Discard items left in their pickup box past a 15-minute window

An item's pickup window starts when it goes into its box. Once it runs
out, the item is discarded without a refund and the box is freed; a box
that's open at that moment is left alone. With no scheduler yet, reads,
box actions and the kitchen simulation check for expired items first.

The order card shows a live countdown under "Ready for pickup" and a
"Not picked up in time" banner once discarded. Also bounces the lock
icon and animates the pickup button's label changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/orders/OrderStatusView.module.scss

@@ -373,6 +373,7 @@
   .pickupButton {
     overflow: hidden;
     white-space: nowrap;
+    transition: opacity 0.3s ease;
     border-color: $color-text;
     background: $color-text;
     color: $color-background;