AeroFetch/ROADMAP.md

# AeroFetch Roadmap — feature parity with Seal

AeroFetch is the Windows/Electron counterpart to [Seal](https://github.com/JunkFood02/Seal),
the Android Material-You frontend for [yt-dlp](https://github.com/yt-dlp/yt-dlp). The core
loop (probe → format pick → queue → download → history) is already in place. This document
tracks the remaining **gap**: everything Seal does that AeroFetch doesn't yet.

Sources: [Seal GitHub](https://github.com/JunkFood02/Seal) ·
[Seal on F-Droid](https://f-droid.org/packages/com.junkfood.seal/) ·
[It's FOSS overview](https://itsfoss.com/news/seal/).

> **See also:** [ROADMAP-PINCHFLAT.md](ROADMAP-PINCHFLAT.md) — a parallel track that extends
> AeroFetch from a one-shot downloader into a [Pinchflat](https://github.com/kieraneglin/pinchflat)-style
> media manager (index entire channels → organize into `Channel / Playlist / Title` folders →
> keep in sync), reusing the existing queue/history/options rather than replacing them.
>
> **Post-parity work** (YTDLnis-derived editing features + Windows-native/UX polish + reliability)
> is tracked at the end of this document under **Post-parity** (Phases L onward).

---

## Already at parity ✅

Video + audio download · audio → mp3 with embedded thumbnail/metadata · interactive format
picker (probe) · quality presets · queue + concurrency cap + cancel · download history
(open / show-in-folder) · clipboard auto-detect · light/dark theme · output folder +
filename template · yt-dlp version check · NSIS installer + portable build.

---

## Phase A — Core download power ✅ COMPLETE

A shared `DownloadOptions` model (`src/shared/ipc.ts`) carries the post-processing
choices end-to-end. Persisted defaults are editable in **Settings → Format &
post-processing** via a reusable `DownloadOptionsForm` component, which the download
bar also hosts in a collapsible per-download **Options** panel. The main process emits
the flags in `buildArgs` (`src/main/download.ts`). All items verified in the UI preview
(typecheck clean). **Real-download smoke test ✅ (2026-06-23):** crop-to-square cover,
audio re-encode (opus), video container + codec preference (mkv + vp9 merge), subtitle
embed (→ mov_text), chapter embed, and SponsorBlock-remove (output duration shrinks by the
cut segments) are now all verified against live yt-dlp + ffmpeg in
[real-download.integration.test.ts](test/real-download.integration.test.ts). That pass
found and fixed a real shipping bug — the bundled `ffprobe.exe` was missing (see CODE-AUDIT C1).

- [x] **Playlist downloads.** Probe now uses `yt-dlp -J --flat-playlist` and returns either
      a single video (with formats) or a flat playlist. The download bar shows a selection
      panel (scrollable checkbox list, select-all/none, live count) and enqueues each chosen
      entry as its own single-video download — reusing the existing queue/concurrency/history.
- [x] **Subtitles.** Download + embed (`--write-subs`, `--write-auto-subs`, `--sub-langs`,
      `--embed-subs`, `--convert-subs srt`); language field + auto-caption toggle.
- [x] **SponsorBlock.** `--sponsorblock-mark` / `--sponsorblock-remove` with a category
      multi-select (sponsor, intro, outro, selfpromo, music_offtopic…) + `--force-keyframes-at-cuts`.
- [x] **More audio formats.** Was mp3-only. Now best / mp3 / m4a / opus / flac / wav / aac
      via `--audio-format`.
- [x] **Video container + codec preference.** Container choice (mp4/mkv/webm) +
      preferred codec (`-S res,fps,vcodec:…`) to nudge toward av1 / vp9 / h264 without
      overriding the requested resolution.
- [x] **Embed chapters.** `--embed-chapters` toggle. (`--split-chapters` still TODO.)
- [x] **Embed thumbnail crop-to-square** for audio (Seal's "crop artwork") via thumbnail
      post-processor args. *Smoke-tested ✅: the embedded cover comes out a perfect square
      (360×360) — the `--ppa` crop recipe survives yt-dlp's shlex split + ffmpeg's filtergraph.*
- [x] **Per-download overrides.** Collapsible Options panel in the download bar (shared
      `DownloadOptionsForm`) so one download — or one playlist batch — can deviate from the
      persisted defaults; "Reset to defaults" clears it. Threads `options` through
      `addFromUrl → DownloadItem → startDownload` and is carried on retry.

