feat: wakeup target detection (#731)

## Summary

* If going to sleep was from the Reader view, wake up to the same book.
Otherwise, wakeup to the Home view

src/CrossPointState.h

@@ -10,6 +10,7 @@ class CrossPointState {
   std::string openEpubPath;
   uint8_t lastSleepImage;
   uint8_t readerActivityLoadCount = 0;
+  bool lastSleepFromReader = false;
   ~CrossPointState() = default;
 
   // Get singleton instance