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/execution/DeleteUnitExecution.ts

@@ -0,0 +1,81 @@
+import { Execution, Game, MessageType, Player } from "../game/Game";
+
+export class DeleteUnitExecution implements Execution {
+  private active: boolean = true;
+  private mg: Game;
+
+  constructor(
+    private player: Player,
+    private unitId: number,
+  ) {}
+
+  activeDuringSpawnPhase(): boolean {
+    return false;
+  }
+
+  init(mg: Game, ticks: number) {
+    if (!this.active) {
+      return;
+    }
+    this.mg = mg;
+
+    const unit = this.player.units().find((u) => u.id() === this.unitId);
+    if (!unit) {
+      console.warn(
+        `SECURITY: unit ${this.unitId} not found or not owned by player ${this.player.displayName()}`,
+      );
+      this.active = false;
+      return;
+    }
+
+    if (!unit.isActive()) {
+      console.warn(`SECURITY: unit ${this.unitId} is not active`);
+      this.active = false;
+      return;
+    }
+
+    const tileOwner = mg.owner(unit.tile());
+    if (!tileOwner.isPlayer() || tileOwner.id() !== this.player.id()) {
+      console.warn(
+        `SECURITY: unit ${this.unitId} is not on player's territory`,
+      );
+      this.active = false;
+      return;
+    }
+
+    if (!mg.isLand(unit.tile())) {
+      console.warn(`SECURITY: unit ${this.unitId} is not on land`);
+      this.active = false;
+      return;
+    }
+
+    if (mg.inSpawnPhase()) {
+      console.warn(`SECURITY: cannot delete units during spawn phase`);
+      this.active = false;
+      return;
+    }
+
+    if (!this.player.canDeleteUnit()) {
+      console.warn(`SECURITY: delete unit cooldown not expired`);
+      this.active = false;
+      return;
+    }
+
+    unit.delete(false);
+    this.player.recordDeleteUnit();
+
+    this.mg.displayMessage(
+      `events_display.unit_voluntarily_deleted`,
+      MessageType.UNIT_DESTROYED,
+      this.player.id(),
+    );
+
+    this.active = false;
+  }
+
+  tick(ticks: number) {}
+
+  isActive(): boolean {
+    return this.active;
+  }
+}

src/core/execution/ExecutionManager.ts

@@ -10,6 +10,7 @@ import { AttackExecution } from "./AttackExecution";
 import { BoatRetreatExecution } from "./BoatRetreatExecution";
 import { BotSpawner } from "./BotSpawner";
 import { ConstructionExecution } from "./ConstructionExecution";
+import { DeleteUnitExecution } from "./DeleteUnitExecution";
 import { DonateGoldExecution } from "./DonateGoldExecution";
 import { DonateTroopsExecution } from "./DonateTroopExecution";
 import { EmbargoExecution } from "./EmbargoExecution";
@@ -107,6 +108,8 @@ export class Executor {
 
       case "upgrade_structure":
         return new UpgradeStructureExecution(player, intent.unitId);
+      case "delete_unit":
+        return new DeleteUnitExecution(player, intent.unitId);
       case "quick_chat":
         return new QuickChatExecution(
           player,