## Phase B — Access & networking ✅ COMPLETE

`buildArgs`'s former `NetworkOptions` param is now `AccessOptions` (still in
`src/main/buildArgs.ts`) — it grew past pure networking once cookies and
filename/archive flags joined proxy/rate-limit/aria2c. **Smoke-tested ✅ (2026-06-23):**
`--restrict-filenames` (spaces → underscores) and `--download-archive` (a second run of
the same URL is skipped with no fresh download) are verified end-to-end. *Still untested
live: the sign-in window's cookie export — it needs an interactive login against a gated
video, which can't run unattended, so it stays reasoning + typecheck only. aria2c
(optional, binary not bundled) and proxy (needs a live proxy server) are likewise not
smoke-tested.*

- [x] **Cookies.** Settings → Cookies has a source picker:
      - *From a browser's cookie store* → `--cookies-from-browser <name>` (chrome/edge/
        firefox/brave/opera/vivaldi — `COOKIE_BROWSERS` in `src/shared/ipc.ts`).
      - *Sign-in window (built into AeroFetch)* → opens an Electron `BrowserWindow` on a
        persisted session partition (`persist:aerofetch-login`, see `src/main/cookies.ts`);
        OAuth/SSO popups are allowed through onto the same partition. Closing the window
        exports its cookies to a Netscape-format file (`userData/cookies.txt`) which
        `buildArgs` passes via `--cookies`. Settings → Cookies shows last-saved time + a
        "Clear saved cookies" button (also clears the partition's storage).
- [x] **aria2c external downloader.** Settings → Network has a "Use aria2c downloader"
      toggle; when on and `resources/bin/aria2c.exe` exists, `buildArgs` emits
      `--downloader <path> --downloader-args` (`ARIA2C_ARGS` in `src/main/buildArgs.ts`:
      `-x 16 -s 16 -k 1M`). Missing binary falls back silently to yt-dlp's own downloader
      (checked in `src/main/download.ts`). Binary is optional and not committed — see
      `resources/bin/README.md`.
- [x] **Proxy** (`--proxy`) and **rate limit** (`--limit-rate`). Settings → Network fields
      (`Settings.proxy` / `Settings.rateLimit`), threaded through `buildArgs`'s
      `AccessOptions` param.
- [x] **Restrict filenames** toggle (`--restrict-filenames`) + **download archive**
      (`--download-archive`, skip already-downloaded) — both in Settings → Filenames.
      The archive file lives at a fixed `userData/download-archive.txt`
      (`getDownloadArchivePath()` in `src/main/settings.ts`), not user-configurable.

