style(desktop): bring the install & update overlays onto the design system

Align the first-launch install overlay and the in-app update overlay to
apps/desktop/DESIGN.md, reusing in-bundle primitives only (no new deps):

- install overlay: Loader2 spinners -> Loader (fourier-flow); emerald check /
  AlertTriangle -> neutral Codicon check + canonical ErrorIcon; de-boxed the
  failure block; hairline (--stroke-nous) command/code chips; --ui-* tokens;
  BrandMark header; flat stage rows (only the active step opaque).
- update overlay: drop the redundant DialogContent border (base Dialog already
  supplies shadow-nous + --stroke-nous); de-box the changelog; hairline +
  primary-flash manual command block; on-brand BrandMark for "all set".

apps/desktop/src/app/updates-overlay.tsx

@@ -10,7 +10,7 @@ import { Loader } from '@/components/ui/loader'
 import type { DesktopUpdateCommit, DesktopUpdateStage, DesktopUpdateStatus } from '@/global'
 import { useI18n } from '@/i18n'
 import { buildCommitChangelog, type CommitGroup } from '@/lib/commit-changelog'
-import { AlertCircle, Check, CheckCircle2, Copy, Terminal } from '@/lib/icons'
+import { AlertCircle, Check, Copy, Terminal } from '@/lib/icons'
 import { resolveUpdateCopy, type UpdateTarget } from '@/lib/update-copy'
 import { cn } from '@/lib/utils'
 import {
@@ -94,10 +94,7 @@ export function UpdatesOverlay() {
 
   return (
     <Dialog onOpenChange={handleClose} open={open}>
-      <DialogContent
-        className="max-w-sm overflow-hidden border-border/70 p-0 gap-0"
-        showCloseButton={phase !== 'applying'}
-      >
+      <DialogContent className="max-w-sm overflow-hidden p-0 gap-0" showCloseButton={phase !== 'applying'}>
         {phase === 'applying' && <ApplyingView apply={apply} isBackend={isBackend} />}
 
         {phase === 'manual' && (
@@ -204,7 +201,7 @@ function IdleView({
     return (
       <CenteredStatus
         body={target === 'backend' ? u.latestBodyBackend : u.latestBody}
-        icon={<CheckCircle2 className="size-7 text-emerald-600 dark:text-emerald-400" />}
+        icon={<BrandMark className="size-12" />}
         title={u.allSetTitle}
       />
     )
@@ -229,7 +226,7 @@ function IdleView({
         <DialogDescription className="text-center text-sm">{body}</DialogDescription>
       </div>
 
-      <div className="grid gap-3 rounded-xl border border-border/70 bg-muted/20 px-4 py-3">
+      <div className="grid gap-3">
         {groups.map(group => (
           <div key={group.id}>
             <p className="text-[0.625rem] font-semibold uppercase tracking-wide text-muted-foreground">{group.label}</p>
@@ -304,26 +301,25 @@ function ManualView({ command, message, onDone }: { command: string | null; mess
       </div>
 
       <button
-        className="group flex w-full items-center justify-between gap-3 rounded-xl border border-border/70 bg-muted/30 px-4 py-3 text-left transition-colors hover:border-border hover:bg-muted/50"
+        className={cn(
+          'group flex w-full items-center justify-between gap-3 rounded-md border px-4 py-3 text-left transition-colors',
+          copied ? 'border-primary/50' : 'border-(--stroke-nous) hover:border-(--ui-stroke-secondary)'
+        )}
         onClick={handleCopy}
         type="button"
       >
-        <code className="select-all font-mono text-sm text-foreground">
-          <span className="text-muted-foreground">$ </span>
+        <code className="min-w-0 flex-1 truncate select-all font-mono text-sm text-foreground">
+          <span className="select-none text-muted-foreground">$ </span>
           {command}
         </code>
-        <span className="flex shrink-0 items-center gap-1 text-xs font-medium text-muted-foreground transition-colors group-hover:text-foreground">
-          {copied ? (
-            <>
-              <Check className="size-3.5 text-emerald-600 dark:text-emerald-400" />
-              {u.copied}
-            </>
-          ) : (
-            <>
-              <Copy className="size-3.5" />
-              {u.copy}
-            </>
+        <span
+          className={cn(
+            'flex shrink-0 items-center gap-1 text-xs font-medium transition-colors',
+            copied ? 'text-primary' : 'text-muted-foreground group-hover:text-foreground'
           )}
+        >
+          {copied ? <Check className="size-3.5" /> : <Copy className="size-3.5" />}
+          {copied ? u.copied : u.copy}
         </span>
       </button>
 

apps/desktop/src/components/desktop-install-overlay.tsx

@@ -1,6 +1,9 @@
 import { useEffect, useMemo, useRef, useState } from 'react'
 
