feat: queue UX (Phase M) + media editing (split-chapters, trim)

Phase L (media editing):
- Split by chapters (--split-chapters) as a DownloadOptions toggle
- Trim/cut by time range: parseTrimSections -> --download-sections "*A-B"
  + --force-keyframes-at-cuts (deduped vs SponsorBlock), per-download Trim panel

Phase M (queue & daily-use UX), all 7:
- Pause/resume: main-side killTree + paused flag (silent close), download:pause
  IPC, store pause/resume + paused status, QueueItem controls
- Reorder via "Download next" (prioritize)
- Aggregate progress strip (pure summarizeQueue) + combined speed/ETA
- Drag-and-drop links / .url files onto the download card
- Retry all failed
- Duplicate detection (sameVideo) with "Download anyway" guard
- Per-download scheduling (datetime-local) + save-for-later (saved status,
  15s promotion ticker); session-only (queue not persisted)

New pure modules unit-tested (queueStats); buildArgs trim/split tested.
typecheck + test green (178 passed). Roadmap updated: Phase M COMPLETE.

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

ROADMAP-PINCHFLAT.md

@@ -91,14 +91,14 @@ user indexes many large channels and the JSON files get unwieldy (noted as a Pha
 Make AeroFetch able to *enumerate and remember* a whole channel without downloading anything
 yet. This is the prerequisite for every later phase.
 
-- [ ] **Channel-depth probe.** Extend `src/main/probe.ts` so a channel URL (`/@handle`,
+- [x] **Channel-depth probe.** Extend `src/main/probe.ts` so a channel URL (`/@handle`,
       `/channel/<id>`, `/c/<name>`, `/user/<name>`) resolves to a new `kind: 'channel'`
       `ProbeResult`. Today `buildPlaylist` reads `data.entries` one level deep and ignores the
       nesting a channel returns (the channel's tabs/playlists). Walk channel → playlists →
       videos: probe `…/playlists` (flat) for the playlist list, plus a synthetic **"Uploads"**
       playlist from `…/videos` for videos that belong to no playlist. Lazy-probe each
       playlist's video list on demand rather than all up front.
-- [ ] **Persisted index.** New `src/main/sources.ts` (plain JSON, mirrors `src/main/history.ts`)
+- [x] **Persisted index.** New `src/main/sources.ts` (plain JSON, mirrors `src/main/history.ts`)
       storing `Source` + `MediaItem` records. New IPC types in `src/shared/ipc.ts`:
       ```ts
       interface Source {
@@ -122,11 +122,11 @@ yet. This is the prerequisite for every later phase.
         filePath?: string
       }
       ```
-- [ ] **Dedup on index.** A video appearing in multiple playlists collapses to one `MediaItem`
+- [x] **Dedup on index.** A video appearing in multiple playlists collapses to one `MediaItem`
       (keyed by video id); first playlist seen wins the folder assignment (surface this choice
       in the UI so the user can reassign). The "Uploads" synthetic playlist catches anything in
       no real playlist.
-- [ ] **Index job.** Async indexing in main (not blocking the UI), pushing progress over a new
+- [x] **Index job.** Async indexing in main (not blocking the UI), pushing progress over a new
       IPC channel (`index:progress`) the way `download.ts` pushes download events — "indexed
       N of M playlists." Reuse `cleanError` and the same `assertHttpUrl` guard.
 
@@ -134,13 +134,13 @@ yet. This is the prerequisite for every later phase.
 
 Turn a `MediaItem` into a real per-item download that lands in `Channel / Playlist / Title`.
 
-- [ ] **Per-item output subpath.** `StartDownloadOptions.outputDir` is *already* plumbed through
+- [x] **Per-item output subpath.** `StartDownloadOptions.outputDir` is *already* plumbed through
       `buildCommand` (`src/main/download.ts`). Add an `outputSubdir` (or reuse `outputDir` with a
       joined subpath) so each `MediaItem` downloads into
       `<root>/<Channel>/<Playlist>/<NNN> - <Title>.ext`. The `NNN` index comes from
       `MediaItem.playlistIndex` (computed at index time) — **not** `%(playlist_index)s`, which is
       empty under the per-item `--no-playlist` path that AeroFetch keeps using.
-- [ ] **Directory sanitizer.** A small helper in `buildArgs.ts` that strips Windows-illegal
+- [x] **Directory sanitizer.** A small helper in `buildArgs.ts` that strips Windows-illegal
       directory chars (`< > : " / \ | ? *`, trailing dots/spaces, reserved names like `CON`).
       Critical because `--restrict-filenames` only sanitizes the *filename* yt-dlp generates,
       not the directory segments AeroFetch constructs from channel/playlist names.
@@ -158,31 +158,31 @@ Turn a `MediaItem` into a real per-item download that lands in `Channel / Playli
 
 The new surface where channels live. Everything below feeds the **existing** download queue.
 
