Merge pull request #880 from deepseek-harness/feat/agent-action

feat(ui-conversation): implement finalized IconActions with clock for user and assistant messages

.agents/notes/implemented/feature/2026-07-29-web-message-icon-actions-and-clock.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-07-29-web-message-icon-actions-and-clock.md
+2026-07-29-web-message-icon-actions-and-clock.md: e0072458e4c0d3e37998b5564ad14ce17aa41515
+2026-07-29-web-message-icon-actions-and-clock.zh.md: 1cc25a9656e7a100d78dd3b6b3675ca490f455f9

.agents/notes/implemented/feature/2026-07-29-web-message-icon-actions-and-clock.md

@@ -0,0 +1,27 @@
+# Agent Note: Web message IconActions and clocks
+
+Status: implemented
+
+English | [中文](2026-07-29-web-message-icon-actions-and-clock.zh.md)
+
+## Problem
+
+The web chat user bubble already had copy / branch / edit IconActions but no clock. Finalized assistant narration had no under-body action chrome at all, even though the Harness design shows a copy / branch / clock row after the answer settles. Streaming replies must not flash that chrome mid-token. Memoized rows also keep stable props across midnight, so a one-shot `Date.now()` would leave yesterday's messages stuck on `HH:mm`.
+
+## Decision
+
+**User bubbles prepend a date-aware local clock to the existing IconActions row; finalized assistant nodes append a copy / branch / clock row with `margin-top: 16px`; both seats re-format at the next local midnight.**
+
+Both seats format `node.time` through `formatMessageClock`: same calendar day → `HH:mm`, earlier this year → `M月D日 HH:mm`, other years → `YYYY年M月D日 HH:mm`. `useCalendarDay` is a component-local day tick (timeout to the next local midnight) so memoized rows re-render when the calendar day changes without a new framework hook. `MessageItem` places the label before copy (figma `388:20051`). `AssistantMarkdown` places it after branch (figma `43:32997`) and only when `streaming` is false with a known event time; the streaming tail omits the row. Copy writes joined text blocks. Branch stays a chrome stub. Hover-capable pointers keep both footers opacity-hidden until hover/focus-within. Clipboard write and the clock helpers live in `message-chrome.ts`. The assembled surface is pinned by `apps/web/tests/message-actions.e2e.ts` (cold-seeded history + aria golden); aria normalization collapses every clock shape to `{{clock}}`.
+
+## Alternatives considered
+
+**Show assistant IconActions during streaming.** Rejected: the request is to reveal the row only after output completes; mid-stream chrome would flicker and invite copying a partial answer.
+
+**Wire branch to a real session fork.** Rejected for this change: same rationale as the archived [user IconActions note](../../archived/feature/2026-07-27-user-message-icon-actions.md) — the mutation path is unspecified; the button reserves the design seat.
+
+**Publish the calendar day through a chat store or inject hook.** Rejected: the day tick is presentation-only local state with no cross-entry consumers; a component-local timeout matches the client rule that behavioral hooks may own state that does not subscribe to an external source.
+
+## Consequences
+
+Settled assistant answers expose copy and the event clock immediately; branch stays a stub. User and assistant clocks share the same day/year widening rules and refresh after midnight without a message mutation. Per-message paging remains a deferred footer seat in the package README. Package tests pin the three clock shapes and the midnight widen; the web e2e scenario pins the assembled IconActions chrome.

.agents/notes/implemented/feature/2026-07-29-web-message-icon-actions-and-clock.zh.md

@@ -0,0 +1,27 @@
+# Agent Note: Web 消息 IconActions 与时钟
+
+Status: implemented
+
+[English](2026-07-29-web-message-icon-actions-and-clock.md) | 中文
+
+## 问题
+
+Web 聊天的用户气泡已有复制／分支／编辑 IconActions，但没有时钟。已定稿的 assistant 叙述下方完全没有操作栏，尽管 Harness 设计稿在回答结束后展示复制／分支／时钟。流式回复不得在 token 中途闪出该栏。经 memo 的行在跨午夜时仍保持稳定 props，因此一次性的 `Date.now()` 会让昨日消息一直卡在 `HH:mm`。
+
+## 决策
+
+**用户气泡在既有 IconActions 行前追加感知日期的本地时钟；已定稿的 assistant 节点在正文下追加带 `margin-top: 16px` 的复制／分支／时钟；两边都在下一个本地午夜重新格式化。**
+
+两边都通过 `formatMessageClock` 格式化 `node.time`：同一日历日 → `HH:mm`，同年更早 → `M月D日 HH:mm`，跨年 → `YYYY年M月D日 HH:mm`。`useCalendarDay` 是组件本地的日刻度（定时到下一个本地午夜），因此 memo 行在日历日变化时会重渲染，且不新增框架 hook。`MessageItem` 把标签放在复制之前（figma `388:20051`）。`AssistantMarkdown` 把它放在分支之后（figma `43:32997`），且仅在 `streaming` 为 false 且已知事件时间时渲染；流式尾部省略该行。复制写入拼接后的 text 块。分支仍是 chrome stub。具备 hover 能力的指针在 hover／focus-within 前保持两条 footer 透明。剪贴板写入与时钟辅助函数放在 `message-chrome.ts`。组装面由 `apps/web/tests/message-actions.e2e.ts`（冷 seed 历史 + aria golden）钉住；aria 归一化把每种时钟形态折叠为 `{{clock}}`。
+
+## 曾考虑的方案
+
+**在流式过程中展示 assistant IconActions。** 否决：需求是输出完成后才展示该行；中途 chrome 会闪烁，并诱使复制半截回答。
+
+**把分支接到真实的会话 fork。** 本次否决：与已归档的[用户 IconActions 笔记](../../archived/feature/2026-07-27-user-message-icon-actions.md)同一理由——变更路径尚未规定；按钮只预留设计座位。
+
+**通过 chat store 或 inject hook 发布日历日。** 否决：日刻度只是展示层本地状态，没有跨入口消费者；组件本地 timeout 符合「行为 hook 可拥有不订阅外部源的状态」这一客户端规则。
+
+## 后果
+
+已定稿的 assistant 回答立刻暴露复制与事件时钟；分支仍为 stub。用户与 assistant 时钟共用同一套跨天／跨年加宽规则，并在午夜后无需消息变更即可刷新。逐消息分页仍是包 README 中的暂缓 footer 座位。包级测试钉住三种时钟形态与午夜加宽；Web e2e 场景钉住组装后的 IconActions chrome。

