feat: preserve BI sub tab history

src/modules/energy/ElectricModule.tsx

@@ -24,10 +24,16 @@ export default function ElectricModule() {
       meta="时间单位清晰标注 · 支持日/总览切换"
       actions={<BiHeaderActions domain="electric" />}
     >
-      <SubTabs tabs={SUB_TABS} active={sub} onChange={setSub} />
+      <SubTabs tabs={SUB_TABS} active={sub} onChange={setSub} idPrefix="electric-view" ariaLabel="电能分析视图" />
       <AnimatePresence mode="wait">
         <FadeIn key={sub}>
-          <ElectricView sub={sub} />
+          <div
+            id={`electric-view-panel-${sub}`}
+            role="tabpanel"
+            aria-labelledby={`electric-view-tab-${sub}`}
+          >
+            <ElectricView sub={sub} />
+          </div>
         </FadeIn>
       </AnimatePresence>
     </PageFrame>