StS2 Launcher Mod

Features Steam authentication Login via SteamKit2 with Steam Guard 2FA support. Game file download Depot download directly from Steam, with update checking. Cloud saves Full Steam cloud sync via SteamKit2's CCloud API, with timestamp-aware conflict resolution and non-blocking background uploads. Local backup Full-tree save snapshots to external storage, preserving the original folder layout and filenames (no .bak renaming). The Local Backup button takes a manual snapshot on demand (Saves/manual/<ts>/); the pre-PLAY cloud handshake auto-snapshots once per launch (Saves/auto/<ts>_match/, or Saves/auto/<ts>_conflict/{kept,discarded}/ so a wrong KeepLocal/KeepCloud choice is recoverable). Manual sets are kept indefinitely; auto sets are FIFO-capped at the newest 10. Mobile adaptation Touch input, UI scaling, layout adjustments, and app lifecycle handling via Harmony runtime patches. LAN multiplayer UDP broadcast discovery and manual IP join. Shader warmup Vulkan pipeline cache persistence and canvas ubershader support to eliminate first-encounter stutters. Credential security Steam refresh tokens encrypted at rest via Android Keystore (AES-256-GCM, hardware-backed TEE).