SAM not working against MIRV warhead (#818)

## Description:

The nukes are setting a `detonationDst` that is never used in UnitImpl.

Without the target tile, SAM launchers ignore the MIRV warheads.

Illustration with 50 SAM vs 2 warhead:

![image](https://github.com/user-attachments/assets/cac20dc6-9a28-4801-a834-364fa36b612d)



The nuke icon is also staying white while being nuked:

![image](https://github.com/user-attachments/assets/badf6630-9a5e-4491-b1b7-1008d32f5efc)


## 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:

IngloriousTom

src/core/execution/NukeExecution.ts

@@ -119,7 +119,7 @@ export class NukeExecution implements Execution {
         this.type !== UnitType.MIRVWarhead,
       );
       this.nuke = this.player.buildUnit(this.type, spawn, {
-        detonationDst: this.dst,
+        targetTile: this.dst,
       });
       if (this.mg.hasOwner(this.dst)) {
         const target = this.mg.owner(this.dst);

src/core/game/Game.ts

@@ -164,9 +164,13 @@ export interface UnitParamsMap {
 
   [UnitType.Port]: {};
 
-  [UnitType.AtomBomb]: {};
+  [UnitType.AtomBomb]: {
+    targetTile?: number;
+  };
 
-  [UnitType.HydrogenBomb]: {};
+  [UnitType.HydrogenBomb]: {
+    targetTile?: number;
+  };
 
   [UnitType.TradeShip]: {
     dstPort: Unit;
@@ -185,7 +189,9 @@ export interface UnitParamsMap {
 
   [UnitType.MIRV]: {};
 
-  [UnitType.MIRVWarhead]: {};
+  [UnitType.MIRVWarhead]: {
+    targetTile?: number;
+  };
 
   [UnitType.Construction]: {};
 }

src/core/game/UnitImpl.ts

@@ -39,7 +39,8 @@ export class UnitImpl implements Unit {
   ) {
     this._lastTile = _tile;
     this._health = toInt(this.mg.unitInfo(_type).maxHealth ?? 1);
-
+    this._targetTile =
+      "targetTile" in params ? (params.targetTile ?? undefined) : undefined;
     this._troops = "troops" in params ? (params.troops ?? 0) : 0;
     this._lastSetSafeFromPirates =
       "lastSetSafeFromPirates" in params

tests/SAM.test.ts

@@ -63,10 +63,10 @@ describe("SAM", () => {
     const sam = defender.buildUnit(UnitType.SAMLauncher, game.ref(1, 1), {});
     game.addExecution(new SAMLauncherExecution(defender.id(), null, sam));
     attacker.buildUnit(UnitType.AtomBomb, game.ref(2, 1), {
-      detonationDst: game.ref(2, 1),
+      targetTile: game.ref(2, 1),
     });
     attacker.buildUnit(UnitType.AtomBomb, game.ref(1, 2), {
-      detonationDst: game.ref(1, 2),
+      targetTile: game.ref(1, 2),
     });
     expect(attacker.units(UnitType.AtomBomb)).toHaveLength(2);
 
@@ -80,7 +80,7 @@ describe("SAM", () => {
     game.addExecution(new SAMLauncherExecution(defender.id(), null, sam));
     expect(sam.isInCooldown()).toBeFalsy();
     const nuke = attacker.buildUnit(UnitType.AtomBomb, game.ref(1, 2), {
-      detonationDst: game.ref(1, 2),
+      targetTile: game.ref(1, 2),
     });
 
     executeTicks(game, 3);
@@ -104,7 +104,7 @@ describe("SAM", () => {
     const sam2 = defender.buildUnit(UnitType.SAMLauncher, game.ref(1, 2), {});
     game.addExecution(new SAMLauncherExecution(defender.id(), null, sam2));
     const nuke = attacker.buildUnit(UnitType.AtomBomb, game.ref(2, 2), {
-      detonationDst: game.ref(2, 2),
+      targetTile: game.ref(2, 2),
     });
 
     executeTicks(game, 3);