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* feat(terminal): add reconnection buffer support for persistent sessions Fix two related issues: 1. Reconnecting to persistent sessions shows blank screen - server now automatically sends historical buffer on reconnection via SessionState machine with pending_buffer, eliminating the need for client-initiated buffer requests. 2. Terminal output before view ready causes NaN errors - buffer output chunks on client side until terminal view has valid dimensions, then flush in order on first valid resize. Rust side: - Introduce SessionState enum (Closed/Active) replacing bool is_opened - Auto-attach pending buffer on reconnection in handle_open() - Always drain output channel in read_outputs() to prevent overflow - Increase channel buffer from 100 to 500 - Optimize get_recent() to collect whole chunks (avoids ANSI truncation) - Extract create_terminal_data_response() helper (DRY) - Add reconnected flag to TerminalOpened protobuf message Flutter side: - Buffer output chunks until terminal view has valid dimensions - Flush buffered output on first valid resize via _markViewReady() - Clear terminal on reconnection to avoid duplicate output from buffer replay - Fix max_bytes type (u32) to match protobuf definition - Pass reconnected field through FlutterHandler event Signed-off-by: fufesou <linlong1266@gmail.com> * fix(terminal): add two-phase SIGWINCH for TUI app redraw and session remap on reconnection Fix TUI apps (top, htop) not redrawing after reconnection. A single resize-then-restore is too fast for ncurses to detect a size change, so split across two read_outputs() polling cycles (~30ms apart) to force a full redraw. Also fix reconnection failure when client terminal_id doesn't match any surviving server-side session ID by remapping the lowest surviving session to the requested ID. Rust side: - Add two-phase SIGWINCH state machine (SigwinchPhase: TempResize → Restore → Idle) with retry logic (max 3 attempts per phase) - Add do_sigwinch_resize() for cross-platform PTY resize (direct PTY and Windows helper mode) - Add session remap logic for non-contiguous terminal_id reconnection - Extract try_send_output() helper with rate-limited drop logging (DRY) - Add 3-byte limit to UTF-8 continuation byte skipping in get_recent() to prevent runaway on non-UTF-8 binary data - Remove reconnected flag from flutter.rs (unused on client side) Flutter side: - Add reconnection screen clear and deferred flush logic - Filter self from persistent_sessions restore list - Add comments for web-related changes Signed-off-by: fufesou <linlong1266@gmail.com> --------- Signed-off-by: fufesou <linlong1266@gmail.com>
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