When a state file is corrupt, unreadable, or from a newer build, rename
it to <name>.json.bak (replacing any older backup) before loading empty,
so the next save can't silently destroy it and the user can inspect or
recover the contents.
Adds a lib target (soulseek_rs_tui) exposing cli/models/persist so
integration tests can drive the persistence pipeline: state and config
survive a simulated restart through the real files, with the incomplete
download flagged for auto-resume. The lib e2e suite gains a
register-then-relogin test against soulfind proving the stored-credential
flow's server assumptions. cargo clippy --all-targets and cargo fmt are
clean.
The main TUI now loads state on startup — search history restored as
inert entries, saved chat rooms rejoined on the server, and incomplete
downloads (including failed/timed-out ones) automatically re-enqueued —
and saves a diffed snapshot each loop tick and on exit, so only changed
files are rewritten.
StateStore writes {version, data} envelopes under the platform data dir
with atomic tmp+rename writes and a per-file migration chain (data at
version i is upgraded by MIGRATIONS[i]). Missing, corrupt, or
newer-than-known files load as empty so state can never block startup.
SecretStore trait with a keyring-backed implementation (macOS Keychain,
Windows Credential Manager, Linux Secret Service) under service
soulseek-rs. Precedence: --password/env > keychain > password_cmd from
config.toml. Keychain failures degrade to not-found so headless boxes
fall through to password_cmd.
New persist module in the binary crate (lib stays zero-dep): FileConfig
loaded from a platform-appropriate config path via the directories crate,
with resolution precedence CLI/env (clap) > config.toml > built-in
defaults. Clap defaults move into the resolver so the file layer can sit
between.
michel