Add Bluetooth HID remote control support

Integrate BLE keyboard host functionality for page-turner remotes. Adds device pairing, button mapping, preset configurations for Free2/Free3 remotes, and persistent storage of mappings. Migrates from open-x4-sdk to freeink-sdk submodule which includes the BleKeyboardHost library. Implements CPU frequency locking during BLE operations to prevent watchdog timeouts.

src/activities/reader/EpubReaderMenuActivity.cpp

@@ -3,6 +3,8 @@
 #include <GfxRenderer.h>
 #include <I18n.h>
 
+#include "BleInput.h"
+#include "CrossPointSettings.h"
 #include "MappedInputManager.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
@@ -22,7 +24,7 @@ EpubReaderMenuActivity::EpubReaderMenuActivity(GfxRenderer& renderer, MappedInpu
 std::vector<EpubReaderMenuActivity::MenuItem> EpubReaderMenuActivity::buildMenuItems(bool hasFootnotes,
                                                                                      bool hasBookmarks) {
   std::vector<MenuItem> items;
-  items.reserve(12);
+  items.reserve(13);
   items.push_back({MenuAction::SELECT_CHAPTER, StrId::STR_SELECT_CHAPTER});
   if (hasFootnotes) {
     items.push_back({MenuAction::FOOTNOTES, StrId::STR_FOOTNOTES});
@@ -36,6 +38,7 @@ std::vector<EpubReaderMenuActivity::MenuItem> EpubReaderMenuActivity::buildMenuI
   items.push_back({MenuAction::GO_TO_PERCENT, StrId::STR_GO_TO_PERCENT});
   items.push_back({MenuAction::SCREENSHOT, StrId::STR_SCREENSHOT_BUTTON});
   items.push_back({MenuAction::DISPLAY_QR, StrId::STR_DISPLAY_QR});
+  items.push_back({MenuAction::TOGGLE_BLUETOOTH, StrId::STR_TOGGLE_BLUETOOTH});
   items.push_back({MenuAction::GO_HOME, StrId::STR_GO_HOME_BUTTON});
   items.push_back({MenuAction::SYNC, StrId::STR_SYNC_PROGRESS});
   items.push_back({MenuAction::DELETE_CACHE, StrId::STR_DELETE_CACHE});
@@ -76,6 +79,19 @@ void EpubReaderMenuActivity::loop() {
       return;
     }
 
+    if (selectedAction == MenuAction::TOGGLE_BLUETOOTH) {
+      // Toggle in place and stay in the menu (no reader re-render needed).
+      SETTINGS.bluetoothEnabled = SETTINGS.bluetoothEnabled ? 0 : 1;
+      if (SETTINGS.bluetoothEnabled) {
+        bleinput::ensureStarted();
+      } else {
+        bleinput::stop();
+      }
+      SETTINGS.saveToFile();
+      requestUpdate();
+      return;
+    }
+
     setResult(MenuResult{static_cast<int>(selectedAction), pendingOrientation, selectedPageTurnOption});
     finish();
     return;
@@ -125,6 +141,9 @@ void EpubReaderMenuActivity::render(RenderLock&&) {
         } else if (value == MenuAction::AUTO_PAGE_TURN) {
           // Render current page turn value on the right edge of the content area.
           return pageTurnLabels[selectedPageTurnOption];
+        } else if (value == MenuAction::TOGGLE_BLUETOOTH) {
+          // Render current Bluetooth on/off state on the right edge.
+          return SETTINGS.bluetoothEnabled ? tr(STR_STATE_ON) : tr(STR_STATE_OFF);
         } else {
           return "";
         }