Improve error handling, ensure robust defaults, and eliminate unsafe unwraps/expectations across modules.

Software/MainBoard/rust/src/tank.rs

@@ -158,12 +158,11 @@ pub async fn determine_tank_state(
     board: &mut MutexGuard<'static, CriticalSectionRawMutex, HAL<'static>>,
 ) -> TankState {
     if board.board_hal.get_config().tank.tank_sensor_enabled {
-        match board
-            .board_hal
-            .get_tank_sensor()
-            .map(|f| f.tank_sensor_voltage())
-        {
-            Ok(raw_sensor_value_mv) => TankState::Present(raw_sensor_value_mv.await.unwrap()),
+        match board.board_hal.get_tank_sensor() {
+            Ok(sensor) => match sensor.tank_sensor_voltage().await {
+                Ok(raw_sensor_value_mv) => TankState::Present(raw_sensor_value_mv),
+                Err(err) => TankState::Error(TankError::BoardError(err.to_string())),
+            },
             Err(err) => TankState::Error(TankError::BoardError(err.to_string())),
         }
     } else {