fix: preserve electric drilldown history

src/modules/energy/ElectricDaily.tsx

@@ -58,9 +58,9 @@ export default function ElectricDaily() {
   const selectedDateRef = useRef(selectedDate);
   selectedDateRef.current = selectedDate;
 
-  const commitDrillContext = useCallback((next: ElectricDrillContext) => {
+  const commitDrillContext = useCallback((next: ElectricDrillContext, mode: 'push' | 'replace' = 'replace') => {
     const url = buildElectricDrillUrl(window.location, next);
-    window.history.replaceState(null, '', url);
+    window.history[mode === 'push' ? 'pushState' : 'replaceState'](null, '', url);
     setDrillContext(next);
   }, []);
 
@@ -148,13 +148,14 @@ export default function ElectricDaily() {
   };
 
   const toggleDate = (date: string) => {
+    const opening = selectedDate !== date;
     commitDrillContext({
       ...drillContext,
       vehicleScope,
       startDate: effectiveRange.start,
       endDate: effectiveRange.end,
-      selectedDate: selectedDate === date ? undefined : date,
-    });
+      selectedDate: opening ? date : undefined,
+    }, opening ? 'push' : 'replace');
   };
 
   useEffect(() => {
@@ -251,10 +252,13 @@ export default function ElectricDaily() {
           return (
             <div key={m.month} className="border-t border-slate-100 first:border-t-0">
               <button
+                type="button"
                 onClick={() => toggleMonth(m.month)}
                 className={`w-full grid grid-cols-[minmax(0,1fr)_120px_88px] md:grid-cols-[minmax(0,1fr)_160px_120px] gap-3 px-3 py-2.5 text-left transition-colors ${
                   open ? 'bg-blue-50/30' : 'hover:bg-slate-50'
                 }`}
+                aria-expanded={open}
+                aria-controls={open ? `electric-month-${m.month}` : undefined}
               >
                 <span className="flex items-center gap-1 text-[12px] text-slate-700 font-bold">
                   <ChevronRight size={14} className={`transition-transform ${open ? 'rotate-90' : ''} text-slate-400`} />
@@ -268,6 +272,7 @@ export default function ElectricDaily() {
               <AnimatePresence initial={false}>
                 {open && (
                   <motion.div
+                    id={`electric-month-${m.month}`}
                     initial={{ height: 0, opacity: 0 }}
                     animate={{ height: 'auto', opacity: 1 }}
                     exit={{ height: 0, opacity: 0 }}
@@ -286,6 +291,7 @@ export default function ElectricDaily() {
                             onClick={() => toggleDate(d.date)}
                             className={`grid w-full grid-cols-[minmax(0,1fr)_120px_88px] gap-3 px-3 py-2 pl-9 text-left md:grid-cols-[minmax(0,1fr)_160px_120px] ${abnormalBg}`}
                             aria-expanded={selectedDate === d.date}
+                            aria-controls={selectedDate === d.date ? `electric-orders-${d.date}` : undefined}
                           >
                             <span className="flex items-center gap-1 text-[12px] font-bold text-slate-600">
                               <ChevronRight size={12} className={`text-slate-400 transition-transform ${selectedDate === d.date ? 'rotate-90' : ''}`} />
@@ -297,7 +303,7 @@ export default function ElectricDaily() {
                             <span className="text-right"><TrendBadge value={d.chainPct} /></span>
                           </button>
                           {selectedDate === d.date && (
-                            <div className="border-t border-blue-100 bg-blue-50/40 px-3 py-3 md:pl-9">
+                            <div id={`electric-orders-${d.date}`} className="border-t border-blue-100 bg-blue-50/40 px-3 py-3 md:pl-9">
                               {ordersError ? (
                                 <ErrorState message={ordersError} variant="inline" />
                               ) : !orders || orders.date !== d.date ? (