v0.4.8

Persists calibration status in Home Assistant instead of browser storage.\n\nChanges:\n- Adds a per-pump Calibration status sensor.\n- Stores the last successful calibration timestamp in the integration config entry options.\n- Exposes last_calibrated, normal_setpoint, and feeding_setpoint as sensor attributes.\n- Updates the calibration panel to read calibrated/uncalibrated status from Home Assistant.\n- Marks a pump calibrated only after the wizard successfully restores normal speed at the end.\n- Bumps the panel asset version to avoid cached frontend code.