fix(native-chat): let a structured chat tab be renamed

Renaming a native chat tab accepted the text and silently did nothing:
setTabCustomTitle only scanned terminal tabs and only bridged to unified
tabs whose contentType was 'terminal', so the agent-session tab it was
keyed to never matched. Any label that did land was then re-nulled by the
next host snapshot, which preserved color/createdAt/isPinned but not
customLabel.

Also routes both placeholder sites through one helper so a Claude chat
stops falling back to 'Codex Chat'.

pnpm-lock.yaml

@@ -6,6 +6,9 @@ importers:
   .:
     configDependencies: {}
     packageManagerDependencies:
+      '@pnpm/exe':
+        specifier: 12.0.0
+        version: 12.0.0
       pnpm:
         specifier: 12.0.0
         version: 12.0.0
@@ -56,6 +59,11 @@ packages:
     cpu: [x64]
     os: [win32]
 
+  '@pnpm/exe@12.0.0':
+    resolution: {integrity: sha512-405vw2qYPPghNxoPRt2cvkGtGNU5gnInDcIe5TztQxe73yUZLqFJN/jCJFGs1xbVaIWDXEVuQ71P8npFZeatZQ==}
+    engines: {node: '>=18.*'}
+    hasBin: true
+
   pnpm@12.0.0:
     resolution: {integrity: sha512-ni49w5EZlYaNyUuBdcIXwn6VQI+gO0oidJd48rNPdzt3zdOznt6BcbIvzVO+ajU0Lp+smUimjvWN9kiM6Jp+Zw==}
     engines: {node: '>=18.*'}
@@ -87,6 +95,17 @@ snapshots:
   '@pnpm/exe.win32-x64@12.0.0':
     optional: true
 
+  '@pnpm/exe@12.0.0':
+    optionalDependencies:
+      '@pnpm/exe.darwin-arm64': 12.0.0
+      '@pnpm/exe.darwin-x64': 12.0.0
+      '@pnpm/exe.linux-arm64': 12.0.0
+      '@pnpm/exe.linux-arm64-musl': 12.0.0
+      '@pnpm/exe.linux-x64': 12.0.0
+      '@pnpm/exe.linux-x64-musl': 12.0.0
+      '@pnpm/exe.win32-arm64': 12.0.0
+      '@pnpm/exe.win32-x64': 12.0.0
+
   pnpm@12.0.0:
     optionalDependencies:
       '@pnpm/exe.darwin-arm64': 12.0.0

src/main/runtime/orca-runtime-restore-structured-agent-session-tabs-once.ts

@@ -1,4 +1,5 @@
 // @ts-nocheck -- mechanically split from OrcaRuntimeService; behavior is covered by AST equivalence and characterization tests.
+import { defaultAgentChatLabel } from '../../shared/agent-session-chat-label'
 import { OrcaRuntimeWithResolveRecoveredStructuredTuiTranscript } from './orca-runtime-resolve-recovered-structured-tui-transcript'
 import { getStructuredAgentSessionHost } from '../native-chat/agent-session-wire/structured-agent-session-registry'
 import { collectSavedStructuredAgentSessionIds } from './saved-structured-agent-session-restoration'
@@ -105,7 +106,7 @@ export class OrcaRuntimeWithRestoreStructuredAgentSessionTabsOnce extends OrcaRu
     const tab: RuntimeMobileSessionAgentTab = {
       type: 'agent-session',
       id,
-      title: input.agent === 'claude' ? 'Claude Chat' : 'Codex Chat',
+      title: defaultAgentChatLabel(input.agent),
       sessionId: input.sessionId,
       agent: input.agent,
       isActive: input.activate

