Port numbers are 16-bit; the codebase had listen_port/listener_port
typed as u32, inconsistent with PeerAddress.port (already u16).
Migrate the type all the way through the CLI, config, ClientSettings,
Client, ServerActor, and the listener entry point. The wire format is
preserved: build_set_wait_port_message now takes u16 and widens to u32
via .into() before write_int32. Also rename DEFALT_LISTEN_PORT to
DEFAULT_LISTEN_PORT.
Splits the downloads area 60/40 with a new info pane that adapts to the
selected download's status: header (filename, user, size, status, save
path, bitrate, length) plus queued-specific fields (queue position, peer
slots, peer upload speed) or live progress/speed/ETA when transferring.
Plumbs queue position via a new ClientOperation::PlaceInQueueUpdate so
PlaceInQueueResponse messages from peers reach DownloadStore, and threads
search-time metadata (bitrate, length, peer slots/speed) onto Download
through a new download_with_metadata entry point.
Add SoulseekRs::LockPoisoned variant and a small RwLockExt/MutexExt
helper module exposing read_safe/write_safe/lock_safe that map
PoisonError to that variant. Walk every non-test lock acquisition
across client, peer/server actors, peer registry, listener and the
thread pool: propagate via ? where the function returns Result, log
and degrade to a sensible default (return early, false, None, empty)
where it does not. Client::connect now returns Result so the CLI can
surface the failure instead of panicking.
michel