data: add 64 charts and event challenge

src/routes/combination/+page.svelte

@@ -352,6 +352,11 @@
     try {
       const state = JSON.parse(localStorage.getItem(STORAGE_KEY) ?? 'null') as SavedState | null;
       if (state) applySavedState(state);
+      if (eventMode && currentEvent) {
+        const challengeSongId = Object.keys(currentEvent.challengeSongBonusCardIds)
+          .find((songId) => songs.some((song) => song.id === songId));
+        if (challengeSongId) selectedSongId = challengeSongId;
+      }
     } catch {
       localStorage.removeItem(STORAGE_KEY);
     }