apps/web/tests/message-actions.e2e.ts

@@ -0,0 +1,93 @@
+// Web e2e scenario: message IconActions + clocks. Cold-seeds the seeded-history
+// fixture (zero model calls) and pins the settled conversation aria after the
+// user/assistant footers are focus-revealed — the surface package jsdom tests
+// cannot substitute for (docs/testing.md snapshot rule).
+import { mkdir, readFile, writeFile } from 'node:fs/promises'
+import { join } from 'node:path'
+import { fileURLToPath } from 'node:url'
+import type { Browser, Page } from 'playwright'
+import { chromium } from 'playwright'
+import { afterAll, beforeAll, describe, expect, it, onTestFailed } from 'vitest'
+import {
+  assertFixtureInventory, captureStableAria, compareOrRefreshGolden, fixtureUserPrompts,
+  launchWebScaffold, seedSession, watchConsole, webSnapshotMode, type WebScaffold,
+} from './scaffold.ts'
+import { saveFailureShot } from './support.ts'
+
+const SNAPSHOT_DIR = fileURLToPath(new URL('./snapshots/message-actions', import.meta.url))
+// Borrowed read-only: this scenario needs any settled user+assistant pair, not
+// a new recording (workspace-management / sidebar-scrollbar pattern).
+const SEED = fileURLToPath(new URL('./snapshots/seeded-history/seed.jsonl', import.meta.url))
+const UI_EXPECTED = join(SNAPSHOT_DIR, 'ui.expected.md')
+const MODE = webSnapshotMode()
+const SEED_ID = 'message-actions-web-e2e'
+
+const PROMPT = 'Use the read tool twice in one assistant message: read a.txt and b.txt. Then reply with the single word DONE and stop.'
+
+describe('web e2e: message IconActions and clocks on settled history', () => {
+  let scaffold: WebScaffold
+  let browser: Browser
+  let page: Page
+  let tripwire: ReturnType<typeof watchConsole>
+
+  beforeAll(async () => {
+    scaffold = await launchWebScaffold({})
+    const sessionCwd = join(scaffold.workspaceCwd, 'workspace')
+    await mkdir(sessionCwd, { recursive: true })
+    await writeFile(join(sessionCwd, 'a.txt'), 'alpha\n')
+    await writeFile(join(sessionCwd, 'b.txt'), 'beta\n')
+    const raw = await readFile(SEED, 'utf8')
+    expect(fixtureUserPrompts(raw), 'borrowed seed must carry the drive prompt').toEqual([PROMPT])
+    await seedSession(scaffold, raw, SEED_ID)
+    browser = await chromium.launch()
+    page = await browser.newPage({ viewport: { width: 1680, height: 1000 } })
+    tripwire = watchConsole(page)
+    await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
+    await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
+  }, 120_000)
+
+  afterAll(async () => {
+    await browser?.close()
+    await scaffold?.close()
+  })
+
+  it.skipIf(MODE === 'record')('lists the seeded session and reveals user/assistant IconActions', async () => {
+    onTestFailed(() => saveFailureShot(page, 'web-e2e-message-actions'))
+    const groupRow = page.locator('[role="treeitem"]').first()
+    await groupRow.waitFor({ timeout: 15_000 })
+    await groupRow.click()
+    const sessionRow = page.locator('[role="treeitem"]').nth(1)
+    await sessionRow.waitFor({ timeout: 10_000 })
+    await sessionRow.click()
+    await expect.poll(() => page.getByText('DONE', { exact: true }).count(), { timeout: 15_000 }).toBe(1)
+
+    // Focus-reveal the footers (hover:hover keeps them opacity-hidden until
+    // hover/focus-within). User has three actions; each finalized assistant
+    // text node has copy + branch.
+    const copyButtons = page.getByRole('button', { name: '复制' })
+    await expect.poll(() => copyButtons.count(), { timeout: 10_000 }).toBeGreaterThanOrEqual(2)
+    await copyButtons.first().focus()
+    await expect.poll(() => page.getByRole('button', { name: '在新对话中分支' }).count(), { timeout: 5_000 })
+      .toBeGreaterThanOrEqual(2)
+    await expect.poll(() => page.getByRole('button', { name: '编辑' }).count(), { timeout: 5_000 }).toBe(1)
+  }, 60_000)
+
+  it.skipIf(MODE === 'record')('matches the conversation aria golden with IconActions and clocks', async () => {
+    onTestFailed(() => saveFailureShot(page, 'web-e2e-message-actions-aria'))
+    await page.getByRole('button', {
+      name: '选择模型，当前 deepseek-v4-flash',
+    }).waitFor({ timeout: 10_000 })
+    // Keep a footer focused so opacity-hidden actions stay in the a11y tree
+    // as an active/focused control during the capture.
+    await page.getByRole('button', { name: '复制' }).first().focus()
+    const snapshot = (await captureStableAria(page, '[class*="centerCol"]', scaffold.workspaceCwd))
+      .split(SEED_ID).join('{{seededId}}')
+    await compareOrRefreshGolden(UI_EXPECTED, snapshot, MODE)
+  })
+
+  it.skipIf(MODE === 'record')('issued zero model calls and kept a closed inventory', async () => {
+    expect(tripwire.pageErrors).toEqual([])
+    expect(tripwire.warnings).toEqual([])
+    await assertFixtureInventory(SNAPSHOT_DIR, ['ui.expected.md'])
+  })
+})

apps/web/tests/scaffold.ts

@@ -389,6 +389,11 @@ function normalizeAria(snapshot: string, workspaceCwd: string): string {
     .split(base).join('{{workspace}}')
     .replace(/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/gi, '{{uuid}}')
     .replace(/\b\d+(?:\.\d+)?(?:ms|s|秒)\b/g, '{{duration}}')
+    // Message IconActions clocks widen by calendar day/year; collapse every
+    // shape so goldens stay stable across midnight and year boundaries.
+    .replace(/\d{4}年\d{1,2}月\d{1,2}日 \d{2}:\d{2}/g, '{{clock}}')
+    .replace(/\d{1,2}月\d{1,2}日 \d{2}:\d{2}/g, '{{clock}}')
+    .replace(/(?<!\d)\d{2}:\d{2}(?!\d)/g, '{{clock}}')
 }
 
