used msUntil start because server has different time than client

src/server/Server.ts

@@ -24,8 +24,11 @@ const gm = new GameManager(getConfig())
 
 // New GET endpoint to list lobbies
 app.get('/lobbies', (req, res) => {
+    const now = Date.now()
     res.json({
-        lobbies: gm.gamesByPhase(GamePhase.Lobby).map(g => ({id: g.id, startTime: g.startTime(), numClients: g.numClients()})),
+        lobbies: gm.gamesByPhase(GamePhase.Lobby)
+            .map(g => ({id: g.id, msUntilStart: g.startTime() - now, numClients: g.numClients()}))
+        // .sort((a, b) => a.startTime - b.startTime),
     });
 });