修复&优化听力补偿模块功能

client/src/pages/SelectPage.tsx

@@ -185,10 +185,23 @@ export function consumeSelectPageResult() {
 
 
 
+// Scroll position of the calling page, captured before navigating to /select.
+// The select page is short, so the browser clamps window scroll to 0 while on
+// it; without restoring, the calling page (e.g. Effects) reopens at the top.
+let selectReturnScroll: number | null = null;
+
+/** Consume the stored scroll position (once). Returns null when absent. */
+export function consumeSelectReturnScroll(): number | null {
+  const y = selectReturnScroll;
+  selectReturnScroll = null;
+  return y;
+}
+
 // Helper function to set select page state
 
 export function navigateToSelect(title: string, options: string[], selected: number, back: string, key: string) {
 
+  selectReturnScroll = window.scrollY;
   selectPageState = { title, options, selected, back, key };
 
 }