polish(midsummer): guard frog-hop against rapid re-click stacking

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

frontend/src/components/map/Sidebar.tsx

@@ -62,6 +62,9 @@ export const Sidebar: React.FC<Props> = ({
         <span className="ml-sidebar-title" style={{ cursor: 'pointer' }} onClick={() => {
           // 🐸 Små grodorna hop — bounce the whole layout and send frogs
           // leaping up the screen. Replaces the old rickroll.
+          // Ignore rapid re-clicks while a hop is already in flight so the
+          // frog layers and their cleanup timers don't stack.
+          if (document.querySelector('.ms-hop-frogs')) return;
           const layout = document.querySelector('.ml-layout') as HTMLElement | null;
           if (layout) {
             layout.classList.remove('ms-hop');