diff --git a/apps/web/tests/navigation-panes.e2e.ts b/apps/web/tests/navigation-panes.e2e.ts
index a4abc5cecd..311122780b 100644
--- a/apps/web/tests/navigation-panes.e2e.ts
+++ b/apps/web/tests/navigation-panes.e2e.ts
@@ -127,21 +127,18 @@ describe('web e2e: navigation & panes over a rich seeded session', () => {
   it.skipIf(MODE === 'record')('renders the trajectory ledger and opens its local record inspector', async () => {
     onTestFailed(() => saveFailureShot(page, 'web-e2e-navigation-trajectory'))
     await page.getByRole('tab', { name: 'Trajectory' }).click()
-    // Thick row rules mark the two turns; compact inline markers identify
-    // each step without introducing dedicated group rows.
+    // Turn rules partition the ledger without restoring a separate header row.
     await expect.poll(() => page.locator('tr[data-turn-start="true"]').count(), { timeout: 15_000 }).toBe(2)
-    await expect.poll(() => page.locator('[aria-label^="Step "]').count(), { timeout: 10_000 }).toBe(3)
-    await expect.poll(() => page.getByRole('columnheader', { name: 'Tokens' }).count(), { timeout: 10_000 }).toBe(0)
-    await expect.poll(() => page.getByRole('columnheader', { name: '耗时' }).count(), { timeout: 10_000 }).toBe(0)
+    await expect.poll(() => page.getByRole('columnheader').count(), { timeout: 10_000 }).toBe(0)
     await page.locator('tr[data-kind="tool"]').first().click()
-    await expect.poll(() => page.getByRole('complementary', { name: '记录详情' }).count(), { timeout: 10_000 }).toBe(1)
-    await page.getByRole('tab', { name: '输出' }).click()
+    await expect.poll(() => page.getByRole('complementary', { name: 'Event details' }).count(), { timeout: 10_000 }).toBe(1)
+    await page.getByRole('tab', { name: 'Result' }).click()
     await expect.poll(() => page.getByText('NAVIGATION_OK', { exact: false }).count(), { timeout: 10_000 }).toBeGreaterThanOrEqual(1)
     const snapshot = (await captureStableAria(page, '[class*="viewArea"]', scaffold.workspaceCwd))
       .split(SEED_ID).join('{{seededId}}')
     await compareOrRefreshGolden(TRAJECTORY_EXPECTED, snapshot, MODE)
-    await page.getByRole('complementary', { name: '记录详情' })
-      .getByRole('button', { name: '关闭详情' }).click()
+    await page.getByRole('complementary', { name: 'Event details' })
+      .getByRole('button', { name: 'Close details' }).click()
   }, 60_000)
 
   it.skipIf(MODE === 'record')('renders the waterfall tab with span stats and one lane per span', async () => {
diff --git a/apps/web/tests/snapshots/navigation-panes/details-open.expected.md b/apps/web/tests/snapshots/navigation-panes/details-open.expected.md
index d69a95eb2d..f93afb4c50 100644
--- a/apps/web/tests/snapshots/navigation-panes/details-open.expected.md
+++ b/apps/web/tests/snapshots/navigation-panes/details-open.expected.md
@@ -1,5 +1,6 @@
 - text: bash
 - button "关闭详情"
-- text: Input
+- text: Input json
+- button "复制"
 - code: "{ \"command\": \"echo NAVIGATION_OK\", \"description\": \"Print NAVIGATION_OK\" }"
 - text: Output NAVIGATION_OK
diff --git a/apps/web/tests/snapshots/navigation-panes/trajectory.expected.md b/apps/web/tests/snapshots/navigation-panes/trajectory.expected.md
index 4224bce857..94a7690d48 100644
--- a/apps/web/tests/snapshots/navigation-panes/trajectory.expected.md
+++ b/apps/web/tests/snapshots/navigation-panes/trajectory.expected.md
@@ -1,57 +1,50 @@
-- toolbar "轨迹工具栏":
-  - text: 轨迹
-  - strong: "8"
-  - text: 条记录
-  - strong: "2"
-  - text: 轮
-  - strong: "3"
-  - text: 次工具
-  - button "收起记录"
+- toolbar "Trajectory toolbar":
+  - text: Trajectory
+  - button "Collapse calls"
+  - button "Collapse turns"
 - table:
   - rowgroup:
-    - row "# 事件 内容":
-      - columnheader "#"
-      - columnheader "事件"
-      - columnheader "内容"
-  - rowgroup:
-    - 'row "记录 1，USER，NavScenario: first run bash to print exactly NAVIGATION_OK, then read nav-a.md and nav-b.md using two read calls in ONE assistant message, then reply with the single word FIRST_DONE and stop."':
-      - cell "#1"
-      - cell "USER"
+    - row "SYSTEM, Initial System Prompt":
+      - cell "SYSTEM"
+      - cell "Initial System Prompt"
+    - 'row "USER, NavScenario: first run bash to print exactly NAVIGATION_OK, then read nav-a.md and nav-b.md using two read calls in ONE assistant message, then reply with the single word FIRST_DONE and stop."':
+      - cell "Turn 1 USER"
       - 'cell "NavScenario: first run bash to print exactly NAVIGATION_OK, then read nav-a.md and nav-b.md using two read calls in ONE assistant message, then reply with the single word FIRST_DONE and stop."'