## Phase C — Custom commands & yt-dlp management ✅ COMPLETE

Named `CommandTemplate`s (`src/shared/ipc.ts`) persist to `templates.json`
(`src/main/templates.ts`, mirrors `history.ts`'s plain-JSON pattern) and are managed
inline in **Settings → Custom commands** via `TemplateManager.tsx` — no modal, matching
the rest of the app's no-portal-overlay convention (see the Hint/Select comments re:
this dev machine's GPU/driver). A template's extra yt-dlp flags are shell-split
(`parseExtraArgs`, `src/main/buildArgs.ts`) and appended to the generated argv
immediately before the `--` URL terminator, so a template flag can override anything
chosen earlier. `Settings.customCommandEnabled` + `defaultTemplateId` apply a template
to every new download; the download bar's own **Custom command** panel lets a single
download override that default or opt out entirely (`extraArgs` on
`StartDownloadOptions`, mirroring the existing per-download `options` override).
`buildCommand()` (`src/main/download.ts`) now centralises settings/access/
options/extraArgs resolution, shared by both the real `startDownload` spawn and the new
preview path. All items verified in the UI preview + `npm run typecheck` +
`npm run test` (11 new unit tests covering `parseExtraArgs`, `formatCommandLine`, and
extraArgs ordering). **Smoke-tested ✅ (2026-06-23):** `parseExtraArgs('--write-info-json
--no-mtime')` splits into discrete tokens and the flags reach a live yt-dlp run — the
`.info.json` sidecar is written, confirming custom-command args take effect end-to-end.

- [x] **Custom command templates.** Named, editable templates of extra yt-dlp args
      (`CommandTemplate`), CRUD'd inline via `TemplateManager.tsx`; persisted to
      `templates.json`. **Pick a default** via `Settings.defaultTemplateId` (a Select in
      the Custom commands card). The **"run custom command" mode** is
      `Settings.customCommandEnabled`, applied to every new download unless overridden
      per-download in the download bar's Custom command panel.
- [x] **Command preview.** `IpcChannels.commandPreview` → `previewCommand()`
      (`src/main/download.ts`) builds the exact argv via the same `buildCommand()` path
      a real download would take, then renders it with `formatCommandLine`. Surfaced as
      a **Preview command** button in the download bar, with a Copy button.
- [x] **In-app yt-dlp updater.** `updateYtdlp(channel)` (`src/main/ytdlp.ts`) runs
      yt-dlp's own `--update-to stable|nightly`. Surfaced in **Settings → About**, right
      next to the existing version check, with a channel picker + result output.

## Phase D — Library, UX & notifications ✅ COMPLETE

History stays plain JSON (`history.json`, 500-entry cap) — search/filter/select are done
client-side over the already-small array, so the planned better-sqlite3 migration wasn't
needed for this phase and was deliberately skipped to avoid a native-module build step for
no functional gain at this scale. Failed downloads (pre-spawn rejections and in-flight
yt-dlp failures alike) now persist to a new `errorlog.json` (`src/main/errorlog.ts`,
200-entry cap) independent of the queue, so a report survives `Clear finished`. Native
notifications and the backup file both reuse existing settings/templates plumbing
(`getSettings`/`setSettings`, `listTemplates`/the new `replaceTemplates`) rather than adding
parallel storage. All items verified in the UI preview (typecheck + `npm run test` clean).

- [x] **History search + multi-select + filter** (video/audio) + bulk delete + **re-download**.
      `HistoryView.tsx` gained a search box, an All/Video/Audio filter, a "Select" mode with
      per-row checkboxes + select-all + **Delete selected** (new `historyRemoveMany` IPC,
      `src/main/history.ts`), and a per-row re-download button that re-queues the entry's
      URL/kind/quality via the existing `addFromUrl`.
- [x] **Native OS notifications** on completion / failure (Electron `Notification`,
      `src/main/download.ts`). Gated by a new **Notify when downloads finish** switch
      (`Settings.notifyOnComplete`, default on); clicking a notification refocuses the window.
- [x] **Private / incognito mode** — a download bar toggle (`DownloadBar.tsx`, sticky like an
      incognito tab) sets `DownloadItem.incognito`, which `store/downloads.ts` checks before
      ever calling `useHistory().add(...)`. Queue items show an eye-off badge when private.
- [x] **Backup / restore** settings + templates (export / import JSON). New
      `src/main/backup.ts` writes/reads `{ settings, templates }` via a save/open dialog;
      `replaceTemplates()` (`src/main/templates.ts`) does a full restore rather than a
      merge-by-id. Surfaced as **Settings → Backup & restore**.
- [x] **Error log / copy error report** view (Seal's debug report). New
      `src/main/errorlog.ts` persists every failure (pre-spawn rejection, spawn error, or
      non-zero yt-dlp exit); **Settings → Diagnostics** lists recent entries with
      **Copy full report** and **Clear log**.

