feat(tui): scrollback-first TUI rewrite (tui_sb) - #441
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Replace _history_lines (pre-rendered) with _blocks (source + kind) so _repaint_screen can re-render every chip, banner, user panel at the current width. \x1b[3J wipes scrollback on resize/Ctrl+L so the entire conversation reflows, not just the visible viewport. SIGWINCH delivery via self-pipe + select() — PEP 475 auto-retry on os.read makes signal-driven InterruptedError unreliable under iTerm split panes, so a dedicated pipe wakes the loop deterministically. Streaming tracks a single _streaming_block whose source grows monotonically through safe-position commits; mid-stream resize re-renders both the committed source and the volatile live_tail. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
macOS Terminal.app quantises truecolor to its nearest 256 slot (so #5e6ad2 lavender lands on slot 62 #5f5fd7, visibly more blue) and renders \x1b[2m as a heavy multiply instead of a gentle blend, producing the "blue border + heavy shadow" against iTerm's identical code. Branch on TERM_PROGRAM: iTerm keeps its truecolor accent and \x1b[2m dim; Apple_Terminal switches to pinned 256-slot accent (105) and an explicit mid-gray (244) for dim. Box border (146) was already 256-slot so it carries unchanged. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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feat(tui): scrollback-first TUI rewrite (tui_sb)
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feat(tui): scrollback-first TUI rewrite (tui_sb)
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feat(tui): scrollback-first TUI rewrite (tui_sb)
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Scrollback-first terminal UI — finalized output goes to the terminal's
real scrollback buffer (no alt-screen), so native Cmd+C / mouse select /
cross-page copy work cleanly. Only a small bottom region is live-redrawn
(streaming tail + status bar + input box).
Motivation: v2 (Textual-based) has ANSI escape leakage during streaming,
broken native copy due to alt-screen, race conditions between Textual's
event loop and agent's display_queue, and heavy deps (Textual+Tkinter+PIL).
handles scroll/search natively. Live region uses cursor-addressed
repaints with exact row accounting (CJK cell-width aware, no
soft-wrap drift).
readline bindings, history (up/down), @file attachment with glob.
review), /rewind N (checkpoint restore), /continue (session restore),
/clear, /cost, /verbose (tool call audit viewer in alt-screen overlay),
/export, /stop.
via renderer.py strips stray CSI/OSC before Rich parse.
checkpoint_index.py indexes rewind points.
AskUserEvent/DoneEvent from agent's display_queue — decouples UI from
agent internals.
Files: frontends/tui_sb/ (new directory, 17 source files + README.md).