Attempt to fix roll correction

source/imu.h

@@ -4,11 +4,6 @@
 
 extern LSM6DS3 imu;
 
-// Roll-compensation rotation matrix coefficients (computed in calibrateGyroBias).
-// Rotate device-frame [gz, gy] → world-frame [screenX, screenY].
-extern float rollSin;  // sin of device yaw on table
-extern float rollCos;  // cos of device yaw on table
-
 void imuWriteReg(uint8_t reg, uint8_t val);
 uint8_t imuReadReg(uint8_t reg);
 float readIMUTemp();