## Phase E — Theming & platform polish ✅ COMPLETE

Some items are Android-specific in Seal and adapted to Windows here.

- [x] **Theme presets + "follow system" and high-contrast.** Settings → Appearance has a
      Theme select (Light / Dark / **Follow system**) and four accent presets — Toffee
      (original), Slate, Evergreen, Lavender — each a 16-stop `BrandVariants` ramp sharing
      toffee's lightness curve at a different hue (`src/renderer/src/theme.ts`). "Follow
      system" reads Electron's `nativeTheme.shouldUseDarkColors` in the main process
      (`src/main/index.ts`'s `resolveBackgroundMode`/`registerSystemThemeBridge`, pushed to
      the renderer over a new `system-theme:update` channel into
      `src/renderer/src/store/systemTheme.ts`) so the native window background stays in sync
      too, not just the in-page theme. High contrast: `nativeTheme.shouldUseHighContrastColors`
      surfaces as a status row in Settings → Appearance with a shortcut to Windows' contrast
      settings (`ms-settings:easeofaccess-highcontrast`); actual color overrides are left to
      Chromium's native `forced-colors` handling since nothing in the app sets
      `forced-color-adjust: none`. The sidebar's quick toggle still works under "system" — it
      sets an explicit light/dark away from whatever's currently resolved, breaking out of
      auto. Verified in the UI preview (typecheck + `npm run test` clean): default Toffee,
      switching to Slate/Evergreen/Lavender, Light/Dark/Follow-system, and the sidebar
      toggle's break-out-of-system behavior all checked visually.
- [x] **Windows "open with" / share integration.** Both mechanisms named above, since a Win32
      (non-MSIX) app can't register as an actual Share Target:
      - **`aerofetch://` protocol** (`aerofetch://download?url=<encoded>`) — registered at
        install time via `electron-builder.yml`'s `protocols` field (NSIS), and at runtime via
        `app.setAsDefaultProtocolClient` in `src/main/index.ts` (covers the portable build and
        dev, which have no installer step to do it for them).
      - **Explorer "Send to AeroFetch"** — `src/main/deeplink.ts`'s `registerSendToShortcut()`
        writes a `.lnk` into `%APPDATA%\Microsoft\Windows\SendTo` via Electron's
        `shell.writeShortcutLink` (no native deps). Sending a `.url` Internet Shortcut file
        (what Explorer/browsers create from "Create shortcut"/dragging a tab to the desktop)
        passes its path as argv; `extractIncomingUrl()` parses the `URL=` line.

      Both paths funnel through the same `extractIncomingUrl()` (only ever forwards http(s)
      targets — same restriction as the existing external-link window-open handler) and a new
      `external-url` IPC push channel. The renderer surfaces the incoming link via
      `DownloadBar.tsx`'s existing clipboard-suggestion banner (now labeled "Link received:"
      for this source instead of "Use copied link?") rather than a new UI element. Added
      `app.requestSingleInstanceLock()` + a `second-instance` handler so a second invocation
      (the OS relaunching us for the protocol/SendTo case) hands its link to the already-running
      window instead of opening a duplicate. `extractIncomingUrl()`'s parsing/validation logic
      has 10 new unit tests (`test/deeplink.test.ts`); typecheck and the full suite are clean.
      *Caveat: the OS-level wiring (protocol registration, second-instance routing, the SendTo
      shortcut) is main-process/Electron-only and can't be exercised in the Vite browser
      preview used elsewhere in this phase — worth a real install + a manual
      `aerofetch://download?url=...` / "Send to" smoke test, same spirit as Phases A–C's
      real-download caveats.*
- [x] **Onboarding / welcome screen** on first run. `Settings.hasCompletedOnboarding`
      (default `false`, persisted) gates a full-screen `Onboarding.tsx` rendered in place of
      the sidebar + main content in `App.tsx` — not a Fluent `Dialog`, since this app avoids
      Fluent's portal-based overlays entirely (GPU/driver blank-overlay issue noted in
      `src/main/index.ts` and `Select.tsx`). Shows the brand mark, a one-line pitch, the
      download-folder picker (same field as Settings → Downloads), three tip bullets, and a
      "Get started" button that flips the flag. Gated on the settings store's `loaded` flag
      so a returning user's real settings can never get clobbered by a one-frame flash of the
      default-false state. Verified in the UI preview (typecheck + `npm run test` clean):
      screen renders, folder field/browse work, "Get started" dismisses into the normal app.

