Disable game buttons (clan tag + username) (#4170)

## Description:

disables buttons, instead of emitting a warning 
<img width="1017" height="677" alt="image"
src="https://github.com/user-attachments/assets/7af4e0e1-df22-4cfe-bc8b-6fae5e62f9b6"
/>


<img width="1006" height="668" alt="image"
src="https://github.com/user-attachments/assets/d8e5291c-4ecd-4f8d-8471-e5a547c30eda"
/>


## 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

## Please put your Discord username so you can be contacted if a bug or
regression is found:

w.o.n

src/client/Main.ts

@@ -814,7 +814,7 @@ class Client {
   private async handleJoinLobby(event: CustomEvent<JoinLobbyEvent>) {
     const lobby = event.detail;
     this.mostRecentJoinEvent = event.timeStamp;
-    if (this.usernameInput && !this.usernameInput.validateOrShowError()) {
+    if (this.usernameInput && !this.usernameInput.canPlay()) {
       return;
     }