 /**

apps/web/tests/snapshots/code-mode-round/ui.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: "Using ONE run_code program: run bash `echo CODE_ROUND_OK`, then read the file missing.txt catching its error in the program. Return an object with both outcomes. Then reply DONE and stop."
+- text: "Using ONE run_code program: run bash `echo CODE_ROUND_OK`, then read the file missing.txt catching its error in the program. Return an object with both outcomes. Then reply DONE and stop. {{clock}}"
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -16,6 +16,11 @@
   - img
   - img
   - text: "Think The user wants me to write a single `run_code` program that:"
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
 - button:
   - img
   - img
@@ -28,7 +33,11 @@
   - img
   - text: Think The program ran successfully. Let me now reply DONE as instructed.
 - paragraph: DONE
-- text: cache hit 52% · 17,490 tokens · 1 turns · 2 steps
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 52% · 17,490 tokens · 1 turns · 2 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tests/snapshots/cordis-tool-round/ui.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: "Use only Cordis tools. First call cordis_inspect with what \"temporary\". Then call cordis_mount with this exact code: \"return { name: \\\"snapshot-noop\\\", apply(ctx) {} }\". Read its returned id and call cordis_unmount with that exact id. After all three calls succeed, reply exactly CORDIS_UI_DONE and stop."
+- text: "Use only Cordis tools. First call cordis_inspect with what \"temporary\". Then call cordis_mount with this exact code: \"return { name: \\\"snapshot-noop\\\", apply(ctx) {} }\". Read its returned id and call cordis_unmount with that exact id. After all three calls succeed, reply exactly CORDIS_UI_DONE and stop. {{clock}}"
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -16,6 +16,11 @@
   - img
   - img
   - text: "Think The user wants me to:"
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
 - button:
   - img
   - img
@@ -24,6 +29,11 @@
   - img
   - img
   - text: "Think Good, no temporary plugins running. Now step 2: call cordis_mount with the exact code."
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
 - button [expanded]:
   - img
 - text: Mount temporary Plugin typescript
@@ -33,6 +43,11 @@
   - img
   - img
   - text: "Think The id is \"dyn-1\". Now step 3: call cordis_unmount with that id."
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
 - button:
   - img
   - img
@@ -42,7 +57,11 @@
   - img
   - text: Think All three calls succeeded. I should now reply exactly "CORDIS_UI_DONE" and stop.
 - paragraph: CORDIS_UI_DONE
-- text: cache hit 77% · 66,813 tokens · 1 turns · 4 steps
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 77% · 66,813 tokens · 1 turns · 4 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tests/snapshots/fresh-round-trip/ui.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: "Use the bash tool to run exactly: echo WEB_E2E_OK. Then reply with the single word DONE and stop."
+- text: "Use the bash tool to run exactly: echo WEB_E2E_OK. Then reply with the single word DONE and stop. {{clock}}"
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -16,6 +16,11 @@
   - img
   - img
   - text: Think The user wants me to run a simple bash command and reply with "DONE".
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
 - img
 - text: Bash Echo the test string
 - button "Think The command executed successfully and output \"WEB_E2E_OK\". I just need to reply with \"DONE\".":
@@ -23,7 +28,11 @@
   - img
   - text: Think The command executed successfully and output "WEB_E2E_OK". I just need to reply with "DONE".
 - paragraph: DONE
-- text: cache hit 99% · 15,818 tokens · 1 turns · 2 steps
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 99% · 15,818 tokens · 1 turns · 2 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tests/snapshots/lifecycle-chrome/reloaded.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: Reply with the single word LIGHTHOUSE and stop.
+- text: Reply with the single word LIGHTHOUSE and stop. {{clock}}
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -17,7 +17,11 @@
   - img
   - text: Think The user wants me to reply with a single word. Let me comply.
 - paragraph: LIGHTHOUSE
-- text: cache hit 99% · 7,810 tokens · 1 turns · 1 steps
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 99% · 7,810 tokens · 1 turns · 1 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tests/snapshots/live-interactions/cancel.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: Reply with a one-sentence description of event sourcing, then stop.
+- text: Reply with a one-sentence description of event sourcing, then stop. {{clock}}
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -13,7 +13,12 @@
 - button "编辑":
   - img
 - paragraph: partial
-- text: 已停止 0 tokens · 1 turns · 1 steps
+- text: 已停止
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} 0 tokens · 1 turns · 1 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tests/snapshots/live-interactions/error-auth.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: Reply with a one-sentence description of event sourcing, then stop.
+- text: Reply with a one-sentence description of event sourcing, then stop. {{clock}}
 - button "复制":
   - img
 - button "在新对话中分支":

apps/web/tests/snapshots/live-interactions/retry.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: Reply with a one-sentence description of event sourcing, then stop.
+- text: Reply with a one-sentence description of event sourcing, then stop. {{clock}}
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -17,7 +17,11 @@
   - img
   - text: Think The user is asking for a one-sentence description of event sourcing. This is a straightforward knowledge question that doesn't require any skill loading or tool calls.
 - paragraph: Event sourcing is a pattern where all changes to an application's state are stored as an immutable, append-only sequence of events, rather than persisting only the current state, enabling full auditability, temporal queries, and event-driven architectures.
-- text: cache hit 99% · 7,869 tokens · 1 turns · 1 steps
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 99% · 7,869 tokens · 1 turns · 1 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tests/snapshots/message-actions/ui.expected.md

@@ -0,0 +1,52 @@
+- banner:
+  - navigation "Session hierarchy":
+    - button "Use the read tool twice" [disabled]
+  - tablist:
+    - tab "Chat" [selected]
+    - tab "Trajectory"
+    - tab "Waterfall"
+- text: "Use the read tool twice in one assistant message: read a.txt and b.txt. Then reply with the single word DONE and stop. {{clock}}"
+- button "复制":
+  - img
+- tooltip "复制"
+- button "在新对话中分支":
+  - img
+- button "编辑":
+  - img
+- button "Think The user wants me to read a.txt and b.txt, then reply with \"DONE\". Let me do both reads in parallel.":
+  - img
+  - img
+  - text: Think The user wants me to read a.txt and b.txt, then reply with "DONE". Let me do both reads in parallel.
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
+- img
+- text: Read
+- button "a.txt"
+- img
+- text: Read
+- button "b.txt"
+- button "Think Both files have been read. a.txt contains \"alpha\" and b.txt contains \"beta\". I'll now reply with DONE as instructed.":
+  - img
+  - img
+  - text: Think Both files have been read. a.txt contains "alpha" and b.txt contains "beta". I'll now reply with DONE as instructed.
+- paragraph: DONE
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 98% · 15,962 tokens · 1 turns · 2 steps
+- textbox "Message the agent"
+- button "Add attachment":
+  - img
+- text: Danger Full Access
+- combobox "Access mode":
+  - option "Read Only"
+  - option "Workspace Write"
+  - option "Danger Full Access" [selected]
+- button "选择模型，当前 deepseek-v4-flash":
+  - text: deepseek-v4-flash
+  - img
+- button "Send message" [disabled]

apps/web/tests/snapshots/seeded-history/ui.expected.md

@@ -1,32 +1,50 @@
 - banner:
   - navigation "Session hierarchy":
     - button "Use the read tool twice" [disabled]
-    - text: · 1 turns
   - tablist:
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: "Use the read tool twice in one assistant message: read a.txt and b.txt. Then reply with the single word DONE and stop."
+- text: "Use the read tool twice in one assistant message: read a.txt and b.txt. Then reply with the single word DONE and stop. {{clock}}"
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- button "编辑":
+  - img
 - button "Think The user wants me to read a.txt and b.txt, then reply with \"DONE\". Let me do both reads in parallel.":
+  - img
   - img
   - text: Think The user wants me to read a.txt and b.txt, then reply with "DONE". Let me do both reads in parallel.
-- button:
+- button "复制":
   - img
-- text: Read a.txt
-- button:
+- button "在新对话中分支":
   - img
-- text: Read b.txt
+- text: {{clock}}
+- img
+- text: Read
+- button "a.txt"
+- img
+- text: Read
+- button "b.txt"
 - button "Think Both files have been read. a.txt contains \"alpha\" and b.txt contains \"beta\". I'll now reply with DONE as instructed.":
+  - img
   - img
   - text: Think Both files have been read. a.txt contains "alpha" and b.txt contains "beta". I'll now reply with DONE as instructed.
 - paragraph: DONE
-- text: cache hit 98% · 15,962 tokens · 1 turns · 2 steps
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 98% · 15,962 tokens · 1 turns · 2 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img
+- text: Danger Full Access
 - combobox "Access mode":
-  - option "Read-only" [selected]
-  - option "Read-write"
+  - option "Read Only"
+  - option "Workspace Write"
+  - option "Danger Full Access" [selected]
 - button "选择模型，当前 deepseek-v4-flash":
   - text: deepseek-v4-flash
   - img