---

## Not portable from Seal (noted for completeness)

- SAF directory picker (Android storage) → already covered by the native folder dialog.
- Android share-sheet / quick-download-on-share → mapped to Phase E's `aerofetch://` protocol
  + Explorer "Send to" integration (a true Share Target needs an MSIX package, out of scope
  for this app's NSIS/portable distribution).
- F-Droid distribution → N/A (AeroFetch ships NSIS + portable).

---

# Post-parity — editing, native polish & reliability

With both parity tracks complete — Seal (Phases A–E above) and the
[Pinchflat media-manager roadmap](ROADMAP-PINCHFLAT.md) (Phases F–K ✅) — this final track
collects what's left, from two sources:

1. A **feature study of [YTDLnis](https://github.com/deniscerri/ytdlnis)** (the other major
   Android yt-dlp frontend), keeping only the features AeroFetch doesn't already have.
2. A **Windows-native + daily-use UX gap analysis** of AeroFetch itself (things neither Seal
   nor Pinchflat cover, but that a desktop app should do).

Nothing here is built yet — every box is unchecked. Phases continue the existing lettering
(A–E Seal, F–K Pinchflat) from **L onward**, and each item carries the yt-dlp flag and the
AeroFetch file it touches so it can be driven straight from the existing `buildArgs` /
`DownloadOptions` / queue plumbing rather than new infrastructure.

Sources: [YTDLnis GitHub](https://github.com/deniscerri/ytdlnis) ·
[YTDLnis docs](https://ytdlnis.org/) · [YTDLnis changelogs](https://ytdlnis.org/changelogs/) ·
[F-Droid listing](https://f-droid.org/packages/com.deniscerri.ytdl/).

### Already at parity with YTDLnis (do **not** rebuild)

Format/quality/container picking · SponsorBlock (remove/mark + embed-as-chapters) · embed
subtitles/metadata/chapters · cookies + login · custom command templates · backup/restore ·
**Observe Sources** (= our Phase J watched sources + RSS) · incognito mode · history with
filter + bulk re-download · filename templating · self-managing yt-dlp + ffmpeg binaries.
AeroFetch is even with, or ahead of, YTDLnis on all of these.

## Phase L — Media editing (YTDLnis headline features)

YTDLnis's signature differentiator. The keyframe plumbing already exists in AeroFetch
(`--force-keyframes-at-cuts` is emitted today for SponsorBlock-remove in
`src/main/buildArgs.ts`), so this is cheaper than it looks.

