feat: add PGN4Web block support and integrate chess game replay features

Implemented a new PGN4Web block with a PHP snippet for game replay functionality. Updated blueprints with PGN-specific fields, modified layout and blockpage templates, and included necessary JavaScript and assets for interactive chess game rendering. Enhanced memorial page with replayable game content.

site/snippets/blocks/pgn4web.php

@@ -0,0 +1,35 @@
+<script>
+    SetPgnUrl("<?= $block->pgn()->toFile()->url() ?>");
+    SetImagePath("/assets/pgnviewer/images");
+    SetImageType("png");
+    SetHighlightOption(true);
+    SetGameSelectorOptions(null, false, 0, 0, 0, 15, 15, 0, 10);
+    SetCommentsIntoMoveText(false);
+    SetCommentsOnSeparateLines(false);
+    SetAutoplayDelay(1000);
+    SetAutostartAutoplay(false);
+    SetAutoplayNextGame(false);
+    SetInitialGame(1);
+    SetInitialVariation(0);
+    SetInitialHalfmove(0, false);
+    SetShortcutKeysEnabled(false);
+
+    SetLiveBroadcast(1, false, false, false, false);
+</script>
+
+
+<div class="gap-2 grid grid-cols-1 lg:grid lg:grid-cols-2 lg:px-8 max-w-7xl mx-auto px-4 py-8 sm:px-6 text-black">
+    <div>
+        <div class="w-full" id="GameBoard"></div>
+        <div class="hover:cursor-pointer" id="GameButtons"></div>
+    </div>
+    <div>
+        <div>
+            <div id="GameEvent" class="text-2xl py-2"></div>
+            <div id="GameWhite" class="text-xl pt-2"></div>
+            <div id="GameBlack" class="text-xl"></div>
+            <div id="GameResult" class="text-xl"></div>
+        </div>
+        <div id="GameText" class="py-2"></div>
+    </div>
+</div>

site/snippets/layout.php

@@ -11,6 +11,10 @@
             'assets/css/chess.css'
         ]) ?>
 
+        <?= js([
+            'assets/js/pgn4web.js'
+        ]) ?>
+
         <link rel="shortcut icon" type="image/x-icon"
               href="<?= url('assets/favicon.ico') ?>">
     </head>