Add customize-screen shop preview and purchase flow.

Locked items can be previewed on the pet from the editor, purchased with points in the preview modal, and opened in the full customize view from the shop.

components/pet/room-style-selector.tsx

@@ -14,12 +14,14 @@ type RoomStyleSelectorProps = {
   activeId: RoomBackgroundId;
   ownedItemIds: readonly string[];
   onSelect: (roomId: RoomBackgroundId) => void;
+  onLockedSelect?: (roomId: RoomBackgroundId) => void;
 };
 
 export function RoomStyleSelector({
   activeId,
   ownedItemIds,
   onSelect,
+  onLockedSelect,
 }: RoomStyleSelectorProps) {
   const slots = Array.from({ length: PIECE_SLOT_COUNT }, (_, index) =>
     ROOM_BACKGROUNDS[index] ?? null,
@@ -44,20 +46,25 @@ export function RoomStyleSelector({
           <button
             key={room.id}
             type="button"
-            disabled={locked}
-            aria-disabled={locked}
             title={
-              locked ? `${room.name} — unlock in the shop` : room.name
+              locked ? `${room.name} — preview in shop` : room.name
             }
             aria-label={
-              locked ? `${room.name}, locked — unlock in the shop` : room.name
+              locked ? `${room.name}, locked — preview to unlock` : room.name
             }
             aria-pressed={activeId === room.id}
-            onClick={() => onSelect(room.id)}
+            onClick={() => {
+              if (locked) {
+                onLockedSelect?.(room.id);
+                return;
+              }
+
+              onSelect(room.id);
+            }}
             className={cn(
               "relative size-14 overflow-hidden rounded-lg border transition-colors",
               locked
-                ? "cursor-not-allowed border-border/40 opacity-80"
+                ? "border-border/40 opacity-80 hover:border-border"
                 : activeId === room.id
                   ? "border-foreground shadow-[inset_0_0_0_1px_hsl(var(--foreground)/0.15)]"
                   : "border-border/60 hover:border-border",