Add cover art picker setting and update file handling accordingly

- Added new `useCoverArtPicker` setting to CrossPointSettings.
- Updated saveToFile and loadFromFile methods to handle the new setting.
- Modified ReaderActivity to use CoverArtPickerActivity if enabled.
- Adjusted settings count in SettingsActivity.

src/CrossPointSettings.cpp

@@ -12,7 +12,7 @@ CrossPointSettings CrossPointSettings::instance;
 namespace {
 constexpr uint8_t SETTINGS_FILE_VERSION = 1;
 // Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 11;
+constexpr uint8_t SETTINGS_COUNT = 12;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -38,6 +38,7 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, fontSize);
   serialization::writePod(outputFile, lineSpacing);
   serialization::writePod(outputFile, bluetoothEnabled);
+  serialization::writePod(outputFile, useCoverArtPicker);
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -86,6 +87,8 @@ bool CrossPointSettings::loadFromFile() {
     if (++settingsRead >= fileSettingsCount) break;
     serialization::readPod(inputFile, bluetoothEnabled);
     if (++settingsRead >= fileSettingsCount) break;
+    serialization::readPod(inputFile, useCoverArtPicker);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();