Add button for remove building (#1609)

## Description:

Added a red delete button with trash can icon to the right-click radial
menu that allows players to voluntarily delete their own units.

## 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
- [x] I have read and accepted the CLA agreement (only required once).

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

Kipstz

<img width="286" height="209" alt="image"
src="https://github.com/user-attachments/assets/85142be3-2aa5-4c84-ab30-0c68289c8f85"
/>

---------

Co-authored-by: Drills Kibo <59177241+drillskibo@users.noreply.github.com>

src/core/game/PlayerImpl.ts

@@ -95,6 +95,8 @@ export class PlayerImpl implements Player {
 
   private relations = new Map<Player, number>();
 
+  private lastDeleteUnitTick: Tick = -1;
+
   public _incomingAttacks: Attack[] = [];
   public _outgoingAttacks: Attack[] = [];
   public _outgoingLandAttacks: Attack[] = [];
@@ -632,6 +634,17 @@ export class PlayerImpl implements Player {
     return true;
   }
 
+  canDeleteUnit(): boolean {
+    return (
+      this.mg.ticks() - this.lastDeleteUnitTick >=
+      this.mg.config().deleteUnitCooldown()
+    );
+  }
+
+  recordDeleteUnit(): void {
+    this.lastDeleteUnitTick = this.mg.ticks();
+  }
+
   hasEmbargoAgainst(other: Player): boolean {
     return this.embargoes.has(other.id());
   }