feat: adaptation mobile — drawer bottom + layout responsive

Sur smartphone (< 640px) : panneau stats masqué par défaut, accessible
via un bottom drawer animé (bouton ☰). PeriodSelector passe en flex-wrap
avec padding tactile 44px. AnimationPlayer s'adapte à la largeur écran.
Badge ville focus affiché directement sur la carte en mode mobile.

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

src/components/StatsPanel.tsx

@@ -12,6 +12,7 @@ interface StatsPanelProps {
   viewMode?: 'heatmap' | 'flow';
   flowStats?: FlowStats | null;
   focusCity?: string | null;
+  onClose?: () => void;
 }
 
 const MEDALS = ['🥇', '🥈', '🥉'];
@@ -58,7 +59,7 @@ function CityRow({ city, volume, count, countryCode, accent }: {
   );
 }
 
-export function StatsPanel({ stats, loading, periodDays, source, currentUD, animationLabel, viewMode = 'heatmap', flowStats, focusCity }: StatsPanelProps) {
+export function StatsPanel({ stats, loading, periodDays, source, currentUD, animationLabel, viewMode = 'heatmap', flowStats, focusCity, onClose }: StatsPanelProps) {
   const periodLabel = periodDays === 1 ? '24 dernières heures' : `${periodDays} derniers jours`;
   const prevStats = useRef<PeriodStats | null>(null);
 
@@ -82,7 +83,7 @@ export function StatsPanel({ stats, loading, periodDays, source, currentUD, anim
   if (stats && !loading) prevStats.current = stats;
 
   return (
-    <aside className="w-72 shrink-0 flex flex-col gap-4 bg-[#0a0b0f]/95 backdrop-blur-sm border-r border-[#1e1f2a] p-5 overflow-y-auto">
+    <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">
       {/* 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)]">
@@ -95,6 +96,15 @@ export function StatsPanel({ stats, loading, periodDays, source, currentUD, anim
           </h1>
           <p className="text-[#4b5563] text-xs">Monnaie libre · Flux géo</p>
         </div>
+        {onClose && (
+          <button
+            onClick={onClose}
+            className="ml-auto text-[#4b5563] hover:text-white transition-colors p-1 text-lg leading-none"
+            aria-label="Fermer"
+          >
+            ✕
+          </button>
+        )}
       </div>
 
       {/* Description */}