- Disabled game mode selector while matchmaking is active.

- Updated match start header in Player to match new UI theme.
- Reworked TicTacToe layout with dark theme, centered layout, and Framer Motion transitions.
- Added animated header bar and unified styling across Player, Board, and main screen.
- Improved opacity/transition behavior for the board based on session state.
- Cleaned up unused code and reorganized match data callback handling.

src/tictactoe/Player.tsx

@@ -147,6 +147,7 @@ export default function Player({
 
             <select
               value={selectedMode}
+              disabled={isQueueing}
               onChange={(e) => setSelectedMode(e.target.value)}
               style={{
                 padding: "8px",
@@ -269,8 +270,8 @@ export default function Player({
               textAlign: "center",
             }}
           >
-            <h2 style={{ fontSize: "22px", color: "#f1c40f" }}>
-              Go {session.username}!
+            <h2 style={{ marginBottom: "10px" }}>
+              Go, <span style={{ color: "#2ecc71" }}>{session.username}</span>
             </h2>
           </motion.div>
         )}