Fix L29/L52: QUALITY_OPTIONS moved to UI module; installer spawn via child_process

L29: QUALITY_OPTIONS was a presentational constant living in store/downloads.ts,
     coupling views to the store. Moved to src/renderer/src/qualityOptions.ts,
     which assembles it directly from @shared/ipc. store/downloads.ts no longer
     imports VIDEO/AUDIO_QUALITY_OPTIONS. Both consumers (DownloadBar, SettingsView)
     updated to import from the new module.

L52: Replaced the fixed `setTimeout(app.quit, 1500)` installer handoff with a
     detached spawn. The installer is spawned with stdio:'ignore' and unref'd so
     it outlives AeroFetch even on a slow machine. app.quit() fires on setImmediate
     so the IPC response returns to the renderer before the process exits.

typecheck + 242 tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CODE-AUDIT.md

@@ -436,7 +436,7 @@ token system + shared primitives (UI/SIMP — high value, larger effort) · i18n
   runs its primary action). Inconsistent.
 - [x] **L28 — Default kind/quality applied once.** DownloadBar seeds from settings via a one-shot
   ref; changing the default in Settings while on the Downloads tab isn't reflected until reload.
-- [ ] **L29 — UI constant in the store.** `QUALITY_OPTIONS` lives in `store/downloads.ts` yet is a
+- [x] **L29 — UI constant in the store.** `QUALITY_OPTIONS` lives in `store/downloads.ts` yet is a
   presentational constant imported by views — couples UI to the store module.
 - [x] **L30 — Redundant `loading="lazy"`** on `MediaThumb` images already inside a virtualized
   list (the virtualizer only mounts visible rows).
@@ -480,7 +480,7 @@ token system + shared primitives (UI/SIMP — high value, larger effort) · i18n
 - [x] **L50 — "Cookies saved" shown for 0 cookies.** Closing the sign-in window without logging in
   still writes the file and reports `ok` with `cookieCount: 0`.
 - [ ] **L51 — Scheduled daily sync time hardcoded to 09:00** (schedule.ts) — on/off toggle only, no time picker.
-- [ ] **L52 — Installer handoff is a fixed `setTimeout(app.quit, 1500)`** (updater.ts) — a race on slow machines.
+- [x] **L52 — Installer handoff is a fixed `setTimeout(app.quit, 1500)`** (updater.ts) — a race on slow machines.
 - [x] **L53 — `dialog.show*Dialog(win!, …)` non-null assertions** on a possibly-null window
   (chooseFolder, backup export/import) — can throw if the sender window is gone.
 - [x] **L54 — DownloadBar preview `<img>` has no `onError` fallback** (inconsistent with `MediaThumb`'s retry).

src/main/updater.ts

@@ -1,4 +1,5 @@
-import { app, net, shell, type WebContents } from 'electron'
+import { app, net, type WebContents } from 'electron'
+import { spawn } from 'child_process'
 import { createWriteStream, type WriteStream } from 'fs'
 import { stat, unlink } from 'fs/promises'
 import { join, normalize, dirname } from 'path'
@@ -413,9 +414,6 @@ export async function downloadAppUpdate(url: string, wc: WebContents): Promise<A
   })
 }
 
-/** Let the launched installer spawn before we quit to release our files (ms). */
-const INSTALLER_HANDOFF_MS = 1500
-
 /** Launch a freshly-downloaded installer, then quit so it can replace the app. */
 export async function runAppUpdate(filePath: string): Promise<{ ok: boolean; error?: string }> {
   try {
@@ -428,10 +426,13 @@ export async function runAppUpdate(filePath: string): Promise<{ ok: boolean; err
       return { ok: false, error: 'Refused to run an unexpected file.' }
     }
     await stat(target) // throws if the file is missing
-    const err = await shell.openPath(target) // hand the installer to the OS
-    if (err) return { ok: false, error: err }
-    // Give the installer a beat to spawn, then quit so it can overwrite our files.
-    setTimeout(() => app.quit(), INSTALLER_HANDOFF_MS)
+    // Spawn the installer detached + unref'd so it outlives our process even on a
+    // slow machine. shell.openPath goes through ShellExecute but gives us no child
+    // PID to wait on; spawning directly lets us call unref() before we quit.
+    const child = spawn(target, [], { detached: true, stdio: 'ignore', shell: false })
+    child.unref()
+    // Let the IPC response reach the renderer before we exit.
+    setImmediate(() => app.quit())
     return { ok: true }
   } catch (e) {
     return { ok: false, error: e instanceof Error ? e.message : String(e) }

src/renderer/src/components/DownloadBar.tsx

@@ -28,7 +28,8 @@ import {
   WarningRegular
 } from '@fluentui/react-icons'
 import type { MediaInfo, FormatOption, PlaylistInfo } from '@shared/ipc'
-import { useDownloads, QUALITY_OPTIONS, type MediaKind } from '../store/downloads'
+import { useDownloads, type MediaKind } from '../store/downloads'
+import { QUALITY_OPTIONS } from '../qualityOptions'
 import { sameVideo } from '../store/queueStats'
 import { useSettings } from '../store/settings'
 import { Select } from './Select'

src/renderer/src/components/SettingsView.tsx

@@ -55,7 +55,8 @@ import {
 } from '@shared/ipc'
 import { useSettings } from '../store/settings'
 import { useSystemTheme } from '../store/systemTheme'
-import { QUALITY_OPTIONS, useDownloads } from '../store/downloads'
+import { useDownloads } from '../store/downloads'
+import { QUALITY_OPTIONS } from '../qualityOptions'
 import { useTemplates } from '../store/templates'
 import { useErrorLog } from '../store/errorlog'
 import { Select } from './Select'

src/renderer/src/qualityOptions.ts

@@ -0,0 +1,6 @@
+import { VIDEO_QUALITY_OPTIONS, AUDIO_QUALITY_OPTIONS } from '@shared/ipc'
+
+export const QUALITY_OPTIONS = {
+  video: VIDEO_QUALITY_OPTIONS,
+  audio: AUDIO_QUALITY_OPTIONS
+} as const

src/renderer/src/store/downloads.ts

@@ -1,7 +1,5 @@
 import { create } from 'zustand'
 import {
-  VIDEO_QUALITY_OPTIONS,
-  AUDIO_QUALITY_OPTIONS,
   type DownloadEvent,
   type DownloadMeta,
   type DownloadOptions,
@@ -71,13 +69,6 @@ export interface DownloadItem {
   mediaItemId?: string
 }
 
-// `satisfies` (not an annotation) so the tuple element types survive: under
-// noUncheckedIndexedAccess a `readonly string[]` index yields `string | undefined`,
-// but the const tuples keep `QUALITY_OPTIONS[kind][0]` known-defined (L168).
-export const QUALITY_OPTIONS = {
-  video: VIDEO_QUALITY_OPTIONS,
-  audio: AUDIO_QUALITY_OPTIONS
-} satisfies Record<MediaKind, readonly string[]>
 
 // Placeholder channel shown while metadata is still being fetched. Tracked as a
 // constant so the meta/error/done handlers can recognise and clear it instead of