Add notifications for troops attacking wilderness (#363)

+Retreat cost no soldiers when coming back from wilderness
+ Also work with contamined area


![image](https://github.com/user-attachments/assets/6dda168c-aade-4ba5-ac2a-6de028fbaf6d)

![image](https://github.com/user-attachments/assets/89966516-e86d-4d06-8b32-3bf36179eea1)


## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

quentin.qsi

src/core/execution/AttackExecution.ts

@@ -190,7 +190,11 @@ export class AttackExecution implements Execution {
 
   tick(ticks: number) {
     if (this.attack.retreated()) {
-      this.retreat(malusForRetreat);
+      if (this.attack.target().isPlayer()) {
+        this.retreat(malusForRetreat);
+      } else {
+        this.retreat();
+      }
       this.active = false;
       return;
     }