feat: Auto Page Turn for Epub Reader (#1219)

## Summary

* **What is the goal of this PR?** (e.g., Implements the new feature for
file uploading.)
- Implements auto page turn feature for epub reader in the reader
submenu

* **What changes are included?**
  - added auto page turn feature in epub reader in the submenu
  - currently there are 5 settings, `OFF, 1, 3, 6, 12` pages per minute

## Additional Context
* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
  specific areas to focus on).
  - Replacement PR for #723 
- when auto turn is enabled, space reserved for chapter title will be
used to indicate auto page turn being active
  - Back and Confirm button is used to disable it

---

### AI Usage

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Did you use AI tools to help write this code? _**Partially (mainly code
reviews)**_

src/activities/reader/EpubReaderActivity.h

@@ -14,6 +14,8 @@ class EpubReaderActivity final : public Activity {
   int pagesUntilFullRefresh = 0;
   int cachedSpineIndex = 0;
   int cachedChapterTotalPageCount = 0;
+  unsigned long lastPageTurnTime = 0UL;
+  unsigned long pageTurnDuration = 0UL;
   // Signals that the next render should reposition within the newly loaded section
   // based on a cross-book percentage jump.
   bool pendingPercentJump = false;
@@ -21,6 +23,7 @@ class EpubReaderActivity final : public Activity {
   float pendingSpineProgress = 0.0f;
   bool pendingScreenshot = false;
   bool skipNextButtonCheck = false;  // Skip button processing for one frame after subactivity exit
+  bool automaticPageTurnActive = false;
 
   // Footnote support
   std::vector<FootnoteEntry> currentPageFootnotes;
@@ -40,6 +43,8 @@ class EpubReaderActivity final : public Activity {
   void jumpToPercent(int percent);
   void onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction action);
   void applyOrientation(uint8_t orientation);
+  void toggleAutoPageTurn(uint8_t selectedPageTurnOption);
+  void pageTurn(bool isForwardTurn);
 
   // Footnote navigation
   void navigateToHref(const std::string& href, bool savePosition = false);