Updates

src/sensors/BatterySensor.h

@@ -10,6 +10,7 @@ public:
   int percent() const { return _percent; }
   float voltage() const { return _voltage; }
   bool isLow() const { return _isLow; }
+  bool isCharging() const { return _isCharging; }
   bool shouldBlink() const;
 
   // For display
@@ -18,6 +19,7 @@ public:
 private:
   static constexpr int PIN_BATTERY_ADC = 2;  // Voltage divider input
   static constexpr int PIN_LBO = 5;          // PowerBoost LBO pin
+  static constexpr int PIN_CHG = 4;          // PowerBoost CHG pin (LOW when charging)
 
   static constexpr unsigned long CHECK_INTERVAL_MS = 2000;
   static constexpr int SAMPLES = 10;  // Number of ADC samples to average
@@ -33,6 +35,7 @@ private:
   int _percent = 100;
   float _voltage = 3.7;
   bool _isLow = false;
+  bool _isCharging = false;
   unsigned long _lastCheckMs = 0;
 
   float readBatteryVoltage();