fix(crazygames): guest username on logout, hide fullscreen, in-game pop-ups (#4538)

Addresses four requests from the CrazyGames platform team.
Supersedes #4520 (closed when its branch was renamed to `crazygames`).

## 1. Username reverts to guest on CrazyGames logout
When a player logged into their CrazyGames account and then logged out,
the username stayed the CrazyGames name. It now reverts to a fresh guest
(`AnonXXX`) name. A `crazyGamesLoggedIn` flag guards this so it only
fires on a real login→logout transition (not on the initial "not logged
in" state, which would otherwise wipe a stored name).

## 2. Fullscreen button hidden on CrazyGames
CrazyGames provides its own fullscreen control in the game frame, so our
in-game fullscreen button is now hidden when running on CrazyGames (and
unchanged everywhere else).

## 3. Native browser prompts → in-game pop-ups
The `showInGameConfirm()` / `showInGameAlert()` helpers (promise-based,
callable from non-Lit contexts like WebSocket/popstate handlers) drive
the existing shared `<confirm-dialog>` component, so styling stays
consistent with the rest of the app. Every native `confirm()`/`alert()`
shown **during gameplay** now uses it:
- Exit-game confirmation (right sidebar + browser-back path)
- Kick-player confirmation
- Host-left notice (dispatches leave-lobby only after dismiss,
preserving the old blocking UX)
- Connection-refused notice (also removes a stale `// TODO: make this a
modal`)

## 4. `gameplayStop` when Settings menu / pop-up is open
- The pop-up helpers report `gameplayStop()` while shown and
`gameplayStart()` on dismiss.
- Settings + Graphics Settings modals now report `gameplayStop` whenever
the menu is open — previously it only fired when the modal *also* paused
the sim (singleplayer / lobby-creator), so regular multiplayer players
never triggered it. Also fixes graphics-settings so gameplay resumes
correctly on close for those players.

## Scope
Per request, this covers **in-game dialogs only**. The main-menu native
alerts (store/checkout, account, subscriptions, friends, login) were
intentionally left as-is.

## Testing
- `tsc --noEmit`, `eslint`, and `prettier --check` all pass.
- Verified the confirm and alert pop-ups render correctly in the running
app (shared `<confirm-dialog>`, danger/warning variants), resolve their
promises, and tear down their portal.
- CrazyGames-iframe-only behaviors (username revert, `gameplayStop`,
fullscreen hiding) are verified by code inspection — they require
running inside the actual CrazyGames frame.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/client/Main.ts

@@ -32,6 +32,7 @@ import "./GoogleAdElement";
 import { HelpModal } from "./HelpModal";
 import "./HomepagePromos";
 import { HostLobbyModal as HostPrivateLobbyModal } from "./HostLobbyModal";
+import { showInGameConfirm } from "./InGameModal";
 import { JoinLobbyModal } from "./JoinLobbyModal";
 import "./LangSelector";
 import { LangSelector } from "./LangSelector";
@@ -559,6 +560,13 @@ class Client {
       onJoinChanged();
     };
 
+    const leaveGame = () => {
+      crazyGamesSDK.gameplayStop().then(() => {
+        // redirect to the home page
+        window.location.href = "/";
+      });
+    };
+
     const onPopState = () => {
       if (this.currentUrl !== null && this.lobbyHandle !== null) {
         console.info("Game is active");
@@ -566,23 +574,20 @@ class Client {
         if (!this.lobbyHandle.stop()) {
           console.info("Player is active, ask before leaving game");
 
-          const isConfirmed = confirm(
-            translateText("help_modal.exit_confirmation"),
+          // We can't block navigation on an async confirmation, so restore the
+          // history entry immediately and only leave once the player confirms.
+          history.pushState(null, "", this.currentUrl);
+          showInGameConfirm(translateText("help_modal.exit_confirmation")).then(
+            (isConfirmed) => {
+              if (isConfirmed) leaveGame();
+            },
           );
-
-          if (!isConfirmed) {
-            // Rollback navigator history
-            history.pushState(null, "", this.currentUrl);
-            return;
-          }
+          return;
         }
 
         console.info("Player is not active, leave the game immediately");
 
-        crazyGamesSDK.gameplayStop().then(() => {
-          // redirect to the home page
-          window.location.href = "/";
-        });
+        leaveGame();
       } else {
         console.info("Game not active, handle hash update");