feat: handle non-letter characters in actor names with separator rows

Display spaces, hyphens and other non-letter characters as static cells
instead of input fields, and add separator rows in the grid for
non-alphabetic characters in the main actor's name.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Service/GameGridGenerator.php

@@ -71,7 +71,25 @@ class GameGridGenerator
         $rightSize = 0;
         $grid = [];
 
-        foreach ($game->getRows() as $row) {
+        $mainActorChars = str_split($game->getMainActor()->getName());
+        $rows = $game->getRows()->toArray();
+        $rowIndex = 0;
+
+        foreach ($mainActorChars as $char) {
+            if (!preg_match('/[a-zA-Z]/', $char)) {
+                $grid[] = [
+                    'separator' => $char,
+                ];
+                continue;
+            }
+
+            $row = $rows[$rowIndex] ?? null;
+            ++$rowIndex;
+
+            if ($row === null) {
+                continue;
+            }
+
             $actor = $row->getActor();
             $pos = $row->getPosition();