Added SAM icon due to missing asset (#318)

There was a report on Discord about the SAM icon not displaying
correctly.

https://discord.com/channels/1284581928254701718/1353348395506466937/1353348395506466937
After checking the CSS, I found that it was referencing a non-existent
path.
Since there was no dedicated image for the SAM, I created a custom one
to replace it.

Let me know if any adjustments are needed!
Thank you!
<img width="324" alt="スクリーンショット 2025-03-23 22 53 38"
src="https://github.com/user-attachments/assets/157f9b70-615c-4454-baaf-7f0c33e98ecf"
/>
<img width="759" alt="スクリーンショット 2025-03-23 22 42 33"
src="https://github.com/user-attachments/assets/35f3ea51-5804-4007-8e8d-40659f47276a"
/>

src/client/graphics/layers/BuildMenu.ts

@@ -17,6 +17,7 @@ import goldCoinIcon from "../../../../resources/images/GoldCoinIcon.svg";
 import portIcon from "../../../../resources/images/PortIcon.svg";
 import mirvIcon from "../../../../resources/images/MIRVIcon.svg";
 import cityIcon from "../../../../resources/images/CityIconWhite.svg";
+import samlauncherIcon from "../../../../resources/images/SamLauncherIconWhite.svg";
 import shieldIcon from "../../../../resources/images/ShieldIconWhite.svg";
 import { renderNumber } from "../../Utils";
 import { GameView, PlayerView } from "../../../core/game/GameView";
@@ -71,7 +72,7 @@ const buildTable: BuildItemDisplay[][] = [
     // needs new icon
     {
       unitType: UnitType.SAMLauncher,
-      icon: shieldIcon,
+      icon: samlauncherIcon,
       description: "Defends against incoming nukes",
       countable: true,
     },