feat(web): answerable ask_user_question flow with toolview verdict row

The pending question now owns exactly two surfaces: the redesigned
QuestionComposer takeover (footer pager, checkbox multi-select,
always-visible custom input, locale-injected bilingual chrome) collects
the answers, and a dedicated ask_user_question toolview row reports the
interaction outcome — waiting, N/M answered, cancelled (ASK_CANCELLED),
or interrupted with stopped semantics (ASK_ABORTED). PendingCard narrows
to approval waits only. Toolview leading icons and the hover chevron
unify on the tertiary label color, the checklist glyph matches the
14px figma extract, and dev-watch registers CSS modules so css-only
edits rebuild.

packages/client/ui-conversation/tests/coverage-tails.spec.tsx

@@ -1,20 +1,17 @@
 // @vitest-environment jsdom
 // Branch tails the acceptance specs do not reach: ToolRow stopped-state dot,
-// PendingCard question arm, bash sample state dots, the node-half empty
-// apply, and AssistantMarkdown reasoning/unknown block arms.
+// bash sample state dots, the node-half empty apply, and AssistantMarkdown
+// reasoning/unknown block arms.
 
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { cleanup, render } from '@testing-library/react'
 import { createSnapshotStore } from '@deepseek-ai/dsh-client-runtime/client'
 import { bindSnapshotSelector } from '@deepseek-ai/dsh-client-web-react'
 import type { RunningToolCall, SessionId, SessionListState, ToolResultNode } from '@deepseek-ai/dsh-client-runtime/client'
-import { PendingWait } from '@deepseek-ai/dsh-client-runtime/client'
-import { RpcId } from '@deepseek-ai/dsh-client-connection/client'
 import type { ToolRowOwnerProps, ToolRowProps } from '@deepseek-ai/dsh-client-ui-conversation/client'
 import { apply as nodeApply } from '../src/index.ts'
 import { GenericToolCard } from '../src/client/chat/GenericToolCard.tsx'
 import { ToolRow } from '../src/client/chat/ToolRow.tsx'
-import { PendingCard } from '../src/client/chat/PendingCard.tsx'
 import { AssistantMarkdown } from '../src/client/chat/AssistantMarkdown.tsx'
 import { BashRow } from '../src/client/toolviews/bash-sample.tsx'
 
@@ -33,13 +30,6 @@ describe('tails', () => {
     expect(view.container.querySelector('[data-state="stopped"]')).not.toBeNull()
   })
 
-  it('PendingCard renders the question arm with its count', () => {
-    const view = render(
-      <PendingCard item={new PendingWait('question', RpcId('r1'), 's1' as SessionId, { questions: [{}, {}] } as PendingWait<'question'>['payload'], vi.fn())} />,
-    )
-    expect(view.getByText(/等待回答（2 题）/)).toBeTruthy()
-  })
-
   it('AssistantMarkdown renders reasoning as a Think row and unknown blocks as JSON fallback', () => {
     const view = render(
       <AssistantMarkdown