1dfc614cc5
Wire-compatible with the Python client's _ft protocol (offer/accept/reject/ chunk/done, 64KB chunks, SHA-256 verified), over the encrypted channel: - ft.rs: read_payload (file or tar'd directory), save/extract with a zip-slip guard (relative-only, no .. / absolute; unpack_in double-checks), SHA-256. - /send <file> and /sendd <dir>; receiver sees an offer banner, /accept or /reject; chunks stream in the background and the result is verified + saved to ./downloads (directories extracted in place). - Refactor: all outgoing ws frames now funnel through an mpsc channel drained (batched) by the run loop, so the background chunk-sender and the PTY relay transmit without owning the socket. - ui.rs: pending-offer banner on the input bar. Tests: 7 cargo tests (file + dir tar round-trip, traversal guard, + crypto/sbx). Verified live: two TUIs, file and directory transfer, SHA-256 verified, saved. Note: dropping accepted files into the active sandbox VM dir is a future add-on. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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