feedback5: the browser battle loads data/backups.json too, so a stand-in fights the same in the browser as on the server

public/js/battle/runner.js

@@ -105,7 +105,7 @@ export function compactHeld(list) {
   return list.filter((x, i) => (x[0] === 'status' ? last.get(`s:${x[1]}:${x[2]}`) === i : x[0] === 'skill' ? last.get(`k:${x[1]}`) === i : true));
 }
 /** Data files the simulation reads (DataSource + content/support gameData()). */
-export const SIM_DATA_FILES = Object.freeze(['chess', 'enemies', 'tokens', 'stages', 'waves', 'bonds', 'items', 'garrisons', 'bands', 'effects']);
+export const SIM_DATA_FILES = Object.freeze(['chess', 'enemies', 'tokens', 'stages', 'waves', 'bonds', 'items', 'garrisons', 'bands', 'effects', 'backups']);
 
 /** Request failures after which a b.result counts as never delivered (re-sent on resume / b.start). */
 export const LOST_RESULT_CODES = Object.freeze(['DISCONNECTED', 'OFFLINE', 'TIMEOUT']);