fix: improve endgame clock and gameplay stability

resources/GachaSandboxPolicy.json

@@ -26,7 +26,7 @@
  "asset_verification_note": "2026-10-24 Player.log: all six captured banner prefab paths were checked via RPG.Client.GlobalVars.s_AssetMgr.Exists without loading. Standard and Novice exist; all four captured limited character/lightcone prefabs (UI/Drawcard/GachaPanelLimited/*) are absent from the installed asset manifest. The captured Seele prefab UI/Drawcard/GachaPanelLimited/AvatarGacha_1102.prefab previously caused UIPrefabLoader ArgumentNullException inside GachaMainPage._create_pools_panel when sent. Do not enable a prefab solely because it exists in the flat table.",
  "mapped_banner_preview_count": 0,
  "native_presentation": {
-  "enabled": false,
+  "enabled": true,
   "template_gacha_id": 1001,
   "source": "Current initialized Standard-pool native cloning and GetInfo pre-bind restoration; user confirmed one-banner native frame, splash art and horizontal thumbnail on 2026-10-25. Five-star mapped tabs only, with three matching sandbox four-star cards; full multi-tab draw/exit still awaiting Client confirmation."
  },