Private Lobbies: Add kick player functionality (#1436)

## Description:
Added player management features so lobby hosts can kick players from
private games. This includes both UI changes and backend work.

### What's new:
- Hosts can now kick players from private lobbies with a simple button
- Added host badges and remove buttons to the UI
- Made sure only hosts can kick people, and hosts can't kick themselves

### How it works:
- When someone creates a private game, they automatically become the
host
- Kicking happens through WebSocket "kick-player" events
- Server checks that you're actually the host before letting you kick
anyone

<img width="1291" height="871" alt="Screenshot 2025-07-15 002114"
src="https://github.com/user-attachments/assets/ea575f83-a0f4-45d1-9cfe-7521d373f3d5"
/>



### Known Issues:
- Kicked player gets general message (same when kicked for multi tab)

### Other Issues:
- Host abandoment still existent (host clicks on x; or is closing tab)

## 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:

[UN]nvm

---------

Co-authored-by: floriankilian <floriankilian@users.noreply.github.com>

src/server/GameManager.ts

@@ -28,20 +28,31 @@ export class GameManager {
     return false;
   }
 
-  createGame(id: GameID, gameConfig: GameConfig | undefined) {
-    const game = new GameServer(id, this.log, Date.now(), this.config, {
-      gameMap: GameMapType.World,
-      gameType: GameType.Private,
-      difficulty: Difficulty.Medium,
-      disableNPCs: false,
-      infiniteGold: false,
-      infiniteTroops: false,
-      instantBuild: false,
-      gameMode: GameMode.FFA,
-      bots: 400,
-      disabledUnits: [],
-      ...gameConfig,
-    });
+  createGame(
+    id: GameID,
+    gameConfig: GameConfig | undefined,
+    creatorClientID?: string,
+  ) {
+    const game = new GameServer(
+      id,
+      this.log,
+      Date.now(),
+      this.config,
+      {
+        gameMap: GameMapType.World,
+        gameType: GameType.Private,
+        difficulty: Difficulty.Medium,
+        disableNPCs: false,
+        infiniteGold: false,
+        infiniteTroops: false,
+        instantBuild: false,
+        gameMode: GameMode.FFA,
+        bots: 400,
+        disabledUnits: [],
+        ...gameConfig,
+      },
+      creatorClientID,
+    );
     this.games.set(id, game);
     return game;
   }