fix: align diary diet row and hide terminal cancel

- show only the personal diet name in the diary and keep the plan day chip
- hide consultation cancellation for terminal and non-cancellable states
- enable the refund form only for paid, started and in-progress plans
- cover diary rows and order info cancel visibility with tests

lib/features/plans/enums/chosen_plan_state_enum.dart

@@ -62,6 +62,32 @@ enum ChosenPlanStateEnum {
     }
   }
 
+  bool get canShowCancelAction {
+    switch (this) {
+      case ChosenPlanStateEnum.stateInited:
+      case ChosenPlanStateEnum.stateInCoordination:
+      case ChosenPlanStateEnum.stateStartDateHasBeenSet:
+      case ChosenPlanStateEnum.statePendingPayment:
+      case ChosenPlanStateEnum.statePaid:
+      case ChosenPlanStateEnum.stateStarted:
+      case ChosenPlanStateEnum.stateInProgress:
+        return true;
+      default:
+        return false;
+    }
+  }
+
+  bool get isCancelAfterPaidState {
+    switch (this) {
+      case ChosenPlanStateEnum.statePaid:
+      case ChosenPlanStateEnum.stateStarted:
+      case ChosenPlanStateEnum.stateInProgress:
+        return true;
+      default:
+        return false;
+    }
+  }
+
   static List<ChosenPlanStateEnum> getActiveStates() {
     return [
       ChosenPlanStateEnum.statePaid,