fix: overflow-x-hidden 改为 overflow-x:clip 修复 sticky 吸顶

overflow-x:hidden 会创建滚动容器导致 position:sticky 失效，
改用 overflow-x:clip 裁剪溢出但不破坏 sticky 定位。

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/mileage/MileageModule.tsx

@@ -9,7 +9,7 @@ export default function MileageModule() {
   const [activeSubTab, setActiveSubTab] = useState<'monitoring' | 'statistics' | 'report'>('monitoring');
 
   return (
-    <div className="min-h-screen bg-[#F8F9FB] text-gray-800 font-sans p-3 md:p-6 relative overflow-x-hidden">
+    <div className="min-h-screen bg-[#F8F9FB] text-gray-800 font-sans p-3 md:p-6 relative" style={{ overflowX: 'clip' }}>
       <div className="max-w-6xl mx-auto flex flex-col gap-3 pb-16 landscape:pb-0 landscape:h-full landscape:flex-1 landscape:overflow-hidden">
         {/* Sub-navigation — sticky */}
         <div className="bg-white px-4 py-2 rounded-2xl border border-slate-100 shadow-sm flex items-center gap-6 sticky top-0 z-30">

src/modules/mileage/StatisticsView.tsx

@@ -62,7 +62,7 @@ export default function StatisticsView() {
   }, [selectedTargetId]);
 
   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 overflow-x-hidden">
+    <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' }}>
       {/* Project Selector - Full width even in landscape */}
       <div className="bg-white landscape:bg-slate-900/50 landscape:border-slate-800 p-2 rounded-2xl shadow-sm border border-slate-100 flex gap-1 overflow-x-auto no-scrollbar flex-shrink-0">
         {targets.map(target => (