fix: corriger layout desktop — StatsPanel w-72 fixe, w-full dans drawer mobile

Remplace w-full lg:w-72 h-full (qui cassait les écrans 640-1023px) par
un prop className : w-72 shrink-0 par défaut (desktop), w-full flex-1
min-h-0 dans le drawer mobile.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/StatsPanel.tsx

@@ -7,6 +7,7 @@ interface StatsPanelProps {
   loading: boolean;
   periodDays: number;
   source: 'live' | 'mock';
+  className?: string;
   currentUD: number;
   animationLabel?: string;
   viewMode?: 'heatmap' | 'flow';
@@ -59,7 +60,7 @@ function CityRow({ city, volume, count, countryCode, accent }: {
   );
 }
 
-export function StatsPanel({ stats, loading, periodDays, source, currentUD, animationLabel, viewMode = 'heatmap', flowStats, focusCity, onClose }: StatsPanelProps) {
+export function StatsPanel({ stats, loading, periodDays, source, currentUD, animationLabel, viewMode = 'heatmap', flowStats, focusCity, onClose, className }: StatsPanelProps) {
   const periodLabel = periodDays === 1 ? '24 dernières heures' : `${periodDays} derniers jours`;
   const prevStats = useRef<PeriodStats | null>(null);
 
@@ -83,7 +84,7 @@ export function StatsPanel({ stats, loading, periodDays, source, currentUD, anim
   if (stats && !loading) prevStats.current = stats;
 
   return (
-    <aside className="w-full lg:w-72 shrink-0 flex flex-col gap-4 bg-[#0a0b0f]/95 backdrop-blur-sm border-r border-[#1e1f2a] p-5 overflow-y-auto h-full">
+    <aside className={`flex flex-col gap-4 bg-[#0a0b0f]/95 backdrop-blur-sm border-r border-[#1e1f2a] p-5 overflow-y-auto ${className ?? 'w-72 shrink-0'}`}>
       {/* Header */}
       <div className="flex items-center gap-2.5">
         <div className="w-8 h-8 rounded-full bg-[#d4a843] flex items-center justify-center text-[#0a0b0f] font-bold text-sm shadow-[0_0_16px_rgba(212,168,67,0.5)]">