- [x] **Trim / cut downloads.** Keep only chosen time ranges (multiple allowed). →
      `parseTrimSections` (`src/main/buildArgs.ts`) normalises raw user text into yt-dlp
      `--download-sections "*START-END"` specs (+ `--force-keyframes-at-cuts`, deduped against
      SponsorBlock-remove). Threaded as `StartDownloadOptions.trim` through
      `store/downloads.ts`, surfaced as a collapsible **Trim** panel in `DownloadBar.tsx`
      (single downloads only). *Implemented + unit-tested (`buildArgs.test.ts` — 7 new tests;
      typecheck + test green). Live smoke test pending, plus two follow-ups: timestamp-range
      only so far (chapter-based cuts via the probe `chapters[]` array, and a scrubber/preview
      player, still TODO).*
- [x] **Split by chapters into separate files.** → `--split-chapters` (already flagged as a
      TODO in Phase A above). One toggle on `DownloadOptions` +
      `src/renderer/src/components/DownloadOptionsForm.tsx`; pairs naturally with trim. yt-dlp
      keeps the full file and writes per-chapter files via its default `chapter:` template.
      *Implemented + unit-tested (`buildArgs.test.ts`, typecheck + test green); live smoke test
      still pending.*
- [ ] **Metadata editing before download.** Change title / author / artist pre-download
      (YTDLnis: "modify metadata such as title and author"). → `--parse-metadata` /
      `--replace-in-metadata`; fits the audio path. Good for building a clean music library
      where the source title is messy. *Held: the exact set-a-literal recipe is fragile
      (`--parse-metadata FROM:TO` splits on a colon that titles often contain;
      `--replace-in-metadata FIELD REGEX REPLACE` has empty-field + regex-replacement edge
      cases) — confirm against a live yt-dlp run before wiring it, rather than guessing the
      flag.*

## Phase M — Queue & daily-use UX ✅ COMPLETE

Neither Seal nor Pinchflat covers these; they're what makes the queue pleasant to live in.
Today `src/renderer/src/store/downloads.ts` has cancel + retry only.

- [x] **Pause / resume individual downloads.** → yt-dlp resumes `.part` files via `--continue`
      (already the default). *Done: `pauseDownload()` (`src/main/download.ts`) reuses the
      `taskkill /T /F` tree-kill via a new `killTree` helper but flags the record `paused` so
      the close/error handlers stay silent (no error event/log/notification); new
      `download:pause` IPC + preload bridge. Renderer `pause`/`resume` (`store/downloads.ts`) +
      a `paused` status: pause frees a concurrency slot, resume re-queues WITHOUT resetting
      progress so the relaunch continues the partial. Pause/Resume buttons + a frozen progress
      row in `QueueItem.tsx`; paused items survive "Clear finished". typecheck + test green;
      live resume-continues-the-.part still wants a smoke test.*
- [x] **Reorder / prioritize the queue.** *Done as a **"Download next"** action rather than
      drag: since the queue renders newest-first while `pump()` promotes oldest-first, a
      reposition primitive is clearer than drag. `prioritize(id)` (`store/downloads.ts`) moves a
      queued item to the front of the promotion order; an up-arrow button on queued rows
      (`QueueItem.tsx`).*
- [x] **Aggregate progress + total ETA + combined speed.** A header strip on the Downloads
      view summing bytes/speed across active items. Feeds straight into Phase O's taskbar
      progress bar. *Done: pure `summarizeQueue` (`store/queueStats.ts`) → a strip in
      `DownloadsView.tsx` (overall %, combined speed, longest-ETA "time left"); unit-tested
      (`test/queueStats.test.ts`). A true remaining-bytes combined ETA is still out of reach —
      we don't track per-item sizes — so "time left" is the longest single ETA.*
- [x] **Drag-and-drop a link or `.url` file onto the window.** *Done: the download card
      (`DownloadBar.tsx`) handles `onDragOver`/`onDrop` with a dashed-outline drag highlight,
      accepting `text/uri-list`/`text/plain` (`firstUrl`) and dropped Windows `.url`
      Internet-Shortcut files (`parseUrlFile`, read via `File.text()`); both http(s)-validated by
      the existing `looksLikeUrl`. A dropped link fills the URL field.*
- [x] **Retry all failed.** One action that re-enqueues every failed item. *Done:
      `retryAll()` in `store/downloads.ts` re-queues all `error` items + a "Retry all failed (N)"
      button in `DownloadsView.tsx`. (Re-queues live queue items rather than reading
      `errorlog.json` — same effect for the on-screen failures.)*
- [x] **Duplicate detection.** Warn ("you already have this") before enqueuing a URL already in
      the active queue. *Done: pure `sameVideo()` (`store/queueStats.ts`, YouTube-id aware +
      normalised-URL fallback) drives a "Already in your queue — Download anyway?" banner in
      `DownloadBar.tsx`; unit-tested. Checks the live queue (which still holds recently-completed
      items); cross-checking `history.json` for older downloads is a possible extension.*
- [x] **Per-download scheduling + "save for later."** *Done: a `saved` status + optional
      `scheduledFor` (`store/downloads.ts`); `pump()` ignores `saved` (the time gate), and a 15s
      ticker promotes due scheduled items to `queued`. UI: a **Schedule** panel with a native
      `datetime-local` input in `DownloadBar.tsx` (future time parks the new download as
      scheduled), plus per-row **Save for later** / **Add to queue** actions in `QueueItem.tsx`;
      saved items survive "Clear finished". Distinct from the Phase J `--sync` schedule (which is
      for *sources*). **Limitation: the queue isn't persisted, so a schedule only fires while
      AeroFetch is running** — noted in the UI hint and the code.*