-    - row "记录 2，ASSISTANT，请求调用 bash、read×2":
-      - cell "#2"
-      - cell "Step 1 ASSISTANT": S1 ASSISTANT
-      - cell "请求调用 bash、read×2"
-    - 'row "记录 3，TOOL，bash · {\"command\": \"echo NAVIGATION_OK\", \"description\": \"Print NAVIGATION_OK\"}" [selected]':
-      - cell "#3"
+    - 'row "Request 1, ASSISTANT, The user wants me to follow a specific navigation scenario. Let me: Run bash to print \"NAVIGATION_OK\" Read nav-a.md and nav-b.md in two read calls in ONE message Reply with \"FIRST_DONE\" Let me start with the bash command and the reads."':
+      - 'cell "Request #1 ASSISTANT"':
+        - 'button "Request #1"'
+        - text: ASSISTANT
+      - 'cell "The user wants me to follow a specific navigation scenario. Let me: Run bash to print \"NAVIGATION_OK\" Read nav-a.md and nav-b.md in two read calls in ONE message Reply with \"FIRST_DONE\" Let me start with the bash command and the reads."'
+    - 'row "TOOL, bash {\"command\": \"echo NAVIGATION_OK\", \"description\": \"Print NAVIGATION_OK\"}" [selected]':
       - cell "TOOL"
-      - 'cell "bash · {\"command\": \"echo NAVIGATION_OK\", \"description\": \"Print NAVIGATION_OK\"}→NAVIGATION_OK"'
-    - 'row "记录 4，TOOL，read · {\"file_path\": \"nav-a.md\"}"':
-      - cell "#4"
+      - 'cell "bash{\"command\": \"echo NAVIGATION_OK\", \"description\": \"Print NAVIGATION_OK\"} → NAVIGATION_OK"'
+    - 'row "TOOL, read {\"file_path\": \"nav-a.md\"}"':
       - cell "TOOL"
-      - 'cell "read · {\"file_path\": \"nav-a.md\"}→<path>{{cwd}}/nav-a.md</path> <type>file</type> <content> 1: # alpha nav (End of file - total 1 lines) </content>"'
-    - 'row "记录 5，TOOL，read · {\"file_path\": \"nav-b.md\"}"':
-      - cell "#5"
+      - 'cell "read{\"file_path\": \"nav-a.md\"} → <path>{{cwd}}/nav-a.md</path> <type>file</type> <content> 1: # alpha nav (End of file - total 1 lines) </content>"'
+    - 'row "TOOL, read {\"file_path\": \"nav-b.md\"}"':
       - cell "TOOL"
-      - 'cell "read · {\"file_path\": \"nav-b.md\"}→<path>{{cwd}}/nav-b.md</path> <type>file</type> <content> 1: # beta nav (End of file - total 1 lines) </content>"'
-    - row "记录 6，ASSISTANT，FIRST_DONE":
-      - cell "#6"
-      - cell "Step 2 ASSISTANT": S2 ASSISTANT
+      - 'cell "read{\"file_path\": \"nav-b.md\"} → <path>{{cwd}}/nav-b.md</path> <type>file</type> <content> 1: # beta nav (End of file - total 1 lines) </content>"'
+    - row "Request 2, ASSISTANT, FIRST_DONE":
+      - 'cell "Request #2 ASSISTANT"':
+        - 'button "Request #2"'
+        - text: ASSISTANT
       - cell "FIRST_DONE"
-    - 'row "记录 7，USER，Reply in markdown with: a level-2 heading \"Navigation Summary\", a bulleted list of exactly two items, and a fenced code block containing echo WATERFALL. Then stop."':
-      - cell "#7"
-      - cell "USER"
+    - 'row "USER, Reply in markdown with: a level-2 heading \"Navigation Summary\", a bulleted list of exactly two items, and a fenced code block containing echo WATERFALL. Then stop."':
+      - cell "Turn 2 USER"
       - 'cell "Reply in markdown with: a level-2 heading \"Navigation Summary\", a bulleted list of exactly two items, and a fenced code block containing echo WATERFALL. Then stop."'
