feat: Add restart button functionality and motion calibration

- Implemented a restart button with debounce handling and long-press detection in App.cpp.
- Added motion calibration settings to Settings.cpp and Settings.h, allowing for roll and pitch zero offsets.
- Enhanced WebUI to include motion calibration controls and a restart option.
- Updated FaceRenderer to adjust eye and mouth positions based on screen dimensions.
- Introduced deadzone handling for motion sensor readings to improve stability.

src/net/WebUI.h

@@ -3,6 +3,7 @@
 #include "../settings/Settings.h"
 #include "../net/WiFiManager.h"
 #include "../sensors/MoistureSensor.h"
+#include "../sensors/MotionSensor.h"
 #include "../ui/FaceRenderer.h"
 #include "../net/WebhookService.h"
 
@@ -11,6 +12,7 @@ public:
   void begin(Settings& settings,
              WiFiManager& wifi,
              MoistureSensor& moisture,
+             MotionSensor& motion,
              FaceRenderer& face,
              WebhookService& webhook,
              unsigned long bootMs);
@@ -20,4 +22,4 @@ public:
 
 private:
   WebServer _server{80};
-};
+};