refactor(desktop): export DialogCloseButton for the boot-failure overlay

The overlay carried a byte-for-byte copy of DialogContent's close button.

apps/desktop/src/components/boot-failure-overlay.tsx

@@ -3,6 +3,7 @@ import { Dialog as DialogPrimitive } from 'radix-ui'
 import { type ComponentProps, lazy, type ReactNode, Suspense, useEffect, useState } from 'react'
 
 import { Button } from '@/components/ui/button'
+import { DialogCloseButton } from '@/components/ui/dialog'
 import { DialogPortalContainerContext } from '@/components/ui/dialog-portal-context'
 import { ErrorIcon } from '@/components/ui/error-state'
 import { Loader } from '@/components/ui/loader'
@@ -12,17 +13,7 @@ import { useI18n } from '@/i18n'
 import { reestablishCloudAgentSession } from '@/lib/cloud-agent-session'
 import { DESKTOP_DOCS_URL } from '@/lib/docs'
 import { openExternalLink } from '@/lib/external-link'
-import {
-  ChevronLeft,
-  ExternalLink,
-  FileText,
-  Loader2,
-  LogIn,
-  RefreshCw,
-  SlidersHorizontal,
-  Wrench,
-  X
-} from '@/lib/icons'
+import { ChevronLeft, ExternalLink, FileText, Loader2, LogIn, RefreshCw, SlidersHorizontal, Wrench } from '@/lib/icons'
 import { $desktopBoot } from '@/store/boot'
 import { notify, notifyError } from '@/store/notifications'
 import { $desktopOnboarding } from '@/store/onboarding'
@@ -54,25 +45,6 @@ type RecoveryView = 'connect' | 'recovery'
 // re-establish the remote session. The detection + copy helpers live in
 // ./boot-failure-reauth so they're unit-testable without a React render.
 
-// Radix Close routes through the modal's onOpenChange, same path as Escape.
-function DismissControl() {
-  const { t } = useI18n()
-
-  return (
-    <DialogPrimitive.Close asChild data-slot="dialog-close-button">
-      <Button
-        aria-label={t.common.close}
-        className="absolute right-2.5 top-2.5 z-20 text-(--ui-text-tertiary) hover:bg-(--chrome-action-hover) hover:text-foreground"
-        size="icon-xs"
-        variant="ghost"
-      >
-        <X className="size-4" />
-        <span className="sr-only">{t.common.close}</span>
-      </Button>
-    </DialogPrimitive.Close>
-  )
-}
-
 // Recovery surface for a hard boot failure (gateway never came up, backend
 // exited during startup, bootstrap latched, …). Without this the app shell
 // renders dead — "gateway offline", no composer, only a toast — with no way
@@ -504,7 +476,7 @@ export function BootFailureOverlay() {
     return (
       <BootFailureModal onDismiss={dismiss} title={copy.gatewaySettings}>
         <div className="relative flex max-h-[86vh] w-full max-w-[46rem] flex-col overflow-hidden rounded-xl border border-(--stroke-nous) bg-(--ui-chat-bubble-background) shadow-nous">
-          <DismissControl />
+          <DialogCloseButton />
           {/* Subtle back affordance (projects/overlay idiom): muted → foreground
               on hover, no divider. */}
           <button
@@ -528,7 +500,7 @@ export function BootFailureOverlay() {
   return (
     <BootFailureModal onDismiss={dismiss}>
       <div className="relative w-full max-w-[40rem] overflow-hidden rounded-xl border border-(--stroke-nous) bg-(--ui-chat-bubble-background) shadow-nous">
-        <DismissControl />
+        <DialogCloseButton />
         <div className="flex items-start gap-3 px-5 py-4 pr-12">
           <ErrorIcon className="mt-0.5" size="1.25rem" />
           <div>

apps/desktop/src/components/ui/dialog.tsx

@@ -69,6 +69,27 @@ export function preventCloseButtonAutoFocus(event: Event) {
   event.preventDefault()
 }
 
+// The dialog's top-right X. Radix Close routes through the modal's
+// onOpenChange, same path as Escape. Exported for bespoke Radix shells (the
+// boot-failure overlay) that can't use DialogContent but want the same X.
+function DialogCloseButton() {
+  const { t } = useI18n()
+
+  return (
+    <DialogPrimitive.Close asChild data-slot="dialog-close-button">
+      <Button
+        aria-label={t.common.close}
+        className="absolute right-2.5 top-2.5 z-20 text-(--ui-text-tertiary) hover:bg-(--chrome-action-hover) hover:text-foreground"
+        size="icon-xs"
+        variant="ghost"
+      >
+        <X className="size-4" />
+        <span className="sr-only">{t.common.close}</span>
+      </Button>
+    </DialogPrimitive.Close>
+  )
+}
+
 function DialogContent({
   className,
   bodyClassName,
@@ -105,8 +126,6 @@ function DialogContent({
   banner?: React.ReactNode
   bannerTone?: DialogBannerTone
 }) {
-  const { t } = useI18n()
-
   const widthClass = fitContent ? 'w-auto max-w-[92vw]' : 'w-full max-w-lg'
 
   // Publish the dialog's content node so popovers (Select / Popover /
@@ -133,20 +152,8 @@ function DialogContent({
   // an input) is what most dialogs want. Dialogs with no input should pass
   // `onOpenAutoFocus={preventCloseButtonAutoFocus}` explicitly instead.
 
-  // No tip on the X — the glyph is the label. Keep aria-label / sr-only for a11y.
-  const closeButton = showCloseButton ? (
-    <DialogPrimitive.Close asChild data-slot="dialog-close-button">
-      <Button
-        aria-label={t.common.close}
-        className="absolute right-2.5 top-2.5 z-20 text-(--ui-text-tertiary) hover:bg-(--chrome-action-hover) hover:text-foreground"
-        size="icon-xs"
-        variant="ghost"
-      >
-        <X className="size-4" />
-        <span className="sr-only">{t.common.close}</span>
-      </Button>
-    </DialogPrimitive.Close>
-  ) : null
+  // No tip on the X — the glyph is the label (DialogCloseButton keeps aria-label / sr-only).
+  const closeButton = showCloseButton ? <DialogCloseButton /> : null
 
   // With a banner, the border can't live on the scroll/clip box (it would draw a
   // line around the banner too). The white body keeps its own bottom radius and
@@ -314,6 +321,7 @@ function DialogDescription({ className, ...props }: React.ComponentProps<typeof
 export {
   Dialog,
   DialogClose,
+  DialogCloseButton,
   DialogContent,
   DialogDescription,
   DialogFooter,