-    - 'row "记录 8，ASSISTANT，## Navigation Summary - alpha nav - beta nav ``` echo WATERFALL ```"':
-      - cell "#8"
-      - cell "Step 1 ASSISTANT": S1 ASSISTANT
-      - 'cell "## Navigation Summary - alpha nav - beta nav ``` echo WATERFALL ```"'
-- complementary "记录详情":
-  - text: "TOOL 记录 #3 Turn 1 · Step 1"
-  - button "关闭详情"
-  - tablist "记录详情":
-    - tab "概览"
-    - tab "输入"
-    - tab "输出" [selected]
-    - tab "计时"
-  - tabpanel "输出": NAVIGATION_OK
+    - row "Request 3, ASSISTANT, Navigation Summary alpha nav beta nav echo WATERFALL":
+      - 'cell "Request #3 ASSISTANT"':
+        - 'button "Request #3"'
+        - text: ASSISTANT
+      - cell "Navigation Summary alpha nav beta nav echo WATERFALL"
+- complementary "Event details":
+  - separator "Resize event details"
+  - text: TOOL Turn 1 · Step 1
+  - button "Close details"
+  - tablist "Event details":
+    - tab "Summary"
+    - tab "Payload"
+    - tab "Result" [selected]
+    - tab "Schema"
+    - tab "Timing"
+  - tabpanel "Result": NAVIGATION_OK
diff --git a/packages/client/runtime/src/client/sessions/fold-adapter.ts b/packages/client/runtime/src/client/sessions/fold-adapter.ts
index 752ba4155c..d96cc2c16c 100644
--- a/packages/client/runtime/src/client/sessions/fold-adapter.ts
+++ b/packages/client/runtime/src/client/sessions/fold-adapter.ts
@@ -58,7 +58,6 @@ function materializeNode(
       return {
         kind: 'user', seq: event.seq, time: event.time,
         content: event.data.content, source: event.data.source,
-        meta: event.data.meta,
       }
     case 'assistant/message':
       return {
@@ -76,7 +75,6 @@ function materializeNode(
       return {
         kind: 'steering', seq: event.seq, time: event.time, turn: event.data.turn,
         content: event.data.content, source: event.data.source,
-        meta: event.data.meta,
       }
     case 'tool/result': {
       const call = callIndex.get(String(event.data.callId))
diff --git a/packages/client/runtime/src/client/sessions/session.ts b/packages/client/runtime/src/client/sessions/session.ts
index cc79727f69..5006aa0447 100644
--- a/packages/client/runtime/src/client/sessions/session.ts
+++ b/packages/client/runtime/src/client/sessions/session.ts
@@ -955,7 +955,7 @@ function deriveModelRequests(events: readonly SessionEvent[]): readonly ModelReq
       const key = modelRequestKey(sourceEvent.data.turn, sourceEvent.data.step)
       const index = byStep.get(key)
       const request = index === undefined ? undefined : requests[index]
-      if (request !== undefined && request.status === 'running') {
+      if (index !== undefined && request !== undefined && request.status === 'running') {
         requests[index] = {
           ...request,
           completedAt: sourceEvent.time,
diff --git a/packages/client/ui-conversation/tests/skeleton.spec.tsx b/packages/client/ui-conversation/tests/skeleton.spec.tsx
index b777c85ac3..f0c5288b00 100644
--- a/packages/client/ui-conversation/tests/skeleton.spec.tsx
+++ b/packages/client/ui-conversation/tests/skeleton.spec.tsx
@@ -88,6 +88,7 @@ function mount(
     if (key === 'conversation.session') {
       return (
         <ConversationSession
+          composer={null}
           sessionId={SID}
           SessionProvider={({ children }) => children(SID)}
           useSession={useSession}
diff --git a/packages/client/ui-primitives/src/JsonTree.tsx b/packages/client/ui-primitives/src/JsonTree.tsx
index c3ce0aeda5..bad1b4b4c9 100644
--- a/packages/client/ui-primitives/src/JsonTree.tsx
+++ b/packages/client/ui-primitives/src/JsonTree.tsx
@@ -72,7 +72,10 @@ function previewPrimitive(value: unknown): ReactNode {
   if (typeof value === 'symbol') {
     return <span className={css.otherValue}>{value.description ?? 'Symbol'}</span>
   }
-  return <span className={css.otherValue}>{value.name || 'Function'}</span>
+  if (typeof value === 'function') {
+    return <span className={css.otherValue}>{value.name || 'Function'}</span>
+  }
+  return null
 }
 
 function previewValue(value: unknown, depth: number): ReactNode {
