improve streamer mode (#3353)

## Description:

improves streamer mode (doesn't show the gameID in the url, it just says
"streamer-mode"


## 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:

w.o.n

src/client/Main.ts

@@ -832,10 +832,13 @@ class Client {
         if (window.location.hash === "" || window.location.hash === "#") {
           history.replaceState(null, "", window.location.origin + "#refresh");
         }
+        const lobbyIdHidden = !this.userSettings.lobbyIdVisibility();
         history.pushState(
           null,
           "",
-          `/${config.workerPath(lobby.gameID)}/game/${lobby.gameID}?live`,
+          lobbyIdHidden
+            ? "/streamer-mode"
+            : `/${config.workerPath(lobby.gameID)}/game/${lobby.gameID}?live`,
         );
 
         // Store current URL for popstate confirmation
@@ -848,7 +851,10 @@ class Client {
     lobbyId: string,
     config: Awaited<ReturnType<typeof getServerConfigFromClient>>,
   ) {
-    const targetUrl = `/${config.workerPath(lobbyId)}/game/${lobbyId}`;
+    const lobbyIdHidden = !this.userSettings.lobbyIdVisibility();
+    const targetUrl = lobbyIdHidden
+      ? "/streamer-mode"
+      : `/${config.workerPath(lobbyId)}/game/${lobbyId}`;
     const currentUrl = window.location.pathname;
 
     if (currentUrl !== targetUrl) {