Feat: Sierpinski map - live play-tested (#2819)

## Description:

Map requested by creator on [dev
discord](https://discord.com/channels/1359946986937258015/1458638914012315741/1458638914012315741)
and playtested by 42 players on [Rex's
stream](https://www.youtube.com/watch?v=r9w9nr5Toso), adds map
Sierpinski, which is a sierpinski carpet shape. The map is a "party map"
great for private matches, but is not part of the public map rotation.

<img width="1400" height="1400" alt="image"
src="https://github.com/user-attachments/assets/8eead359-73d5-497f-8fee-40f413a22d0e"
/>



https://github.com/user-attachments/assets/3a726343-18e4-4f91-9f5c-1fff459d5a5f



## 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:

bijx

---------

Co-authored-by: iamlewis <lewismmmm@gmail.com>

src/core/game/Game.ts

@@ -109,6 +109,7 @@ export enum GameMapType {
   Lisbon = "Lisbon",
   Manicouagan = "Manicouagan",
   Lemnos = "Lemnos",
+  Sierpinski = "Sierpinski",
   TwoLakes = "Two Lakes",
   StraitOfHormuz = "Strait of Hormuz",
   Surrounded = "Surrounded",
@@ -172,8 +173,8 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.FourIslands,
     GameMapType.Svalmel,
     GameMapType.Surrounded,
-    GameMapType.Didier,
   ],
+  arcade: [GameMapType.Didier, GameMapType.Sierpinski],
 };
 
 export enum GameType {