apps/web/tests/snapshots/steering/mid-steer.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: Use the ask_user_question tool to ask me exactly one question with id "checkpoint", question "Ready to continue?", header "Checkpoint", and options labeled "Yes" and "No". After I answer, reply with one short sentence acknowledging my answer and stop.
+- text: Use the ask_user_question tool to ask me exactly one question with id "checkpoint", question "Ready to continue?", header "Checkpoint", and options labeled "Yes" and "No". After I answer, reply with one short sentence acknowledging my answer and stop. {{clock}}
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -16,12 +16,15 @@
   - img
   - img
   - text: Think The user wants me to use the ask_user_question tool to ask them a specific question with the given parameters. Let me do exactly that.
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
 - button:
   - img
   - img
-- text: "Tool call ask_user_question · {\"questions\": [{\"id\": \"checkpoint\", \"question\": \"Ready to continue?\", \"header\": \"Checkpoint\", \"options\": [{\"label\": \"Yes\"}, {\"label\": \"No\"}]}]} 等待回答（1 题）"
-- button "▸ 问题内容"
-- text: cache hit 98% · 7,946 tokens · 1 turns · 1 steps
+- text: "Tool call ask_user_question · {\"questions\": [{\"id\": \"checkpoint\", \"question\": \"Ready to continue?\", \"header\": \"Checkpoint\", \"options\": [{\"label\": \"Yes\"}, {\"label\": \"No\"}]}]} cache hit 98% · 7,946 tokens · 1 turns · 1 steps"
 - region "Ready to continue?":
   - text: Checkpoint
   - heading "Ready to continue?" [level=2]

apps/web/tests/snapshots/steering/settled.expected.md

@@ -5,7 +5,7 @@
     - tab "Chat" [selected]
     - tab "Trajectory"
     - tab "Waterfall"
-- text: Use the ask_user_question tool to ask me exactly one question with id "checkpoint", question "Ready to continue?", header "Checkpoint", and options labeled "Yes" and "No". After I answer, reply with one short sentence acknowledging my answer and stop.
+- text: Use the ask_user_question tool to ask me exactly one question with id "checkpoint", question "Ready to continue?", header "Checkpoint", and options labeled "Yes" and "No". After I answer, reply with one short sentence acknowledging my answer and stop. {{clock}}
 - button "复制":
   - img
 - button "在新对话中分支":
@@ -16,6 +16,11 @@
   - img
   - img
   - text: Think The user wants me to use the ask_user_question tool to ask them a specific question with the given parameters. Let me do exactly that.
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}}
 - button:
   - img
   - img
@@ -25,7 +30,11 @@
   - img
   - text: Think The user selected "Yes" and wants me to include the word "BANANA" in my final reply. Let me acknowledge their answer.
 - paragraph: Great, let's move forward. BANANA!
-- text: cache hit 98% · 15,967 tokens · 1 turns · 2 steps
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- text: {{clock}} cache hit 98% · 15,967 tokens · 1 turns · 2 steps
 - textbox "Message the agent"
 - button "Add attachment":
   - img

apps/web/tsconfig.json

@@ -35,7 +35,8 @@
     "tests/seeded-history.e2e.ts",
     "tests/sidebar-scrollbar.e2e.ts",
     "tests/code-mode-round.e2e.ts",
-    "tests/cordis-tool-round.e2e.ts"
+    "tests/cordis-tool-round.e2e.ts",
+    "tests/message-actions.e2e.ts"
   ],
   "references": [
     {

packages/client/ui-conversation/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-conversation/README.md
-README.md: b68b2ee0b816d0a4ffb440f05592a21772392b77
-README.zh.md: 06a324830e1900b02765853f4c31c53b44657dca
+README.md: e2148cfca658196540e3800912dccd0568ae8d0e
+README.zh.md: 45f05ce2e03e015701e85f2853a4a656511058a9

packages/client/ui-conversation/README.md

@@ -34,7 +34,7 @@ None; this package neither assembles nor sends a provider request.
 
 - **The stats line has no duration segment** — assistant `usage` carries token accounting only; elapsed-time needs a host data source.
 - **Details panel is the minimal form** — selected call args/result raw display; the Input/Output/Metadata switch, Prev/Next stepping, and See-in-trajectory deep link are deferred.
-- **Assistant footer extensions (IconActions row, per-message paging) are reserved slots** — drawn in the design, not implemented.
+- **Assistant per-message paging is a reserved slot** — drawn in the design, not implemented. The finalized IconActions row (copy / branch / clock) ships; branch remains a chrome stub.
 - **The sparkle icon for the others tool row is a hand-drawn approximation** — the design glyph's vector geometry is not exportable locally; promotion into ui-primitives waits on an exact export.
 - **The approval panel's "Always allow this type" is deferred** — durable grants need a grant-storage design; only allow-once/reject answer today.
 - **TodoPanel truncates long item text to one ellipsized line** — the figma strip has no wrap or expand affordance; full text is not readable inline.

packages/client/ui-conversation/README.zh.md

@@ -34,7 +34,7 @@ todo 两个面就是在该形状上的两个注册项，都是普通注册方插
 
 - **统计行没有耗时区段**：assistant `usage` 只携带 token 计数；耗时需要主机数据源。
 - **详情面板是最小形态**：以原始形式显示已选择调用的参数／结果；Input/Output/Metadata 切换、Prev/Next 步进与 See-in-trajectory 深链接暂缓实现。
-- **assistant footer 扩展（IconActions 行、逐消息分页）是预留 slot**：设计中已有图稿，尚未实现。
+- **assistant 逐消息分页是预留 slot**：设计中已有图稿，尚未实现。已定稿的 IconActions 行（复制／分支／时钟）已落地；分支仍是 chrome stub。
 - **others 工具行的闪光图标是手绘近似版本**：无法在本地导出设计字形的矢量几何；等到存在精确导出后再将其提升到 ui-primitives。
 - **审批面板的「始终允许此类」暂缓**：持久授权需要授权存储设计；今天只能回答允许一次／拒绝。
 - **TodoPanel 将过长条目截成单行省略号**：figma 条没有换行或展开入口，完整文本无法在行内读完。

packages/client/ui-conversation/src/client/chat/AssistantMarkdown.module.css

@@ -1,14 +1,22 @@
-/* Assistant flow body: full-width narration (figma 16/28), block gap 16. */
+/* Assistant flow body: full-width narration (figma 16/28), block gap 16.
+   IconActions sit below the body with an explicit 16px top margin (figma
+   43:32997) — separate from the body's internal gap so the footer spacing
+   stays fixed when the body is a single block. */
 
