feat: footnote returns to original position on deep sleep to avoid losing reading position (#2394)

src/activities/reader/EpubReaderActivity.cpp

@@ -177,6 +177,14 @@ void EpubReaderActivity::onExit() {
 
   APP_STATE.readerActivityLoadCount = 0;
   APP_STATE.saveToFile();
+
+  // Leaving mid-footnote loses the in-RAM return stack on deep sleep; persist the
+  // pre-footnote position so the book reopens at the link origin, not the footnote.
+  if (footnoteDepth > 0 && epub) {
+    const SavedPosition& origin = savedPositions[0];
+    saveProgress(origin.spineIndex, origin.pageNumber, 0);
+  }
+
   section.reset();
   if (pendingReadFolderMove && epub) {
     const std::string srcPath = epub->getPath();