SteamFlow roadmap

References from legacy OpenSteamClient

OpenSteamworks.Client/Login/LoginManager.cs: credential + steam-guard + token exchange behavior.
OpenSteamworks.Client/Login/LoginPoll.cs: polling semantics for auth session state and token generation.
OpenSteamworks.Client/Apps/Library/LibraryManager.cs: Steam library parsing references.
tools/binaryvdfparser_src/Program.cs: binary VDF support ideas for appinfo.vdf.

✅ SteamFlow uses steam-vent 0.4.2 full auth pipeline (Connection::login / Connection::access), including:
- RSA credential exchange and auth-session creation.
- Steam Guard challenge handling.
- PollAuthSessionStatus token retrieval.
- Refresh-token-based client logon and persisted session restore.

✅ SteamFlow uses steam-vent 0.4.2 full auth pipeline, including persisted sessions.
✅ Improved Steam Guard UX with confirmation-type specific hints.
✅ Integrated 4-phase download pipeline logic (manifest id -> security -> manifest -> chunks).
✅ Improve download UI with real-time progress reporting and better error handling.
✅ Integrate PICS metadata fetch into the main SteamClient launch flow.
Add per-game launch profiles (env vars, custom args, compat tool preset).
✅ Add settings view for Proton runtime and Steam library path discovery.
Extend CI to publish signed .deb artifacts from tags.
✅ Implement Steam Cloud Sync (Enumerate/Download/Upload).
✅ Add Depot Browser developer tooling (depot list, manifest tree, single-file download).
✅ Harden library scanning fallback and appmanifest parse diagnostics.
✅ Robust metadata and image lazy-fetching via Steam Web API.