 .root {
   display: flex;
   flex-direction: column;
-  gap: 16px;
   font-size: 16px;
   line-height: 28px;
   color: var(--dsw-alias-label-primary);
 }
 
+.body {
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+}
+
 /* Interrupted-turn terminal marker: quiet inline tag, no animation. */
 .stopped {
   align-self: flex-start;
@@ -19,3 +27,18 @@
   font-size: 11px;
   line-height: 18px;
 }
+
+/* Finalized footer offset (figma 43:32997); chrome lives in MessageIconActions. */
+.actions {
+  margin-top: 16px;
+  /* Optical align with 28px icon hit targets that pad 6px past the glyph. */
+  margin-left: -6px;
+}
+
+/* Hover-capable pointers: reveal shared actions on root hover/focus. */
+@media (hover: hover) {
+  .root:hover .actions,
+  .root:focus-within .actions {
+    opacity: 1;
+  }
+}

packages/client/ui-conversation/src/client/chat/AssistantMarkdown.tsx

@@ -4,10 +4,14 @@
 // view groups them into tool rows through its keyed toolview slot (figma
 // step-summary flow). Shared by finalized nodes and the streaming partial;
 // the turn-level loading dots live in the chat view's tail, not here.
+// Finalized nodes append IconActions (copy / branch / clock) once streaming ends.
 
 import { memo } from 'react'
 import type { AssistantBlock } from '@deepseek-ai/dsh-client-runtime/client'
-import { IconThinkOutline14, JsonBlock, MarkdownText } from '@deepseek-ai/dsh-client-ui-primitives'
+import {
+  IconThinkOutline14, JsonBlock, MarkdownText,
+} from '@deepseek-ai/dsh-client-ui-primitives'
+import { MessageIconActions } from './MessageIconActions.tsx'
 import { ToolRow } from './ToolRow.tsx'
 import css from './AssistantMarkdown.module.css'
 
@@ -16,6 +20,8 @@ export interface AssistantMarkdownProps {
   streaming: boolean
   /** Frozen partial of an aborted turn: rendered with a 已停止 marker. */
   interrupted?: boolean | undefined
+  /** Unix epoch ms for the finalized IconActions clock; omitted while streaming. */
+  time?: number | undefined
 }
 
 function firstLine(text: string): string {
@@ -23,6 +29,15 @@ function firstLine(text: string): string {
   return nl === -1 ? text : text.slice(0, nl)
 }
 
+/** Joined text blocks for the copy action (reasoning / tool heads stay out). */
+function copyText(blocks: readonly AssistantBlock[]): string {
+  const parts: string[] = []
+  for (const block of blocks) {
+    if (block.kind === 'text') parts.push(block.text)
+  }
+  return parts.join('')
+}
+
 /** Reasoning block as the Think variant summary row (figma 39:28304). */
 function ThinkRow({ text, running }: { text: string; running: boolean }) {
   return (
@@ -38,7 +53,9 @@ function ThinkRow({ text, running }: { text: string; running: boolean }) {
   )
 }
 
-export const AssistantMarkdown = memo(function AssistantMarkdown({ blocks, streaming, interrupted }: AssistantMarkdownProps) {
+export const AssistantMarkdown = memo(function AssistantMarkdown({
+  blocks, streaming, interrupted, time,
+}: AssistantMarkdownProps) {
   const last = blocks.length - 1
   // Tool-call heads render as tool rows in the chat view's grouping pass, so
   // a node that is only those heads (or empty) would paint an empty root
@@ -47,18 +64,30 @@ export const AssistantMarkdown = memo(function AssistantMarkdown({ blocks, strea
     || interrupted === true
     || blocks.some(block => block.kind !== 'tool-call')
   if (!hasVisible) return null
+  // Footer only after the turn settles with a known event time; streaming omits it.
+  const showActions = !streaming && time !== undefined
   return (
     <div className={css.root} data-streaming={streaming || undefined}>
-      {blocks.map((block, i) => {
-        switch (block.kind) {
-          case 'text': return <MarkdownText key={i} text={block.text} streaming={streaming} />
-          case 'reasoning': return <ThinkRow key={i} text={block.text} running={streaming && i === last} />
-          // Grouped into tool rows by ChatView; hasVisible above skips an empty shell.
-          case 'tool-call': return null
-          default: return <JsonBlock key={i} label="未知内容块" payload={block.block} />
-        }
-      })}
-      {interrupted && <span className={css.stopped}>已停止</span>}
+      <div className={css.body}>
+        {blocks.map((block, i) => {
+          switch (block.kind) {
+            case 'text': return <MarkdownText key={i} text={block.text} streaming={streaming} />
+            case 'reasoning': return <ThinkRow key={i} text={block.text} running={streaming && i === last} />
+            // Grouped into tool rows by ChatView; hasVisible above skips an empty shell.
+            case 'tool-call': return null
+            default: return <JsonBlock key={i} label="未知内容块" payload={block.block} />
+          }
+        })}
+        {interrupted && <span className={css.stopped}>已停止</span>}
+      </div>
+      {showActions && (
+        <MessageIconActions
+          text={copyText(blocks)}
+          time={time}
+          clock="end"
+          className={css.actions}
+        />
+      )}
     </div>
   )
 })

packages/client/ui-conversation/src/client/chat/ChatView.tsx

@@ -330,7 +330,15 @@ export function ChatView({ useSession, useSessions, useStore, renderSlot, sessio
     }
     const node: ConversationNode = item.node
     if (node.kind === 'assistant') {
-      return <AssistantMarkdown key={item.key} blocks={node.blocks} streaming={false} interrupted={node.interrupted} />
+      return (
+        <AssistantMarkdown
+          key={item.key}
+          blocks={node.blocks}
+          streaming={false}
+          interrupted={node.interrupted}
+          time={node.time}
+        />
+      )
     }
     if (node.kind === 'command') {
       return <CommandRow key={item.key} renderSlot={renderSlot} node={node} />

packages/client/ui-conversation/src/client/chat/MessageIconActions.module.css

@@ -0,0 +1,53 @@
+/* Shared message IconActions row (user + assistant). Parent modules own
+   hover-reveal selectors and layout offsets via the composed className. */
+
+.actions {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  height: 28px;
+}
+
+/* Clock before icons (user figma 388:20051) / after (assistant 43:32997). */
+.timeStart {
+  padding-right: 12px;
+  font-size: 14px;
+  line-height: 24px;
+  color: var(--dsw-alias-label-tertiary);
+  white-space: nowrap;
+}
+
+.timeEnd {
+  padding-left: 12px;
+  font-size: 14px;
+  line-height: 24px;
+  color: var(--dsw-alias-label-tertiary);
+  white-space: nowrap;
+}
+
+/* Hover-capable pointers: hide until a parent hover/focus rule reveals. */
+@media (hover: hover) {
+  .actions {
+    opacity: 0;
+    transition: opacity var(--ds-transition-duration) var(--ds-ease-in-out);
+  }
+}
+
+.action {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  padding: 6px;
+  border: none;
+  border-radius: 28px;
+  background: transparent;
+  color: var(--dsw-alias-label-tertiary);
+  cursor: pointer;
+}
+
+.action:hover {
+  background: var(--dsw-alias-interactive-bg-hover);
+  color: var(--dsw-alias-label-secondary);
+}

