fix(chat): localize monitoring status without render churn

src/renderer/src/components/native-chat/NativeChatMonitoringStatus.tsx

@@ -1,6 +1,5 @@
-import { AgentStateDot, agentStateLabel } from '@/components/AgentStateDot'
-
-const MONITORING_LABEL = agentStateLabel('monitoring')
+import { AgentStateDot } from '@/components/AgentStateDot'
+import { translate } from '@/i18n/i18n'
 
 export function NativeChatMonitoringStatus({
   monitoring
@@ -20,7 +19,9 @@ export function NativeChatMonitoringStatus({
       <span aria-hidden="true">
         <AgentStateDot state="monitoring" title={null} />
       </span>
-      <span>{MONITORING_LABEL}</span>
+      <span>
+        {translate('components.native-chat.monitoringStatus.label', 'Monitoring background tasks')}
+      </span>
     </div>
   )
 }

src/renderer/src/components/native-chat/use-native-chat-hook-status.ts

@@ -44,12 +44,11 @@ function resolveNativeChatHookStatus(
 }
 
 export function useNativeChatMonitoringStatus(paneKey: string): boolean {
-  // Why: monitoring stays out of foreground lifecycle while remaining visible from the tab glyph's pane-status source.
-  const agentStatusEpoch = useAppStore((store) => store.agentStatusEpoch)
-  void agentStatusEpoch
-  return useAppStore((store) =>
-    resolveNativeChatMonitoringStatus(store.agentStatusByPaneKey[paneKey])
-  )
+  return useAppStore((store) => {
+    // Why: epoch invalidates freshness; the primitive result avoids unrelated-pane rerenders.
+    void store.agentStatusEpoch
+    return resolveNativeChatMonitoringStatus(store.agentStatusByPaneKey[paneKey])
+  })
 }
 
 export function useNativeChatHookStatus(

src/renderer/src/components/native-chat/use-native-chat-monitoring-status.test.tsx

@@ -0,0 +1,66 @@
+// @vitest-environment happy-dom
+
+import '@testing-library/jest-dom/vitest'
+
+import { act, cleanup, render, screen } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import type { AgentStatusEntry } from '../../../../shared/agent-status-types'
+import { AGENT_STATUS_STALE_AFTER_MS } from '../../../../shared/agent-status-types'
+import { useAppStore } from '@/store'
+import { useNativeChatMonitoringStatus } from './use-native-chat-hook-status'
+
+const PANE_KEY = 'tab-1:11111111-1111-4111-8111-111111111111'
+
+function monitoringEntry(updatedAt: number): AgentStatusEntry {
+  return {
+    paneKey: PANE_KEY,
+    state: 'working',
+    workingMode: 'monitoring',
+    prompt: 'Monitor background tasks',
+    updatedAt,
+    stateStartedAt: updatedAt,
+    stateHistory: []
+  }
+}
+
+describe('useNativeChatMonitoringStatus', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+    vi.setSystemTime(new Date('2026-09-04T12:00:00.000Z'))
+    useAppStore.setState({
+      agentStatusByPaneKey: { [PANE_KEY]: monitoringEntry(Date.now()) },
+      agentStatusEpoch: 0
+    })
+  })
+
+  afterEach(() => {
+    cleanup()
+    useAppStore.setState({ agentStatusByPaneKey: {}, agentStatusEpoch: 0 })
+    vi.useRealTimers()
+  })
+
+  it('rerenders at expiry without rerendering for an unrelated epoch', () => {
+    let renders = 0
+    function Probe(): React.JSX.Element {
+      renders += 1
+      const monitoring = useNativeChatMonitoringStatus(PANE_KEY)
+      return <span>{monitoring ? 'monitoring' : 'idle'}</span>
+    }
+
+    render(<Probe />)
+    expect(screen.getByText('monitoring')).toBeInTheDocument()
+    expect(renders).toBe(1)
+
+    act(() => {
+      useAppStore.setState((state) => ({ agentStatusEpoch: state.agentStatusEpoch + 1 }))
+    })
+    expect(renders).toBe(1)
+
+    vi.setSystemTime(Date.now() + AGENT_STATUS_STALE_AFTER_MS + 1)
+    act(() => {
+      useAppStore.setState((state) => ({ agentStatusEpoch: state.agentStatusEpoch + 1 }))
+    })
+    expect(screen.getByText('idle')).toBeInTheDocument()
+    expect(renders).toBe(2)
+  })
+})

src/renderer/src/i18n/locales/en.json

@@ -17009,7 +17009,10 @@
       },
       "structuredSessionCloseFailed": "Could not close this Codex chat",
       "structuredSessionLaunchFailed": "Could not open Codex chat",
-      "structuredSessionCloseFailedDescription": "The terminal stayed open so the provider remains recoverable."
+      "structuredSessionCloseFailedDescription": "The terminal stayed open so the provider remains recoverable.",
+      "monitoringStatus": {
+        "label": "Monitoring background tasks"
+      }
     },
     "tab": {
       "bar": {