0.1.13

Removed dead code: unused struct fields, error variants, and #[allow(dead_code)] annotations.
Renamed chat_name to username throughout the server crate for consistency.
Added shared binary parsing helpers (extract_length_prefixed_string, validate_binary_length) to reduce duplicated parsing logic.
Replaced bare .unwrap() on lock acquisitions with descriptive .expect() messages.
Replaced explicit drop() calls with scoped blocks for clearer lock lifetimes.
Extracted file transfer logic into dedicated modules on both client and server.
Replaced magic numbers with named constants across client, server, and shared crates (DEFAULT_PORT, RECONNECT_DELAY, FILE_HEADER_OVERHEAD, TLS_HANDSHAKE_TIMEOUT, HEADER_SIZE, MessageTypes byte constants).
Replaced unsafe as u8 and as usize casts with safe TryFrom conversions and added a push_length_prefixed helper for length-prefixed string encoding.
Added extract_field! macro (client) and parse_field helper (server) to reduce repetitive binary parsing boilerplate.
Added require_username helper on the server to eliminate duplicated username-check match blocks.
Implemented Display for ChatClientError.
Split handlers.rs (724 lines) into handlers.rs, user_handlers.rs, and message_handlers.rs (246 + 294 + 188 lines).
Consolidated duplicate completer.rs and readline_helper.rs from client and server into shared crate (shared::completer, shared::readline).

0.1.12

Ghost session reclaim: Reconnecting clients can now reclaim their own "ghost" session instead of being renamed. If you disconnect and reconnect quickly (before the 60s timeout), and your old session is still active, the server will recognize you and let you take over your username seamlessly.

Increased file transfer size limit from 10MB to 100MB.
File transfers now require recipient acceptance. Sender uses /send <user> <file>, recipient must /accept <sender> or /reject <sender>.

Added client/server version checking. Clients with mismatched versions are disconnected with a link to upgrade instructions.

Status now persists across reconnections but is cleared on explicit /quit, kick, or ban.

Refactored command parsing to use shared command constants, eliminating duplication between command definitions and input parsing.