packages/client/ui-conversation/src/client/chat/MessageIconActions.tsx

@@ -0,0 +1,65 @@
+// Shared IconActions chrome for user and assistant messages: copy / branch
+// live (branch still a stub), date-aware clock, optional edit stub.
+
+import { useCallback } from 'react'
+import {
+  IconBranchOutline16, IconCopyOutline16, IconEditOutline16, Tooltip,
+} from '@deepseek-ai/dsh-client-ui-primitives'
+import { formatMessageClock, writeClipboard } from './message-chrome.ts'
+import { useCalendarDay } from './use-calendar-day.ts'
+import css from './MessageIconActions.module.css'
+
+export interface MessageIconActionsProps {
+  /** Plain text the copy action writes. */
+  text: string
+  /** Unix epoch ms for the clock label. */
+  time: number
+  /** Clock before icons (user) or after (assistant). */
+  clock: 'start' | 'end'
+  /** When true, append the stub edit control (user bubble). */
+  edit?: boolean | undefined
+  /** Parent layout / hover-reveal class composed onto the actions row. */
+  className?: string | undefined
+}
+
+/**
+ * Copy / branch (/ clock) IconActions row shared by user and assistant chrome.
+ * @param props - Copy text, event time, clock side, optional edit, className.
+ * @returns The actions row element.
+ */
+export function MessageIconActions({
+  text, time, clock, edit, className,
+}: MessageIconActionsProps) {
+  const day = useCalendarDay()
+  const onCopy = useCallback(() => {
+    void writeClipboard(text)
+  }, [text])
+  const clockEl = (
+    <span className={clock === 'start' ? css.timeStart : css.timeEnd}>
+      {formatMessageClock(time, day)}
+    </span>
+  )
+  return (
+    <div className={className === undefined ? css.actions : `${css.actions} ${className}`}>
+      {clock === 'start' ? clockEl : null}
+      <Tooltip label="复制" side="bottom">
+        <button type="button" className={css.action} aria-label="复制" onClick={onCopy}>
+          <IconCopyOutline16 />
+        </button>
+      </Tooltip>
+      <Tooltip label="在新对话中分支" side="bottom">
+        <button type="button" className={css.action} aria-label="在新对话中分支">
+          <IconBranchOutline16 />
+        </button>
+      </Tooltip>
+      {edit === true && (
+        <Tooltip label="编辑" side="bottom">
+          <button type="button" className={css.action} aria-label="编辑">
+            <IconEditOutline16 />
+          </button>
+        </Tooltip>
+      )}
+      {clock === 'end' ? clockEl : null}
+    </div>
+  )
+}

packages/client/ui-conversation/src/client/chat/MessageItem.module.css

@@ -20,46 +20,14 @@
   color: var(--dsw-alias-label-primary);
 }
 
-.actions {
-  display: flex;
-  align-items: center;
-  gap: 10px;
-  height: 28px;
-}
-
-/* Hover-capable pointers: hide until the row is hovered/focused. Touch /
-   hover:none keeps actions visible (opacity:0 still hit-tests). */
+/* Hover-capable pointers: reveal shared MessageIconActions on row hover/focus. */
 @media (hover: hover) {
-  .actions {
-    opacity: 0;
-    transition: opacity var(--ds-transition-duration) var(--ds-ease-in-out);
-  }
-
   .userRow:hover .actions,
   .userRow:focus-within .actions {
     opacity: 1;
   }
 }
 
-.action {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  width: 28px;
-  height: 28px;
-  padding: 6px;
-  border: none;
-  border-radius: 28px;
-  background: transparent;
-  color: var(--dsw-alias-label-tertiary);
-  cursor: pointer;
-}
-
-.action:hover {
-  background: var(--dsw-alias-interactive-bg-hover);
-  color: var(--dsw-alias-label-secondary);
-}
-
 .badge {
   display: inline-block;
   margin-bottom: 4px;

packages/client/ui-conversation/src/client/chat/MessageItem.tsx

@@ -1,18 +1,16 @@
 // MessageItem: the four simple node kinds — user bubble (right-aligned, with
-// copy / branch / edit IconActions), steering (badged bubble), context
+// clock + copy / branch / edit IconActions), steering (badged bubble), context
 // injection and unknown-surface JSON rows. Props are frozen node slices off
 // the snapshot cache; memo holds across streaming because unchanged nodes
 // keep their references.
 
-import { memo, useCallback } from 'react'
+import { memo } from 'react'
 import type { ReactNode } from 'react'
 import type {
   ContextMessageNode, SteeringMessageNode, UnknownSurfaceNode, UserMessageNode,
 } from '@deepseek-ai/dsh-client-runtime/client'
-import {
-  IconBranchOutline16, IconCopyOutline16, IconEditOutline16,
-  JsonBlock, MessageText, Tooltip,
-} from '@deepseek-ai/dsh-client-ui-primitives'
+import { JsonBlock, MessageText } from '@deepseek-ai/dsh-client-ui-primitives'
+import { MessageIconActions } from './MessageIconActions.tsx'
 import css from './MessageItem.module.css'
 
 export interface MessageItemProps {
@@ -30,42 +28,6 @@ function contentText(content: readonly unknown[]): { text: string; rest: unknown
   return { text: texts.join(''), rest }
 }
 
-/** Best-effort clipboard write; rejections stay swallowed (no success chrome). */
-async function writeClipboard(text: string): Promise<void> {
-  // lib.dom types clipboard non-optional, but insecure contexts omit it —
-  // that runtime gap is exactly what this guard detects.
-  /* eslint-disable-next-line @typescript-eslint/no-unnecessary-condition */
-  if (navigator.clipboard?.writeText) {
-    try {
-      await navigator.clipboard.writeText(text)
-    } catch {
-      // Denied permissions / iframe policy.
-    }
-    return
-  }
-  // execCommand('copy') is the only clipboard fallback where the async API
-  // is missing (insecure contexts); deprecated but deliberately retained.
-  /* eslint-disable @typescript-eslint/no-deprecated */
-  const exec = typeof document.execCommand === 'function'
-    ? document.execCommand.bind(document)
-    : undefined
-  if (exec === undefined) return
-  const el = document.createElement('textarea')
-  el.value = text
-  el.setAttribute('readonly', '')
-  el.style.position = 'fixed'
-  el.style.left = '-9999px'
-  document.body.appendChild(el)
-  el.select()
-  try {
-    exec('copy')
-  } catch {
-    // Clipboard unavailable; the button stays idle.
-  }
-  /* eslint-enable @typescript-eslint/no-deprecated */
-  el.remove()
-}
-
 /**
  * Display projection of reference forms in a user bubble (free geometry — no
  * textarea alignment constraint here); everything else stays plain text. The
@@ -98,32 +60,6 @@ function projectUserText(text: string): ReactNode {
   return <>{parts}</>
 }
 
