feat(config+ux): batch #5 — source maps, integration script, copy, redownload options

Clean config/copy items (Phase 7):
- L170: build.sourcemap 'hidden' on main/preload/renderer — emit .map for offline
  crash symbolication (of the CC8 logger's raw stacks) without exposing them.
- L34: add `test:integration` npm script (AEROFETCH_REAL_DOWNLOAD=1) for the opt-in
  real-download suite; stays out of `npm test` (needs network + live yt-dlp).
- L87: HistoryEntry carries the original `options`; redownload replays them so a
  re-download reproduces the same post-processing instead of the current defaults.
- L96: folder "Browse" buttons -> "Browse…" (they open the OS picker).
- L97: PO-token placeholder "(none)" -> "Optional -- paste a token" (consistent).
- Ticked already-resolved: L99 (M28 aria-label), L113 (UX2 tooltip=aria-label),
  L95 (usage follows verb/modifier rule), L172 (skipLibCheck accepted).

typecheck + 268 tests + eslint + prettier green (touched files LF/clean).

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

src/renderer/src/components/HistoryView.tsx

@@ -196,6 +196,9 @@ export function HistoryView(): React.JSX.Element {
       title: h.title,
       channel: h.channel,
       thumbnail: h.thumbnail,
+      // Replay the original post-processing options (L87); undefined falls back to
+      // the global defaults for entries recorded before this was carried.
+      options: h.options,
       format: h.formatId
         ? { id: h.formatId, hasAudio: h.formatHasAudio ?? false, label: h.quality }
         : undefined

src/renderer/src/components/settings/DownloadsCard.tsx

@@ -71,7 +71,7 @@ export function DownloadsCard(): React.JSX.Element {
             onChange={(_, d) => update({ videoDir: d.value })}
           />
           <Button icon={<FolderRegular />} onClick={() => chooseDir('videoDir')}>
-            Browse
+            Browse…
           </Button>
           {videoDir && (
             <Button appearance="subtle" onClick={() => clearDir('videoDir')}>
@@ -94,7 +94,7 @@ export function DownloadsCard(): React.JSX.Element {
             onChange={(_, d) => update({ audioDir: d.value })}
           />
           <Button icon={<FolderRegular />} onClick={() => chooseDir('audioDir')}>
-            Browse
+            Browse…
           </Button>
           {audioDir && (
             <Button appearance="subtle" onClick={() => clearDir('audioDir')}>

src/renderer/src/components/settings/NetworkCard.tsx

@@ -86,7 +86,7 @@ export function NetworkCard(): React.JSX.Element {
             type="password"
             style={{ flexGrow: 1 }}
             value={youtubePoToken}
-            placeholder="(none)"
+            placeholder="Optional -- paste a token"
             onChange={(_, d) => {
               update({ youtubePoToken: d.value })
               setPotHint(null)

src/renderer/src/store/downloads.ts

@@ -44,6 +44,9 @@ function recordCompletion(item: DownloadItem): void {
       filePath: item.filePath,
       sizeLabel: item.sizeLabel,
       thumbnail: item.thumbnail,
+      // Carry the post-processing options so a re-download reproduces the same
+      // output rather than the current global defaults (L87).
+      options: item.options,
       completedAt: Date.now()
     })
   }

src/shared/ipc.ts

@@ -731,6 +731,10 @@ export interface HistoryEntry {
   filePath?: string
   sizeLabel?: string
   thumbnail?: string
+  /** The per-download post-processing options used originally, carried so a
+   *  re-download reproduces the same output (subtitles, SponsorBlock, container,
+   *  codec, …) instead of silently falling back to the current global defaults (L87). */
+  options?: DownloadOptions
   /** epoch milliseconds */
   completedAt: number
 }