fix(ui-conversation): keep the summary suffix on one line

`flex: none` stops the `+n` box shrinking but not its text wrapping, so a
row too narrow for title + separator + suffix broke the one-line summary in
the exact case the slot exists for. Add `white-space: nowrap` and pin the
declaration as CSS text, since jsdom has no layout.

Also align the README's row illustration with the English rendering (the
same sentence's plan-strip clause already used it), and record the two
deferred review findings in the Agent Note so they survive merge.

.agents/notes/implemented/feature/2026-07-26-todo-parallel-in-progress.md

@@ -45,6 +45,10 @@ The row takes `planSummary` in `toolviews/plan-summary.ts`. It names the first a
 
 `summarySuffix` is a slot on `ToolRow` rather than markup owned by the todo row: every toolview renders through that shared component, whose `summary` is a plain ellipsized string with no place for a fragment that must survive the clip. Sitting outside the `.summary` rule, the suffix repeats that rule's `font-size` and `line-height` — the web shell leaves body text at the browser default rather than the row's 14px, so an unstyled span renders visibly larger than the text beside it on a 24px row. An error row drops the suffix, because its collapsed summary is the failure line rather than anything derived from the call args.
 
+## Deferred
+
+Two review findings are recorded here rather than fixed on this branch. The `summarySuffix` span carries no accessible name, so a screen reader reads the count without its noun (`… 实现 fixture 样本 +1`); naming it introduces localized copy with its own test contract, which belongs to an accessibility pass over the whole `ToolRow` summary line rather than to one row. And when the *first* active item's content is unusable — missing, mistyped, or blank once trimmed — the row drops the active clause and the count with it, so a parallel plan renders as bare counts; skipping forward to the first usable active item was rejected because call args are an explicitly unvalidated boundary where model order is the only ordering the row can honour, and dropping the unusable clause alone keeps the `done`/`total` counts, which are trustworthy regardless.
+
 ## Consequences
 
 A todo list can now faithfully mirror parallel execution, and every UI renders several active markers at once: the TUI's per-status prefix needed no change, the plan strip's header counts the active items, and the row needed the derivation above. A composition that sets `allowParallelInProgress: true` no longer rejects a formerly-invalid snapshot shape; one that sets `false` keeps the old rejection, and the durable-log invariant accepts both. The model-facing description changed, which re-recorded the tool-catalog page and every snapshot sidecar carrying the todo schema. No count is recorded here: the set grows with every pinning scenario that lands, and the two point-in-time censuses this note previously carried were both stale within days. The operative rule is that a branch changing the tool description must refresh whichever sidecars landed after it branched — including the numbered `tool-schemas.<n>.expected.json` files pinning a subagent class, whose schemas the parent scenario does not cover — and `pnpm run test:snapshot:refresh` does it keylessly over the whole corpus. The web fixture's todo sample now runs two items `in_progress`, so both fixture-driven surfaces render a parallel plan. `packages/client/ui-conversation/tests/todo-panel.spec.tsx` pins the row summary and the plan strip over src, the ACP `todo-write` scenario records a three-todo plan with two active, and `apps/web/tests/todo-row.snapshot.ts` pins both surfaces in the assembled application — booted from the built `packages/client/*/lib/client.js` bundles, so it is the one place the keyed registration and the bundled wiring are under test. That last file records `summary`, `suffix`, and the strip's header as separate fields, so folding the `+N` count back into the summary string changes the expected output even though the concatenated text would read the same.