diff --git a/packages/client/ui-trajectory/src/client/TrajectoryTable.tsx b/packages/client/ui-trajectory/src/client/TrajectoryTable.tsx
index 17ce682b0e..5751471ae5 100644
--- a/packages/client/ui-trajectory/src/client/TrajectoryTable.tsx
+++ b/packages/client/ui-trajectory/src/client/TrajectoryTable.tsx
@@ -1147,7 +1147,7 @@ function RequestTiming({
 }: {
   assistant: TableRecord | undefined
   anchor: TableRecord | undefined
-  request?: TrajectoryRequestNumber
+  request: TrajectoryRequestNumber | undefined
 }) {
   if (assistant !== undefined) return <RecordTiming record={assistant} />
   if (request?.startedAt !== undefined) {
@@ -1746,8 +1746,9 @@ export function TrajectoryTable({
             onPointerDown={(event) => {
               if (event.button !== 0) return
               const details = event.currentTarget.parentElement
-              const split = details?.parentElement
-              if (details === null || split === null) return
+              if (details === null) return
+              const split = details.parentElement
+              if (split === null) return
               const splitWidth = split.getBoundingClientRect().width
               detailsResizeDrag.current = {
                 pointerId: event.pointerId,
@@ -1785,8 +1786,9 @@ export function TrajectoryTable({
             onKeyDown={(event) => {
               if (event.key !== 'ArrowLeft' && event.key !== 'ArrowRight') return
               const details = event.currentTarget.parentElement
-              const split = details?.parentElement
-              if (details === null || split === null) return
+              if (details === null) return
+              const split = details.parentElement
+              if (split === null) return
               const direction = event.key === 'ArrowLeft' ? 1 : -1
               const currentDetailsWidth = details.getBoundingClientRect().width
               const splitWidth = split.getBoundingClientRect().width
diff --git a/packages/client/ui-trajectory/src/client/layout.ts b/packages/client/ui-trajectory/src/client/layout.ts
index eb996f05ed..d6b0ec0edc 100644
--- a/packages/client/ui-trajectory/src/client/layout.ts
+++ b/packages/client/ui-trajectory/src/client/layout.ts
@@ -331,7 +331,6 @@ export function deriveTrajectoryLayout(input: TrajectoryLayoutInput): readonly T
           text: summarizeContent(node.content),
           sourceSeq: node.seq,
           messageSource: node.source,
-          ...(node.meta === undefined ? {} : { messageMeta: node.meta }),
           inputDetail: detailContent(node.content),
           sourceBlocks: node.content.map(block => sourceBlock(block)),
           timeSeconds: 0,
diff --git a/packages/client/ui-trajectory/tests/views.spec.tsx b/packages/client/ui-trajectory/tests/views.spec.tsx
index be64f5c79f..e51356c854 100644
--- a/packages/client/ui-trajectory/tests/views.spec.tsx
+++ b/packages/client/ui-trajectory/tests/views.spec.tsx
@@ -130,6 +130,7 @@ function mount(slots: SlotsService, nodes: ConversationSnapshot['nodes'] = NODES
   }) as unknown as ConversationSessionProps['renderSlot']
   return render(
     <ConversationSession
+      composer={null}
       sessionId={SID}
       SessionProvider={({ children }) => children(SID)}
       useSession={useSession}
diff --git a/tsconfig.client.json b/tsconfig.client.json
index 9f67ab4af7..dd43357d92 100644
--- a/tsconfig.client.json
+++ b/tsconfig.client.json
@@ -20,6 +20,7 @@
     "packages/client/*/tests/**/*.ts",
     "packages/client/*/tests/**/*.tsx",
     "packages/client/tsdown.client.ts",
+    "scripts/client-bundle-css.spec.ts",
     "scripts/client-bundle-purity.spec.ts"
   ],
   "references": [
diff --git a/tsconfig.host.json b/tsconfig.host.json
index 9cf2a86bda..cf10b76791 100644
--- a/tsconfig.host.json
+++ b/tsconfig.host.json
@@ -32,6 +32,7 @@
   ],
   "exclude": [
     "packages/client/**",
+    "scripts/client-bundle-css.spec.ts",
     "scripts/client-bundle-purity.spec.ts"
   ],
   "references": [