feat: implement sensor calibration flow

lib/data/sources/localiser/sensor_client.dart

@@ -38,17 +38,22 @@ class SensorClient extends LocaliserdClient {
           })
           as Map<String, dynamic>;
 
-  Future<Map<String, dynamic>> startCalibration(
-    int id,
-    double referenceDistance,
-  ) async =>
-      await post('/api/sensors/$id/calibration/start', {
-            'reference_distance': referenceDistance,
+  Future<Map<String, dynamic>> beginCalibration(int id) async =>
+      await post('/api/sensors/$id/calibration/begin') as Map<String, dynamic>;
+
+  Future<Map<String, dynamic>> startStage(int id, double distance) async =>
+      await post('/api/sensors/$id/calibration/stage', {
+            'distance': distance,
           })
           as Map<String, dynamic>;
 
-  Future<Map<String, dynamic>> stopCalibration(int id) async =>
-      await post('/api/sensors/$id/calibration/stop') as Map<String, dynamic>;
+  Future<Map<String, dynamic>> finishCalibration(int id) async =>
+      await post(
+        '/api/sensors/$id/calibration/finish',
+      ) as Map<String, dynamic>;
+
+  Future<void> cancelCalibration(int id) =>
+      delete('/api/sensors/$id/calibration');
 
   Future<String> getVersion(int id) async {
     final response =