Replace donate buttons with attack ones for AFK friendly players in radial menu (#2987)

Resolves #2986

## Description:

Shows donate actions in radial menu only when friendly player is NOT
disconnected.
This is needed in order to let mobile/touch users attack AFK teammates.

Current behavior:
<img width="525" height="514" alt="image"
src="https://github.com/user-attachments/assets/78b95e27-443a-4dd5-934b-c8a841b4bf97"
/>

With this PR:
<img width="545" height="457" alt="image"
src="https://github.com/user-attachments/assets/e9792478-6ccd-415f-9199-cff7bfc9356f"
/>


## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

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

deshack_82603

src/client/graphics/layers/MainRadialMenu.ts

@@ -134,7 +134,9 @@ export class MainRadialMenu extends LitElement implements Layer {
     };
 
     const isFriendlyTarget =
-      recipient !== null && recipient.isFriendly(myPlayer);
+      recipient !== null &&
+      recipient.isFriendly(myPlayer) &&
+      !recipient.isDisconnected();
 
     this.radialMenu.setCenterButtonAppearance(
       isFriendlyTarget ? donateTroopIcon : swordIcon,