Tool-call cards and grouping, with the state a result never arrived in

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P1b (docs/RUST.md). `transcript-ui/src/tool.rs` draws a card per tool
call and a group per run: collapsed, a card is its name and the one-line
summary `parse_tool_input` derives; open, it is the description, the
input (highlighted, on the verbatim surface) and the output, capped with
a "Show all N lines". A run is one surface with a heading and a chevron
bar at its foot, so it closes from either end.

Three things worth knowing.

**A collapsed card lays out its summary line and nothing else.** The
fixture's tool outputs are tens of kilobytes and a collapsed card never
builds a widget for one -- `collapsed_cards_shape_only_their_summary_
lines` opens a three-card group over 88 kB of output each and asserts the
text-shape count equals the same group's over three bytes (17 either
way; 17 against 20 when the discipline is deliberately broken, so the
test is real).

**A result arriving replaces one card.** `ToolRow::apply_calls` is the
group's half of `RowBlocks::apply_delta`'s rule, and `build_row` now
hands back one `TailRow` -- blocks for a message, cards for a run --
rather than two mechanisms chosen at each call site.

**Every tap is a tap**: `GestureOutcome::Tapped` out of the `DragArbiter`
`Selection` already owns, so a drag that started on a card scrolls the
transcript instead of opening it.

Three defects found by looking at the render, all recorded with their
repro in docs/IRIS_TODO.md: a `Span` of padded children inside another
`Span` places them a slot out of step (worked around by building the
group as one span, which costs the 4dp inset); `scrollable_on(Axis::X)`
on a non-editable text draws nothing, so a card's command is clipped
rather than pannable; and `NotoSans-Regular` has no U+25B8/25BE/25B4 at
all, so the expander mark is set in the monospace face.

Screenshots: docs/bench/p1b-2026-09-06/.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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irisandClaude Fable 5.1 committed 2026-09-06 22:49:51 -04:00

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