Name box in the New world panel (t10)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/saves.js

@@ -54,11 +54,12 @@ function deleteWorld(id) {
     if (GAME.worldId === id) { GAME.worldId = ''; GAME.worldName = ''; }
   });
 }
+function cleanWorldName(name, fallback) { return String(name).trim().slice(0, 40) || fallback; }
 function renameWorld(id, name) {
   return worldWrite(async () => {
     const list = await listWorlds(), entry = list.find(w => w.id === id);
     if (!entry) return;
-    entry.name = String(name).trim().slice(0, 40) || entry.name;
+    entry.name = cleanWorldName(name, entry.name);
     await DB.put('worlds', list);
     if (GAME.worldId === id) GAME.worldName = entry.name;
   });