feat(gui): generic command flow node and the conversation.chat.commandview keyed slot

The FoldAdapter folds the log-only command/run + command/done pair (paired
by commandId) into a CommandNode outside the surface fold and merges the
nodes into the flow by seq; cross-window cuts soft-fall like tool pairs (a
done-only window builds the node from the done, a run with no done renders
as still executing). ChatView renders command nodes through the new keyed
'conversation.chat.commandview' hole (key = command name) with
GenericCommandCard — a stripped-down GenericToolCard showing the command
line and outcome text — as the render-site fallback, so any slash command
renders durably with zero registration and survives refresh, other tabs,
and resume via the mux-broadcast events.

packages/client/ui-conversation/tests/chat-view.spec.tsx

@@ -7,7 +7,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { Profiler } from 'react'
 import { act, cleanup, fireEvent, render } from '@testing-library/react'
 import type {
-  AssistantMessageNode, ConversationNode, ConversationSnapshot, RunningToolCall, SessionId,
+  AssistantMessageNode, CommandNode, ConversationNode, ConversationSnapshot, RunningToolCall, SessionId,
   SessionListState, ToolResultNode, UserMessageNode, WorkspaceListState,
 } from '@deepseek-ai/dsh-client-runtime/client'
 import { bindSnapshotSelector } from '@deepseek-ai/dsh-client-web-react'
@@ -363,4 +363,41 @@ describe('ChatView', () => {
     const view = render(<h.ChatView {...h.props} />)
     expect(view.getByText(/等待审批/)).toBeTruthy()
   })
+
+  it('renders command nodes as durable rows: settled text, error state, executing spinner, run-less soft-fall', () => {
+    const command = (over: Partial<CommandNode>): CommandNode => ({
+      kind: 'command', seq: 5, time: 5_000, commandId: 'cmd-1',
+      name: 'plan', line: '/plan', outcome: { kind: 'success', text: '已进入 plan mode' },
+      ...over,
+    })
+    // Settled success: the command line is the title, the outcome text the summary.
+    const settled = makeHarness({ nodes: [user(1, 'hi'), command({})] })
+    const view = render(<settled.ChatView {...settled.props} />)
+    expect(view.getByText('/plan')).toBeTruthy()
+    expect(view.getByText('已进入 plan mode')).toBeTruthy()
+
+    // Error outcome flips the row state; a text-less error gets the default copy.
+    const failed = makeHarness({
+      nodes: [command({ seq: 6, commandId: 'cmd-2', outcome: { kind: 'error' } })],
+    })
+    const fv = render(<failed.ChatView {...failed.props} />)
+    expect(fv.container.querySelector('[data-state="error"]')).not.toBeNull()
+    expect(fv.getByText('命令失败')).toBeTruthy()
+
+    // Still executing: running state with the executing copy.
+    const executing = makeHarness({
+      nodes: [command({ seq: 7, commandId: 'cmd-3', outcome: null })],
+    })
+    const xv = render(<executing.ChatView {...executing.props} />)
+    expect(xv.container.querySelector('[data-state="running"]')).not.toBeNull()
+    expect(xv.getByText('执行中…')).toBeTruthy()
+
+    // Cross-window soft-fall (run page truncated): generic title, outcome preserved.
+    const orphan = makeHarness({
+      nodes: [command({ seq: 8, commandId: 'cmd-4', name: null, line: null, outcome: { kind: 'success' } })],
+    })
+    const ov = render(<orphan.ChatView {...orphan.props} />)
+    expect(ov.getByText('命令')).toBeTruthy()
+    expect(ov.getByText('已完成')).toBeTruthy()
+  })
 })