## Phase N — Power-user surface ✅ COMPLETE

YTDLnis leans hard into this; AeroFetch had the building blocks (command preview, templates,
per-item `options`) but not the surfaces. typecheck + test + `npm run build` clean.

- [x] **Built-in terminal mode.** *Done: `src/main/terminal.ts` runs the bundled yt-dlp with
      raw user args (binary fixed; gated on `customCommandEnabled`, enforced in main), streaming
      stdout/stderr line-by-line over a new `terminal:output` channel (`terminal:run`/`cancel`
      IPC + preload). New `TerminalView.tsx` (args box, Run/Stop/Clear, live log, Ctrl+Enter)
      and a Terminal sidebar tab.*
- [x] **Per-playlist-item editing.** *Done: the playlist panel in `DownloadBar.tsx` gained a
      per-row video/audio toggle + **All video** / **All audio** batch buttons; `addPlaylist`
      enqueues via `addMany` with each entry's own kind (quality falls back to that kind's
      default). Per-item exact-format selection (needs probing each entry) left as a further
      extension.*
- [x] **Weighted format sorting ("format aspect importance").** *Done: a `formatSort` field on
      `DownloadOptions` (raw yt-dlp `-S` string); when set it emits `-S <value>`, overriding the
      codec tiebreaker (`buildArgs.ts`); an "advanced" input in `DownloadOptionsForm`. Unit-tested.*
- [x] **URL-regex template auto-matching.** *Done: `CommandTemplate.urlPattern` (regex);
      `selectExtraArgs` auto-applies a matching template ahead of the global default
      (`matchesUrl`, bad patterns never match), URL threaded via `resolveExtraArgs`. urlPattern
      field in `TemplateManager` + persisted in `templates.ts`. Unit-tested.*
- [x] **Command palette + keyboard shortcuts.** *Done: a portal-free `CommandPalette.tsx`
      (filter, ↑/↓, Enter, Esc) opened with Ctrl/Cmd+K from `App.tsx`; actions = navigate tabs,
      new download (focuses the `aerofetch-url` input), toggle theme.*

## Phase O — Windows-native integration & discoverability ✅ COMPLETE

All in the main process. typecheck + test + `npm run build` clean.

