Fortress Clash

Fixed the reported issue: progress was not restored after a reload. Root cause: bridge.storage.get() returns the saved value already parsed as an object, while the game expected a JSON string and parsed it again, which threw and silently discarded the save. Changes: - storage.get() now accepts both shapes (object and string). - The save is loaded BEFORE gameplay is shown: a loading screen is displayed and input is ignored until storage.get() resolves, so a fresh default save can no longer overwrite real progress during startup. - Saves carry a revision counter, so after "finish a level, then buy an upgrade" the newest copy always wins instead of an older one at the same level. - Any pending write is flushed on page hide / unload, so the last action before a reload is never lost. Verified in the QA tool: state written before Reload game is fully restored after it.