src/renderer/src/runtime/web-session-tabs-sync/mirrored-agent-tab-label.test.ts

@@ -0,0 +1,65 @@
+import { describe, expect, it } from 'vitest'
+import type { RuntimeMobileSessionTabsResult } from '../../../../shared/runtime-types'
+import type { Tab } from '../../../../shared/tab-types'
+import { buildMirroredAgentTabs } from './terminal-surfaces'
+
+const WORKTREE = 'repo-1::worktree-1'
+const GROUP = 'group-1'
+
+function snapshotWith(agent: 'claude' | 'codex', title: string): RuntimeMobileSessionTabsResult {
+  return {
+    worktree: WORKTREE,
+    publicationEpoch: 'epoch-1',
+    snapshotVersion: 1,
+    activeGroupId: GROUP,
+    activeTabId: null,
+    activeTabType: null,
+    tabs: [
+      {
+        type: 'agent-session',
+        id: 'host-tab-1',
+        title,
+        sessionId: `${agent}-1`,
+        agent,
+        isActive: false
+      }
+    ]
+  } as RuntimeMobileSessionTabsResult
+}
+
+function build(
+  snapshot: RuntimeMobileSessionTabsResult,
+  currentUnifiedTabs: readonly Tab[] = []
+): Tab {
+  const [mirrored] = buildMirroredAgentTabs(
+    snapshot,
+    new Map(),
+    GROUP,
+    0,
+    currentUnifiedTabs,
+    1_000
+  )
+  return mirrored.unifiedTab
+}
+
+describe('buildMirroredAgentTabs', () => {
+  it('falls back to the agent-specific placeholder when the host publishes no title', () => {
+    expect(build(snapshotWith('claude', '')).label).toBe('Claude Chat')
+    expect(build(snapshotWith('codex', '   ')).label).toBe('Codex Chat')
+  })
+
+  it('prefers the host title over the placeholder', () => {
+    expect(build(snapshotWith('claude', 'Flaky retry test')).label).toBe('Flaky retry test')
+  })
+
+  it('keeps a manual rename across host snapshots', () => {
+    const snapshot = snapshotWith('codex', 'Codex Chat')
+    const renamed = build(snapshot)
+    const existing: Tab = { ...renamed, customLabel: 'My rename' }
+    expect(build(snapshot, [existing]).customLabel).toBe('My rename')
+  })
+
+  it('leaves customLabel null when the tab was never renamed', () => {
+    expect(build(snapshotWith('codex', 'Codex Chat')).customLabel).toBeNull()
+  })
+})

src/renderer/src/runtime/web-session-tabs-sync/terminal-surfaces.ts

@@ -3,6 +3,7 @@ import type {
   RuntimeMobileSessionAgentTab
 } from '../../../../shared/runtime-types'
 import type { TerminalLayoutSnapshot, TerminalTab } from '../../../../shared/terminal-tab-types'
+import { defaultAgentChatLabel } from '../../../../shared/agent-session-chat-label'
 import { sanitizeTerminalLayoutPaneTitlesForLabels } from '@/lib/terminal-pane-title-sanitization'
 import { resolveTerminalLayoutRoot } from '../remote-terminal-layout-resolution'
 import { getRemoteRuntimePtyEnvironmentId } from '../runtime-terminal-stream'
@@ -73,8 +74,10 @@ export function buildMirroredAgentTabs(
         worktreeId: snapshot.worktree,
         contentType: 'agent-session',
         agentSessionAgent: tab.agent,
-        label: tab.title.trim() || 'Codex Chat',
-        customLabel: null,
+        label: tab.title.trim() || defaultAgentChatLabel(tab.agent),
+        // Why: a manual rename lives only on the client; re-nulling it here made
+        // every host snapshot silently discard the user's title.
+        customLabel: existing?.customLabel ?? null,
         color: tab.color !== undefined ? tab.color : (existing?.color ?? null),
         sortOrder: sortOffset + index,
         createdAt: existing?.createdAt ?? now + sortOffset + index,

src/renderer/src/store/terminals/terminal-tab-attention.ts

@@ -87,9 +87,12 @@ export function createTerminalTabAttentionActions(
         scheduleRuntimeGraphSync()
         return { tabsByWorktree: next }
       })
-      const item = Object.values(get().unifiedTabsByWorktree)
-        .flat()
-        .find((entry) => entry.contentType === 'terminal' && entry.entityId === tabId)
+      const unified = Object.values(get().unifiedTabsByWorktree).flat()
+      // Why: a structured chat tab has no TerminalTab record, and its rename
+      // arrives keyed by the unified tab id rather than a terminal entityId.
+      const item =
+        unified.find((entry) => entry.contentType === 'terminal' && entry.entityId === tabId) ??
+        unified.find((entry) => entry.contentType === 'agent-session' && entry.id === tabId)
       if (item) {
         get().setTabCustomLabel(item.id, title, opts)
       }

src/shared/agent-session-chat-label.ts

@@ -0,0 +1,4 @@
+/** Placeholder tab label for a structured chat that has no conversation name yet. */
+export function defaultAgentChatLabel(agent: 'claude' | 'codex' | null | undefined): string {
+  return agent === 'claude' ? 'Claude Chat' : 'Codex Chat'
+}