Kitchen panel no longer leaks over station scenes

It was born visible — a day starting at a station (prep/juice/grate)
never passes through kitchen.enter()/exit(), so the BROWNING panel sat
over every station HUD. Hidden at construction like every other scene;
verified hidden at bench, shown after handoff, hidden at juice.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/scenes/kitchen.ts

@@ -134,6 +134,9 @@ export class KitchenView implements View {
 
     this.panel = new Panel('toast-panel');
     this.buildUi();
+    // Hidden until enter() — a day that starts at a station (prep/juice/grate)
+    // never passes through the kitchen, and a born-visible panel leaks over it.
+    this.panel.hide();
     this.loadBread('white');
   }