 
 	// Want, if set, is asked for products someone in a room wears that aren't here (the fetcher gets hub products).
 	Want func(id string)
+	// HubDir is the pack root of products from the hub; of those, only ones Owned says are in the person's library
+	// are in the inventory (the rest are there because someone in a room wears them). Local packs always are.
+	HubDir string
+	Owned  func(id string) bool
+	// OnHide, if set, hears that the person hid a community product in the inventory (removing it from their
+	// library, for hub products).
+	OnHide func(id string)
 
 	roomMu sync.Mutex
 	room   room
@@ -204,7 +211,7 @@ func (p *Products) loadLocked(dir, fp string) (*served, error) {
 	if err != nil {
 		return nil, err
 	}
-	local, err := p.state.localID(pk.Manifest.ID)
+	local, err := p.state.localID(versionKey(pk))
 	if err != nil {
 		return nil, err
 	}
@@ -224,6 +231,15 @@ func (p *Products) loadLocked(dir, fp string) (*served, error) {
 	return &served{dir: dir, fingerprint: fp, pack: pk, local: local, cfl: buf.Bytes(), checksum: hex.EncodeToString(sum[:])}, nil
 }
 
+// versionKey names a version of a product for its local ID: the revision and the info the client shows. The client
+// keeps product info for good (its product info cache), so a product whose files or info changed gets a new local
+// ID, and with it fresh info.
+func versionKey(pk *pack.Pack) string {
+	m := pk.Manifest
+	sum := md5.Sum([]byte(strings.Join([]string{m.Name, m.Creator, m.Rating}, "|")))
+	return fmt.Sprintf("%s@%d.%s", m.ID, m.Revision, hex.EncodeToString(sum[:4]))
+}
+
 // fingerprint changes when anything in the pack directory (or its files/ directory) changes.
 func fingerprint(dir string) string {
 	var b strings.Builder