feat(reader): End of Book next-book suggestions (#2499) (#2532)

src/activities/reader/EpubReaderActivity.h

@@ -6,6 +6,7 @@
 #include <optional>
 
 #include "BookmarkEntry.h"
+#include "EndOfBookOptions.h"
 #include "EpubReaderMenuActivity.h"
 #include "ProgressMapper.h"
 #include "activities/Activity.h"
@@ -45,6 +46,8 @@ class EpubReaderActivity final : public Activity {
   // Set when the reader is left at end-of-book and SETTINGS.moveFinishedToReadFolder is on.
   // Consumed in onExit() to relocate the finished book into /Read/.
   bool pendingReadFolderMove = false;
+  // Next-book suggestion menu for the End-of-Book screen
+  EndOfBookOptions endOfBookOptions;
 
   // Footnote support
   std::vector<FootnoteEntry> currentPageFootnotes;
@@ -88,6 +91,8 @@ class EpubReaderActivity final : public Activity {
   // Jump to a percentage of the book (0-100), mapping it to spine and page.
   void jumpToPercent(int percent);
   void onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction action);
+  // Opens the reader menu for the current position (short-press Confirm)
+  void openReaderMenu();
   // Returns true if sync acted (launched, or surfaced a save error); false if it was a no-op
   // because no KOReader credentials are stored.
   bool launchKOReaderSync();