+import { BrandMark } from '@/components/brand-mark'
 import { Button } from '@/components/ui/button'
+import { Codicon } from '@/components/ui/codicon'
+import { ErrorIcon } from '@/components/ui/error-state'
 import { Loader } from '@/components/ui/loader'
 import { LogView } from '@/components/ui/log-view'
 import type {
@@ -11,7 +14,7 @@ import type {
   DesktopBootstrapState
 } from '@/global'
 import { useI18n } from '@/i18n'
-import { AlertTriangle, Check, ChevronDown, ChevronRight, iconSize, Loader2 } from '@/lib/icons'
+import { ChevronDown, ChevronRight, iconSize } from '@/lib/icons'
 import { cn } from '@/lib/utils'
 
 /**
@@ -48,7 +51,6 @@ interface DesktopInstallOverlayProps {
 interface StageRowProps {
   descriptor: DesktopBootstrapStageDescriptor
   result: DesktopBootstrapStageResult | undefined
-  isCurrent: boolean
   now: number
 }
 
@@ -98,7 +100,7 @@ function formatElapsed(ms: number): string {
   return `${m}:${String(s - m * 60).padStart(2, '0')}`
 }
 
-function StageRow({ descriptor, result, isCurrent, now }: StageRowProps) {
+function StageRow({ descriptor, result, now }: StageRowProps) {
   const { t } = useI18n()
   const copy = t.install
   const state: DesktopBootstrapStageState = result?.state || 'pending'
@@ -109,52 +111,48 @@ function StageRow({ descriptor, result, isCurrent, now }: StageRowProps) {
   const icon = useMemo(() => {
     switch (state) {
       case 'running':
-        return <Loader2 className={cn(iconSize.md, 'animate-spin text-primary')} />
+        return <Loader className="size-6" type="fourier-flow" />
 
       case 'succeeded':
-        return <Check className={cn(iconSize.md, 'text-emerald-600')} />
 
       case 'skipped':
-        return <Check className={cn(iconSize.md, 'text-muted-foreground')} />
+        return <Codicon className="text-muted-foreground" name="check" size="0.8125rem" />
 
       case 'failed':
-        return <AlertTriangle className={cn(iconSize.md, 'text-destructive')} />
+        return <ErrorIcon size="1rem" />
 
       case 'pending':
 
       default:
-        return <div className="h-2 w-2 rounded-full border border-muted-foreground/40" />
+        return <div className="size-1.5 rounded-full border border-(--ui-stroke-secondary)" />
     }
   }, [state])
 
