fix(mileage): 减少车型展开时页面抖动

src/modules/mileage/StatisticsView.tsx

@@ -115,7 +115,7 @@ export default function StatisticsView() {
   }, [viewAllTargetId, viewAllDate]);
 
   return (
-    <div className="space-y-2 pb-2 landscape:pb-4 landscape:h-full landscape:overflow-hidden landscape:flex landscape:flex-col flex-none landscape:flex-1" style={{ overflowX: 'clip' }}>
+    <div className="space-y-2 pb-2 landscape:pb-4 landscape:h-full landscape:overflow-hidden landscape:flex landscape:flex-col flex-none landscape:flex-1 [overflow-anchor:none]" style={{ overflowX: 'clip' }}>
       {/* Project Selector */}
       <div className="bg-white p-2 rounded-2xl shadow-sm border border-slate-100 flex gap-1 overflow-x-auto no-scrollbar flex-shrink-0">
         {targets.map(target => (
@@ -317,12 +317,13 @@ export default function StatisticsView() {
                   </div>
                 </div>
 
-                <AnimatePresence>
+                <AnimatePresence initial={false} mode="wait">
                   {expandedTargetId === target.id && (
                     <motion.div
                       initial={{ height: 0, opacity: 0 }}
                       animate={{ height: 'auto', opacity: 1 }}
                       exit={{ height: 0, opacity: 0 }}
+                      transition={{ duration: 0.18, ease: 'easeOut' }}
                       className="overflow-hidden"
                     >
                       <div className="pt-3 mt-2 border-t border-slate-50 grid grid-cols-2 gap-x-4 gap-y-3">