feat(midsummer): rain of flowers/frogs/Swedish flags, dots become frogs, drop jingle

Per request: remove the WebAudio jingle (+ its 🔊 toggle and sound state);
replace the one-shot confetti with a continuous rain of 🌼🌸🐸🇸🇪🌿 over the
screen (MidsummerRain, gated by the theme, reduced-motion aware, leak-free);
and replace player-dot markers with frogs themselves (override the inline
dot color/border) instead of a flower-crown on top. Still toggled by the
🐸 Midsommar switch. Includes rebuilt static bundle.

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

frontend/src/components/map/MapLayout.tsx

@@ -7,8 +7,8 @@ import { WindowRenderer } from '../windows/WindowRenderer';
 import { RareNotification } from '../effects/RareNotification';
 import { DeathNotification } from '../effects/DeathNotification';
 import { usePlayerColors } from '../../hooks/usePlayerColors';
-import { useMidsummerSound } from '../../hooks/useMidsummerSound';
 import { MidsummerBanner } from '../midsummer/MidsummerBanner';
+import { MidsummerRain } from '../midsummer/MidsummerRain';
 import type { DashboardState } from '../../hooks/useLiveData';
 
 interface Props {
@@ -17,7 +17,6 @@ interface Props {
 
 export const MapLayout: React.FC<Props> = ({ data }) => {
   const getColor = usePlayerColors();
-  useMidsummerSound();
   const [showHeatmap, setShowHeatmap] = useState(false);
   const [showPortals, setShowPortals] = useState(false);
   const [selectedPlayer, setSelectedPlayer] = useState<string | null>(null);
@@ -45,6 +44,7 @@ export const MapLayout: React.FC<Props> = ({ data }) => {
     <WindowManagerProvider>
       <div className="ml-layout">
         <MidsummerBanner />
+        <MidsummerRain />
         <Sidebar
           players={players}
           vitals={vitalsMap}