- [x] **Taskbar progress bar.** *Done: renderer pushes the `summarizeQueue` aggregate over a new
      `taskbar:progress` channel (App-level store subscription, no re-render);
      `mainWindow.setProgressBar` with `mode: 'normal' | 'error'` (red when any failed) and `-1`
      to clear when idle.*
- [x] **System tray + minimize-to-tray.** *Done: `src/main/tray.ts` builds a `Tray` (icon resolved
      via `getAppIconPath()`; `build/icon.ico` added to electron-builder `extraResources` for
      prod) with Show / Quit. A new `Settings.minimizeToTray` (Settings → Appearance) makes the
      window's `close` hide to tray instead of quitting; `before-quit`/tray-Quit set an
      `isQuitting` flag so real exits still work.*
- [x] **Jump list.** *Done: `app.setUserTasks` adds an "Open AeroFetch" task (focuses the
      single instance). **Thumbnail toolbar buttons deferred** — they need per-button `NativeImage`
      assets this repo doesn't have tooling to generate here.*
- [ ] **Taskbar overlay badge** (`win.setOverlayIcon`) showing active-download count / error state.
      *Deferred: a numeric/status badge needs a drawn `NativeImage` (no canvas in main); the
      taskbar progress bar's `error` mode already signals failures.*
- [x] **Settings discoverability.** *Done: a search box atop `SettingsView` filters the ~11 cards
      live by matching each card's text (DOM `display` toggle keyed off the root's children — no
      per-card refactor), with a "no settings match" hint.*

## Phase P — Reliability, longevity & trust

The least glamorous, highest-leverage track: make sure what's *already shipped* actually works,
keep YouTube downloads working as the platform tightens, and remove first-run friction.

- [ ] **PO Token generation.** YTDLnis mints YouTube tokens in a WebView to dodge throttling
      and "Sign in to confirm you're not a bot." This is becoming **required** for YouTube to
      keep working at all. → reuse the existing persisted Electron `BrowserWindow`
      (`persist:aerofetch-login` in `src/main/cookies.ts`) to host a token-minting script, or
      support a PO-token provider, passed via `--extractor-args youtube:po_token=…`. A
      longevity hedge more than a feature.
- [ ] **Verify the shipped-but-untested OS wiring** (flagged across both parity tracks as
      "reasoning + typecheck only"). A single real NSIS-install smoke-test pass over: the
      cookies sign-in window export · the `aerofetch://` protocol + Explorer "Send to" · the
      scheduled `--sync` + RSS fast-check (Phase J) · aria2c · proxy. Converts a lot of
      "probably works" into "verified."
- [ ] **Code signing.** The unsigned `.exe` triggers SmartScreen "Run anyway" — the single
      biggest first-run friction for anyone you share it with. electron-builder `win` signing
      (OV/EV cert); EV builds SmartScreen reputation fastest.
- [ ] **i18n / language setting.** Carried over from Phase E (deferred). YTDLnis and Seal both
      ship many languages. Large but optional — needs an i18n library + string extraction, with
      translations arriving incrementally.

---

## Post-parity — what we reuse vs. build

**Reuse unchanged:** `buildArgs`/`buildCommand` flag emission, `DownloadOptions` +
`DownloadOptionsForm`, the renderer queue scheduler + concurrency cap + per-item `options`,
the persisted cookies `BrowserWindow`, the probe's `chapters[]`/format data, `errorlog.ts`,
`CommandTemplate`s, `extractIncomingUrl()`, and the self-managing binary updater.

**Build new:** the trim/split UI + `--download-sections`/`--split-chapters` wiring (L), the
pause/reorder/schedule queue states (M), the terminal view + per-item playlist editor (N), the
main-process taskbar/tray/jumplist integration (O), and the PO-token provider (P).

## Post-parity — suggested order

**L is the high-value headline** — trim + split-chapters share one UI surface and the keyframe
plumbing already exists, so they land cheaply and give AeroFetch YTDLnis's marquee capability.
Then **P's PO-token + verify-wiring** as a reliability block (keeps YouTube working and de-risks
shipped features). **M** and **O** are the daily-use polish and pair well (aggregate progress →
taskbar bar). **N** is the power-user surface, each item independently shippable. Each phase is
self-contained and rebuild-gated (`npm run typecheck` + `npm run test` + `npm run build`) the
same way Phases A–K were.