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/client/Main.ts

@@ -1,6 +1,7 @@
 import favicon from "../../resources/images/Favicon.svg";
 import version from "../../resources/version.txt";
 import { UserMeResponse } from "../core/ApiSchemas";
+import { EventBus } from "../core/EventBus";
 import { GameRecord, GameStartInfo, ID } from "../core/Schemas";
 import { ServerConfig } from "../core/configuration/Config";
 import { getServerConfigFromClient } from "../core/configuration/ConfigLoader";
@@ -24,6 +25,7 @@ import "./PublicLobby";
 import { PublicLobby } from "./PublicLobby";
 import { SinglePlayerModal } from "./SinglePlayerModal";
 import { TerritoryPatternsModal } from "./TerritoryPatternsModal";
+import { SendKickPlayerIntentEvent } from "./Transport";
 import { UserSettingModal } from "./UserSettingModal";
 import "./UsernameInput";
 import { UsernameInput } from "./UsernameInput";
@@ -77,6 +79,7 @@ export interface JoinLobbyEvent {
 
 class Client {
   private gameStop: (() => void) | null = null;
+  private eventBus: EventBus = new EventBus();
 
   private usernameInput: UsernameInput | null = null;
   private flagInput: FlagInput | null = null;
@@ -163,6 +166,7 @@ class Client {
     setFavicon();
     document.addEventListener("join-lobby", this.handleJoinLobby.bind(this));
     document.addEventListener("leave-lobby", this.handleLeaveLobby.bind(this));
+    document.addEventListener("kick-player", this.handleKickPlayer.bind(this));
 
     const spModal = document.querySelector(
       "single-player-modal",
@@ -429,6 +433,7 @@ class Client {
     const config = await getServerConfigFromClient();
 
     this.gameStop = joinLobby(
+      this.eventBus,
       {
         gameID: lobby.gameID,
         serverConfig: config,
@@ -514,6 +519,15 @@ class Client {
     this.gameStop = null;
     this.publicLobby.leaveLobby();
   }
+
+  private handleKickPlayer(event: CustomEvent) {
+    const { target } = event.detail;
+
+    // Forward to eventBus if available
+    if (this.eventBus) {
+      this.eventBus.emit(new SendKickPlayerIntentEvent(target));
+    }
+  }
 }
 
 // Initialize the client when the DOM is loaded