refactor(desktop): hoist shared ToggleRow into settings primitives

System + Notifications each had an identical local ToggleRow; lift one
haptic-baked version into primitives and reuse it. Net -12 lines.

apps/desktop/src/app/settings/notifications-settings.tsx

@@ -3,7 +3,6 @@ import type { ReactNode } from 'react'
 
 import { Button } from '@/components/ui/button'
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
-import { Switch } from '@/components/ui/switch'
 import { useI18n } from '@/i18n'
 import { COMPLETION_SOUND_VARIANTS, previewCompletionSound } from '@/lib/completion-sound'
 import { triggerHaptic } from '@/lib/haptics'
@@ -20,7 +19,7 @@ import {
 import { notify } from '@/store/notifications'
 
 import { CONTROL_TEXT } from './constants'
-import { ListRow, SectionHeading, SettingsContent } from './primitives'
+import { ListRow, SectionHeading, SettingsContent, ToggleRow } from './primitives'
 
 const CAPTION = 'text-[length:var(--conversation-caption-font-size)] text-(--ui-text-tertiary)'
 
@@ -28,32 +27,6 @@ function Caption({ children, className }: { children: ReactNode; className?: str
   return <p className={cn(CAPTION, className)}>{children}</p>
 }
 
-function ToggleRow(props: {
-  checked: boolean
-  description: string
-  disabled?: boolean
-  label: string
-  onChange: (on: boolean) => void
-}) {
-  return (
-    <ListRow
-      action={
-        <Switch
-          aria-label={props.label}
-          checked={props.checked}
-          disabled={props.disabled}
-          onCheckedChange={on => {
-            triggerHaptic('selection')
-            props.onChange(on)
-          }}
-        />
-      }
-      description={props.description}
-      title={props.label}
-    />
-  )
-}
-
 export function NotificationsSettings() {
   const { t } = useI18n()
   const prefs = useStore($nativeNotifyPrefs)

apps/desktop/src/app/settings/primitives.tsx

@@ -3,6 +3,8 @@ import type { ReactNode } from 'react'
 import { PageLoader } from '@/components/page-loader'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
+import { Switch } from '@/components/ui/switch'
+import { triggerHaptic } from '@/lib/haptics'
 import type { IconComponent } from '@/lib/icons'
 import { cn } from '@/lib/utils'
 
@@ -108,6 +110,39 @@ export function ListRow({
   )
 }
 
+// A labelled on/off row — the canonical device-pref switch (haptic baked in).
+export function ToggleRow({
+  checked,
+  description,
+  disabled,
+  label,
+  onChange
+}: {
+  checked: boolean
+  description?: string
+  disabled?: boolean
+  label: string
+  onChange: (on: boolean) => void
+}) {
+  return (
+    <ListRow
+      action={
+        <Switch
+          aria-label={label}
+          checked={checked}
+          disabled={disabled}
+          onCheckedChange={on => {
+            triggerHaptic('selection')
+            onChange(on)
+          }}
+        />
+      }
+      description={description}
+      title={label}
+    />
+  )
+}
+
 export function LoadingState({ label }: { label: string }) {
   return <PageLoader label={label} />
 }

apps/desktop/src/app/settings/system-settings.tsx

@@ -1,7 +1,6 @@
 import { useStore } from '@nanostores/react'
 
 import { SegmentedControl } from '@/components/ui/segmented-control'
-import { Switch } from '@/components/ui/switch'
 import { useI18n } from '@/i18n'
 import { triggerHaptic } from '@/lib/haptics'
 import { Cpu } from '@/lib/icons'
@@ -10,7 +9,7 @@ import { $keepAwake, setKeepAwake } from '@/store/keep-awake'
 import { $translucency, setTranslucency } from '@/store/translucency'
 import { $zoomPercent, setZoomPercent } from '@/store/zoom'
 
-import { ListRow, SectionHeading, SettingsContent } from './primitives'
+import { ListRow, SectionHeading, SettingsContent, ToggleRow } from './primitives'
 
 // UI scale presets as zoom percentages (100 = browser default); the ids double
 // as the percent sent to main. A Cmd/Ctrl +/- step between presets highlights
@@ -19,25 +18,6 @@ const UI_SCALE_PRESETS = ['90', '100', '110', '125', '150', '175'] as const
 
 type UiScalePreset = (typeof UI_SCALE_PRESETS)[number]
 
-function ToggleRow(props: { checked: boolean; description: string; label: string; onChange: (on: boolean) => void }) {
-  return (
-    <ListRow
-      action={
-        <Switch
-          aria-label={props.label}
-          checked={props.checked}
-          onCheckedChange={on => {
-            triggerHaptic('selection')
-            props.onChange(on)
-          }}
-        />
-      }
-      description={props.description}
-      title={props.label}
-    />
-  )
-}
-
 export function SystemSettings() {
   const { t } = useI18n()
   const s = t.settings.system