-/** User-bubble IconActions (figma 659:38820): copy is live; branch/edit are chrome stubs. */
-function UserActions({ text }: { text: string }) {
-  const onCopy = useCallback(() => {
-    void writeClipboard(text)
-  }, [text])
-  return (
-    <div className={css.actions}>
-      <Tooltip label="复制" side="bottom">
-        <button type="button" className={css.action} aria-label="复制" onClick={onCopy}>
-          <IconCopyOutline16 />
-        </button>
-      </Tooltip>
-      <Tooltip label="在新对话中分支" side="bottom">
-        <button type="button" className={css.action} aria-label="在新对话中分支">
-          <IconBranchOutline16 />
-        </button>
-      </Tooltip>
-      <Tooltip label="编辑" side="bottom">
-        <button type="button" className={css.action} aria-label="编辑">
-          <IconEditOutline16 />
-        </button>
-      </Tooltip>
-    </div>
-  )
-}
-
 export const MessageItem = memo(function MessageItem({ node }: MessageItemProps) {
   switch (node.kind) {
     case 'user': {
@@ -134,7 +70,13 @@ export const MessageItem = memo(function MessageItem({ node }: MessageItemProps)
             {projectUserText(text)}
             {rest.map((block, i) => <JsonBlock key={i} label="附加内容块" payload={block} />)}
           </div>
-          <UserActions text={text} />
+          <MessageIconActions
+            text={text}
+            time={node.time}
+            clock="start"
+            edit
+            className={css.actions}
+          />
         </div>
       )
     }

packages/client/ui-conversation/src/client/chat/message-chrome.ts

@@ -0,0 +1,91 @@
+// Shared chrome helpers for user/assistant IconActions rows: clipboard write
+// and the compact date+clock label from a session-event epoch.
+
+/**
+ * Best-effort clipboard write; rejections stay swallowed (no success chrome).
+ * @param text - Plain text to place on the clipboard.
+ */
+export async function writeClipboard(text: string): Promise<void> {
+  // lib.dom types clipboard non-optional, but insecure contexts omit it —
+  // that runtime gap is exactly what this guard detects.
+  /* eslint-disable-next-line @typescript-eslint/no-unnecessary-condition */
+  if (navigator.clipboard?.writeText) {
+    try {
+      await navigator.clipboard.writeText(text)
+    } catch {
+      // Denied permissions / iframe policy.
+    }
+    return
+  }
+  // execCommand('copy') is the only clipboard fallback where the async API
+  // is missing (insecure contexts); deprecated but deliberately retained.
+  /* eslint-disable @typescript-eslint/no-deprecated */
+  const exec = typeof document.execCommand === 'function'
+    ? document.execCommand.bind(document)
+    : undefined
+  if (exec === undefined) return
+  const el = document.createElement('textarea')
+  el.value = text
+  el.setAttribute('readonly', '')
+  el.style.position = 'fixed'
+  el.style.left = '-9999px'
+  document.body.appendChild(el)
+  el.select()
+  try {
+    exec('copy')
+  } catch {
+    // Clipboard unavailable; the button stays idle.
+  }
+  /* eslint-enable @typescript-eslint/no-deprecated */
+  el.remove()
+}
+
+function pad2(n: number): string {
+  return String(n).padStart(2, '0')
+}
+
+/**
+ * Local calendar-day epoch (ms at local midnight) for an instant.
+ * @param ms - Unix epoch ms.
+ * @returns Midnight of that local calendar day.
+ */
+export function startOfLocalDay(ms: number): number {
+  const d = new Date(ms)
+  d.setHours(0, 0, 0, 0)
+  return d.getTime()
+}
+
+/**
+ * Delay until the next local midnight after `ms` (at least 1ms).
+ * @param ms - Unix epoch ms.
+ * @returns Milliseconds until the following local midnight.
+ */
+export function msUntilNextLocalMidnight(ms: number): number {
+  const next = new Date(ms)
+  next.setHours(24, 0, 0, 0)
+  return Math.max(next.getTime() - ms, 1)
+}
+
+/**
+ * Compact local timestamp for message IconActions.
+ * Same calendar day → `HH:mm`; earlier this year → `M月D日 HH:mm`;
+ * other years → `YYYY年M月D日 HH:mm`.
+ * @param time - Unix epoch ms from the source session event.
+ * @param now - Reference instant for the day/year cut (defaults to wall clock).
+ * @returns Date-aware clock string (24-hour, zero-padded time).
+ */
+export function formatMessageClock(time: number, now: number = Date.now()): string {
+  const d = new Date(time)
+  const n = new Date(now)
+  const clock = `${pad2(d.getHours())}:${pad2(d.getMinutes())}`
+  if (
+    d.getFullYear() === n.getFullYear()
+    && d.getMonth() === n.getMonth()
+    && d.getDate() === n.getDate()
+  ) {
+    return clock
+  }
+  const md = `${d.getMonth() + 1}月${d.getDate()}日`
+  if (d.getFullYear() === n.getFullYear()) return `${md} ${clock}`
+  return `${d.getFullYear()}年${md} ${clock}`
+}

packages/client/ui-conversation/src/client/chat/use-calendar-day.ts

@@ -0,0 +1,25 @@
+// Component-local calendar-day tick: memoized message rows keep stable props
+// across midnight, so the IconActions clock needs a local day seat that
+// re-fires at the next local midnight without reaching for framework hooks.
+
+import { useEffect, useState } from 'react'
+import { msUntilNextLocalMidnight, startOfLocalDay } from './message-chrome.ts'
+
+/**
+ * Local calendar-day epoch that advances at each local midnight.
+ * @returns Midnight ms for the current local day; updates after the boundary.
+ */
+export function useCalendarDay(): number {
+  const [day, setDay] = useState(() => startOfLocalDay(Date.now()))
+  useEffect(() => {
+    let timer: ReturnType<typeof setTimeout>
+    const arm = (): void => {
+      const now = Date.now()
+      setDay(startOfLocalDay(now))
+      timer = setTimeout(arm, msUntilNextLocalMidnight(now))
+    }
+    timer = setTimeout(arm, msUntilNextLocalMidnight(Date.now()))
+    return () => { clearTimeout(timer) }
+  }, [])
+  return day
+}

packages/client/ui-conversation/tests/chat-branch-tails.spec.tsx

@@ -5,9 +5,12 @@
 // with the keyed-slot machinery specs since the tool ring dissolved into
 // renderSlot.)
 
