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/state.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+	"strings"
 	"sync"
 )
 
@@ -157,8 +158,9 @@ func (s *state) saveLocked() error {
 func (s *state) productID(local int64) (string, bool) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	for id, l := range s.data.IDs {
+	for key, l := range s.data.IDs {
 		if l == local {
+			id, _, _ := strings.Cut(key, "@") // keys are "<product>@<version>" (versionKey)
 			return id, true
 		}
 	}