Rework the chess page into a chess.com-style layout

Board with player bars and captured trays on the left, a game panel with
move list, status, and action buttons on the right. The page is locked to
the viewport (no scrolling); on phones the panel collapses into a slide-up
menu reachable from a slim status bar. Cache-busts the chess scripts too.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

JoshHeaps.Net/wwwroot/css/chess/game.css

@@ -1,12 +1,4 @@
-#boardContainer {
-    position: relative;
-    width: fit-content;
-    margin: 2vw auto;
-}
-
-#chessBoard {
-    width: 60vw;
-    height: 60vw;
+#chessBoard {
     display: grid;
     grid-template-columns: repeat(8, 1fr);
     grid-template-rows: repeat(8, 1fr);