Fix garbage row visibility by pushing current piece up

When garbage rows are added to a player's board, the current falling
piece was not being adjusted, causing it to appear stuck while the
board shifted. This fix increments the piece's Y position when garbage
is received and eliminates the player if the piece is pushed above
the visible board.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/index.js

@@ -395,7 +395,15 @@ function addGarbageToPlayer(player) {
   const garbageRow = Array(BOARD_WIDTH).fill(GARBAGE_COLOR);
   garbageRow[Math.floor(Math.random() * BOARD_WIDTH)] = 0;
   player.board.push(garbageRow);
-  // Elimination is handled by spawnPiece when a new piece can't fit
+
+  // Push current piece up by 1 row if it exists
+  if (player.currentPiece) {
+    player.currentPiece.y++;
+    // Eliminate if the piece is pushed above the board
+    if (!isValidPosition(player.currentPiece, player.currentPiece.x, player.currentPiece.y, player.board)) {
+      player.eliminated = true;
+    }
+  }
 }
 
 function getGhostY(piece, board) {