   const reason = result?.json?.reason || result?.error || null
 
   return (
-    <li
-      className={cn(
-        'flex items-start gap-3 rounded-md px-3 py-2 transition-colors',
-        isCurrent && 'bg-muted/60',
-        state === 'failed' && 'bg-destructive/10'
+    <li className="flex items-center gap-3 px-3 py-1">
+      {state === 'running' && (
+        <div className="-mr-2 -ml-4 flex size-6 flex-shrink-0 items-center justify-center">{icon}</div>
       )}
-    >
-      <div className="flex h-5 w-5 flex-shrink-0 items-center justify-center">{icon}</div>
       <div className="min-w-0 flex-1">
-        <div className="flex items-baseline justify-between gap-2">
-          <span className={cn('truncate text-sm font-medium', state === 'pending' && 'text-muted-foreground')}>
+        <div className="flex items-center gap-1.5">
+          <span className={cn('truncate text-sm', state === 'running' ? 'font-medium' : 'text-muted-foreground')}>
             {formatStageName(descriptor.name)}
           </span>
-          <span className="flex-shrink-0 text-xs tabular-nums text-muted-foreground">
-            {state === 'running'
-              ? elapsed
-                ? `${copy.stageStates[state]} · ${elapsed}`
-                : copy.stageStates[state]
-              : null}
-            {state === 'succeeded' || state === 'skipped' ? formatDuration(result?.durationMs) : null}
-            {state === 'failed' ? copy.stageStates[state] : null}
-          </span>
+          {state !== 'running' && <span className="flex size-4 shrink-0 items-center justify-center">{icon}</span>}
         </div>
         {reason && state !== 'pending' && <p className="mt-0.5 truncate text-xs text-muted-foreground">{reason}</p>}
       </div>
+      <span className="flex-shrink-0 text-xs tabular-nums text-muted-foreground">
+        {state === 'running'
+          ? elapsed
+            ? `${copy.stageStates[state]} · ${elapsed}`
+            : copy.stageStates[state]
+          : null}
+        {state === 'succeeded' || state === 'skipped' ? formatDuration(result?.durationMs) : null}
+        {state === 'failed' ? copy.stageStates[state] : null}
+      </span>
     </li>
   )
 }
@@ -245,6 +243,7 @@ function applyEvent(state: DesktopBootstrapState, ev: DesktopBootstrapEvent): De
 export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayProps) {
   const { t } = useI18n()
   const copy = t.install
+
   const [state, setState] = useState<DesktopBootstrapState>(EMPTY_STATE)
   const [logOpen, setLogOpen] = useState(false)
   const [copied, setCopied] = useState(false)
@@ -353,12 +352,12 @@ export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayP
     return (
       <div className="fixed inset-0 z-[1400] flex items-center justify-center bg-background/90 backdrop-blur-md">
         <div className="w-full max-w-xl rounded-xl border border-(--stroke-nous) bg-card p-8 shadow-nous">
-          <h2 className="text-2xl font-semibold tracking-tight">{copy.oneTimeTitle}</h2>
+          <h2 className="text-xl font-semibold tracking-tight">{copy.oneTimeTitle}</h2>
           <p className="mt-2 text-sm text-muted-foreground">{copy.unsupportedDesc(platformLabel)}</p>
 
           <div className="mt-4">
             <div className="mb-1.5 text-xs font-medium text-muted-foreground">{copy.installCommand}</div>
-            <pre className="overflow-x-auto rounded-md border bg-muted/50 px-3 py-2.5 font-mono text-[12px]">
+            <pre className="overflow-x-auto rounded-md border border-(--stroke-nous) px-3 py-2.5 font-mono text-[12px]">
               <code>{ups.installCommand}</code>
             </pre>
             <div className="mt-2 flex items-center gap-2">
@@ -383,9 +382,9 @@ export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayP
             </div>
           </div>
 
-          <div className="mt-6 flex items-center justify-between border-t pt-4">
+          <div className="mt-6 flex items-center justify-between pt-2">
             <span className="text-xs text-muted-foreground">
-              {copy.installTo} <code className="rounded bg-muted/50 px-1 py-0.5 font-mono">{ups.activeRoot}</code>
+              {copy.installTo} <code className="font-mono text-(--ui-text-secondary)">{ups.activeRoot}</code>
             </span>
             <Button onClick={() => window.location.reload()} size="sm" variant="default">
               {copy.retryAfterRun}
@@ -417,11 +416,14 @@ export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayP
     <div className="fixed inset-0 z-[1400] flex items-center justify-center bg-background/90 backdrop-blur-md p-4">
       <div className="flex w-full max-w-2xl max-h-[90vh] flex-col rounded-xl border border-(--stroke-nous) bg-card shadow-nous">
         {/* Header -- always visible, never scrolls */}
-        <div className="flex-shrink-0 p-8 pb-4">
-          <h2 className="text-2xl font-semibold tracking-tight">
-            {failed ? copy.failedTitle : state.active ? copy.settingUpTitle : copy.finishingTitle}
-          </h2>
-          <p className="mt-1.5 text-sm text-muted-foreground">{failed ? copy.failedDesc : copy.activeDesc}</p>
+        <div className="flex flex-shrink-0 items-start gap-4 p-8 pb-4">
+          {!failed && <BrandMark className="size-11 shrink-0" />}
+          <div className="min-w-0">
+            <h2 className="text-xl font-semibold tracking-tight">
+              {failed ? copy.failedTitle : state.active ? copy.settingUpTitle : copy.finishingTitle}
+            </h2>
+            <p className="mt-1.5 text-sm text-muted-foreground">{failed ? copy.failedDesc : copy.activeDesc}</p>
+          </div>
         </div>
 