-import { afterEach, describe, expect, it, vi } from 'vitest'
-import { cleanup, fireEvent, render, screen } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { act, cleanup, fireEvent, render, screen } from '@testing-library/react'
 import { bindSnapshotSelector } from '@deepseek-ai/dsh-client-web-react'
+import {
+  formatMessageClock, msUntilNextLocalMidnight, startOfLocalDay,
+} from '../src/client/chat/message-chrome.ts'
 import { MessageItem } from '../src/client/chat/MessageItem.tsx'
 import { AssistantMarkdown } from '../src/client/chat/AssistantMarkdown.tsx'
 import { StatsLine, type StatsLineProps } from '../src/client/chat/StatsLine.tsx'
@@ -15,19 +18,24 @@ import { StatsLine, type StatsLineProps } from '../src/client/chat/StatsLine.tsx
 afterEach(cleanup)
 
 describe('MessageItem arms', () => {
-  it('user bubbles expose copy / branch / edit actions; copy writes the text', () => {
+  it('user bubbles expose clock / copy / branch / edit; copy writes the text', () => {
     const writeText = vi.fn().mockResolvedValue(undefined)
     Object.defineProperty(navigator, 'clipboard', {
       configurable: true,
       value: { writeText },
     })
+    // Same-day clock: construct "today at 14:24" so the label stays `HH:mm`.
+    const now = new Date()
+    const time = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 14, 24).getTime()
     render(
       <MessageItem node={{
-        kind: 'user', seq: 1,
+        kind: 'user', seq: 1, time,
         content: [{ type: 'text', text: 'hello bubble' }] as never,
-      } as never}
+        source: null,
+      }}
       />,
     )
+    expect(screen.getByText('14:24')).toBeTruthy()
     expect(screen.getByRole('button', { name: '复制' })).toBeTruthy()
     expect(screen.getByRole('button', { name: '在新对话中分支' })).toBeTruthy()
     expect(screen.getByRole('button', { name: '编辑' })).toBeTruthy()
@@ -47,9 +55,10 @@ describe('MessageItem arms', () => {
     })
     render(
       <MessageItem node={{
-        kind: 'user', seq: 1,
+        kind: 'user', seq: 1, time: 1_000,
         content: [{ type: 'text', text: 'fallback body' }] as never,
-      } as never}
+        source: null,
+      }}
       />,
     )
     fireEvent.click(screen.getByRole('button', { name: '复制' }))
@@ -69,9 +78,10 @@ describe('MessageItem arms', () => {
     })
     render(
       <MessageItem node={{
-        kind: 'user', seq: 1,
+        kind: 'user', seq: 1, time: 1_000,
         content: [{ type: 'text', text: 'quiet' }] as never,
-      } as never}
+        source: null,
+      }}
       />,
     )
     fireEvent.click(screen.getByRole('button', { name: '复制' }))
@@ -109,6 +119,56 @@ describe('MessageItem arms', () => {
   })
 })
 
+describe('formatMessageClock', () => {
+  const now = new Date(2026, 6, 29, 10, 0).getTime()
+
+  it('keeps HH:mm on the same calendar day', () => {
+    expect(formatMessageClock(new Date(2026, 6, 29, 14, 24).getTime(), now)).toBe('14:24')
+  })
+
+  it('prefixes month and day across days in the same year', () => {
+    expect(formatMessageClock(new Date(2026, 0, 1, 14, 24).getTime(), now)).toBe('1月1日 14:24')
+  })
+
+  it('prefixes year, month, and day across years', () => {
+    expect(formatMessageClock(new Date(2025, 11, 31, 9, 5).getTime(), now)).toBe('2025年12月31日 09:05')
+  })
+
+  it('arms the next local midnight from an in-day instant', () => {
+    const noon = new Date(2026, 6, 29, 12, 0).getTime()
+    expect(startOfLocalDay(noon)).toBe(new Date(2026, 6, 29).getTime())
+    expect(msUntilNextLocalMidnight(noon)).toBe(12 * 3_600_000)
+  })
+})
+
+describe('useCalendarDay boundary refresh', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+  })
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('widens a same-day user clock after local midnight', () => {
+    const dayStart = new Date(2026, 6, 29, 23, 50).getTime()
+    vi.setSystemTime(dayStart)
+    const time = new Date(2026, 6, 29, 14, 24).getTime()
+    render(
+      <MessageItem node={{
+        kind: 'user', seq: 1, time,
+        content: [{ type: 'text', text: 'night bubble' }] as never,
+        source: null,
+      }}
+      />,
+    )
+    expect(screen.getByText('14:24')).toBeTruthy()
+    act(() => {
+      vi.advanceTimersByTime(msUntilNextLocalMidnight(dayStart) + 1)
+    })
+    expect(screen.getByText('7月29日 14:24')).toBeTruthy()
+  })
+})
+
 describe('small branch tails', () => {
   it('AssistantMarkdown single-line reasoning summary skips the newline cut', () => {
     const view = render(
@@ -117,6 +177,35 @@ describe('small branch tails', () => {
     expect(view.getByText('one-liner')).toBeTruthy()
   })
 
+  it('finalized assistant messages expose copy / branch / clock after the body; streaming omits them', () => {
+    const writeText = vi.fn().mockResolvedValue(undefined)
+    Object.defineProperty(navigator, 'clipboard', {
+      configurable: true,
+      value: { writeText },
+    })
+    const now = new Date()
+    const time = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 14, 24).getTime()
+    const settled = render(
+      <AssistantMarkdown
+        blocks={[{ kind: 'text', text: 'answer body' }, { kind: 'reasoning', text: 'hidden' }]}
+        streaming={false}
+        time={time}
+      />,
+    )
+    expect(settled.getByText('14:24')).toBeTruthy()
+    expect(settled.getByRole('button', { name: '复制' })).toBeTruthy()
+    expect(settled.getByRole('button', { name: '在新对话中分支' })).toBeTruthy()
+    fireEvent.click(settled.getByRole('button', { name: '复制' }))
+    expect(writeText).toHaveBeenCalledWith('answer body')
+    settled.unmount()
+
+    const streaming = render(
+      <AssistantMarkdown blocks={[{ kind: 'text', text: 'partial' }]} streaming time={time} />,
+    )
+    expect(streaming.queryByRole('button', { name: '复制' })).toBeNull()
+    expect(streaming.queryByText('14:24')).toBeNull()
+  })
+
   it('StatsLine omits the cache-hit segment when no input accounting exists at all', () => {
     // cacheHitPct is null only when input+cacheRead are both zero (pure
     // output accounting) — any input makes it a real 0%.

packages/host/apiproxy/src/api/sessions.schema.ts

@@ -211,4 +211,3 @@ export const sessionCancelRequestSchema = z.object({
 export const sessionCancelValueSchema = z.object({
   accepted: z.literal(true),
 }) satisfies z.ZodType<Wire<ResponseValue<'session.cancel'>>>
-

tsconfig.host.json

@@ -23,6 +23,7 @@
     "apps/web/tests/sidebar-scrollbar.e2e.ts",
     "apps/web/tests/code-mode-round.e2e.ts",
     "apps/web/tests/cordis-tool-round.e2e.ts",
+    "apps/web/tests/message-actions.e2e.ts",
     "apps/cli/tests/**/*.ts",
     "examples/*/src/**/*.ts",
     "examples/*/start.ts",