         {/* Scrollable middle: progress, stages, error block, log */}
@@ -436,7 +438,7 @@ export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayP
                 </span>
                 <span className="tabular-nums">{progressPct}%</span>
               </div>
-              <div className="h-1.5 w-full overflow-hidden rounded-full bg-muted">
+              <div className="h-1.5 w-full overflow-hidden rounded-full bg-(--ui-bg-tertiary)">
                 <div
                   className={cn('h-full transition-all duration-300', failed ? 'bg-destructive' : 'bg-primary')}
                   style={{ width: `${progressPct}%` }}
@@ -447,31 +449,25 @@ export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayP
 
           {totalCount === 0 && state.active && (
             <div className="mb-4 flex items-center gap-2.5 text-sm text-muted-foreground">
-              <Loader className="size-5" type="lemniscate-bloom" />
+              <Loader className="size-5" type="fourier-flow" />
               <span>{copy.fetchingManifest}</span>
             </div>
           )}
 
           {failed && state.error && (
-            <div className="mb-4 rounded-md border border-destructive/30 bg-destructive/10 p-3 text-sm">
-              <div className="mb-1 flex items-center gap-1.5 font-medium text-destructive">
-                <AlertTriangle className={iconSize.md} />
-                <span>{copy.error}</span>
+            <div className="mb-4 flex items-start gap-2 text-sm">
+              <ErrorIcon className="mt-0.5 shrink-0" size="1rem" />
+              <div className="min-w-0">
+                <div className="font-medium text-destructive">{copy.error}</div>
+                <p className="mt-0.5 whitespace-pre-wrap break-words text-foreground/90">{state.error}</p>
               </div>
-              <p className="whitespace-pre-wrap break-words text-foreground/90">{state.error}</p>
             </div>
           )}
 
           {stages.length > 0 && (
-            <ol className="mb-4 space-y-1">
+            <ol className="mb-4 space-y-0.5">
               {stages.map(stage => (
-                <StageRow
-                  descriptor={stage}
-                  isCurrent={stage.name === currentStage}
-                  key={stage.name}
-                  now={now}
-                  result={state.stages[stage.name]}
-                />
+                <StageRow descriptor={stage} key={stage.name} now={now} result={state.stages[stage.name]} />
               ))}
             </ol>
           )}
@@ -527,7 +523,7 @@ export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayP
                 size="sm"
                 variant="ghost"
               >
-                {cancelling ? <Loader2 className={cn(iconSize.md, 'animate-spin')} /> : null}
+                {cancelling ? <Loader className="size-4" type="fourier-flow" /> : null}
                 {cancelling ? copy.cancelling : copy.cancelInstall}
               </Button>
             </div>
@@ -540,7 +536,7 @@ export function DesktopInstallOverlay({ enabled = true }: DesktopInstallOverlayP
             <div className="flex items-center justify-between gap-2">
               <span className="text-xs text-muted-foreground">
                 {copy.transcriptSaved}{' '}
-                <code className="rounded bg-muted/50 px-1 py-0.5 font-mono">%LOCALAPPDATA%\hermes\logs\</code>
+                <code className="font-mono text-(--ui-text-secondary)">%LOCALAPPDATA%\hermes\logs\</code>
               </span>
               <div className="flex gap-2">
                 <Button

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

@@ -294,10 +294,10 @@ const LOADER_CURVES: Record<LoaderType, LoaderCurve> = {
   },
   'fourier-flow': {
     ...baseCurve('Fourier Flow', {
-      durationMs: 8400,
+      durationMs: 2200,
       particleCount: 92,
-      pulseDurationMs: 6800,
-      rotationDurationMs: 44000,
+      pulseDurationMs: 2000,
+      rotationDurationMs: 15000,
       strokeWidth: 4.2,
       trailSpan: 0.31
     }),