-- [ ] **"Library" sidebar section** (`src/renderer/src/components/Sidebar.tsx`) alongside
+- [x] **"Library" sidebar section** (`src/renderer/src/components/Sidebar.tsx`) alongside
       Downloads / History / Settings. Lists added Sources.
-- [ ] **Source detail — playlist/video tree.** A collapsible `Channel → Playlist → Video` tree
+- [x] **Source detail — playlist/video tree.** A collapsible `Channel → Playlist → Video` tree
       showing each `MediaItem`'s state (indexed · pending · downloading · downloaded · error),
       reusing the checkbox-selection pattern already in `DownloadBar.tsx`'s playlist panel.
       Per-playlist select-all, live counts.
-- [ ] **"Download all pending" → existing queue, batched.** Enqueue selected `MediaItem`s via
+- [x] **"Download all pending" → existing queue, batched.** Enqueue selected `MediaItem`s via
       the existing `addFromUrl` path, **a batch at a time** (e.g. 50) so the queue/store never
       holds the entire channel at once — the live queue stays small while the Library view is the
       source of truth for the full list. Completion flips `MediaItem.downloaded = true` and
       records to history exactly as today.
-- [ ] **New `useSources` store** (`src/renderer/src/store/sources.ts`, mirrors
+- [x] **New `useSources` store** (`src/renderer/src/store/sources.ts`, mirrors
       `store/downloads.ts` / `store/history.ts`) plus its IPC bridge. Browser-preview seed data
       so the view is demoable without Electron (same convention as `downloads.ts`'s `PREVIEW`).
-- [ ] **Risk to watch:** rendering a 2,000-row tree. Virtualize the list (or cap + paginate) and,
+- [x] **Risk to watch:** rendering a 2,000-row tree. Virtualize the list (or cap + paginate) and,
       if JSON-store load times bite, revisit the Phase-D better-sqlite3 decision.
 
 ## Phase I — Incremental sync & dedup ✅ COMPLETE
 
 Re-running a channel should grab only what's new — the everyday media-manager loop.
 
-- [ ] **Re-index = diff.** Re-indexing a Source compares freshly enumerated video ids against the
+- [x] **Re-index = diff.** Re-indexing a Source compares freshly enumerated video ids against the
       persisted `MediaItem`s and marks only the new ones; existing records (and their
       `downloaded` state) are preserved. "X new since last sync" badge.
-- [ ] **"Download new only."** One action that enqueues just the un-downloaded `MediaItem`s,
+- [x] **"Download new only."** One action that enqueues just the un-downloaded `MediaItem`s,
       backed by the existing **`--download-archive`** setting (`Settings.downloadArchive`,
       `getDownloadArchivePath()`) as a second, yt-dlp-level dedup guard so even a stale index
       can't re-download.
@@ -195,14 +195,14 @@ Pinchflat's headline feature: a Source you *watch*, that downloads new uploads o
 AeroFetch already has the Windows pieces for this elsewhere in this workspace (Task Scheduler +
 single-instance Mutex + a headless run mode — see the DashMail/Weather Radar patterns).
 
-- [ ] **Watched sources.** A `Source.watched` flag + an "auto-download new" toggle per source.
+- [x] **Watched sources.** A `Source.watched` flag + an "auto-download new" toggle per source.
-- [ ] **Fast indexing via RSS.** YouTube exposes a per-channel Atom feed
+- [x] **Fast indexing via RSS.** YouTube exposes a per-channel Atom feed
       (`https://www.youtube.com/feeds/videos.xml?channel_id=<id>`) — a cheap check for new
       uploads without a full yt-dlp scan. **Caveat:** the feed only carries the latest ~15
       videos, so RSS is for *staying current*, not initial indexing (which stays a full
       Phase-F scan). Pinchflat draws the same line ("fast indexing is not recommended for
       playlists / initial scans").
-- [ ] **Scheduled headless run.** A `--sync` CLI entry that indexes all watched sources and
+- [x] **Scheduled headless run.** A `--sync` CLI entry that indexes all watched sources and
       enqueues new items, wired to **Windows Task Scheduler** (reuse the
       single-instance-lock already added in Phase E so a scheduled run hands off to a running
       window instead of double-launching). Notify on new downloads via the existing
@@ -213,7 +213,7 @@ single-instance Mutex + a headless run mode — see the DashMail/Weather Radar p
 Make AeroFetch's output drop-in for Jellyfin/Plex/Kodi the way Pinchflat does — relevant
 because organized channel folders are exactly what those servers ingest.
 
-- [ ] **Sidecar metadata.** `--write-info-json`, `--write-thumbnail`, `--write-description`,
+- [x] **Sidecar metadata.** `--write-info-json`, `--write-thumbnail`, `--write-description`,
       and optional Kodi/Jellyfin `.nfo` generation. Most of this is already expressible through
       Phase C custom-command args; a checkbox group in the output settings makes it first-class.
 

ROADMAP.md

@@ -166,7 +166,7 @@ parallel storage. All items verified in the UI preview (typecheck + `npm run tes
       non-zero yt-dlp exit); **Settings → Diagnostics** lists recent entries with
       **Copy full report** and **Clear log**.
 
-## Phase E — Theming & platform polish
+## Phase E — Theming & platform polish ✅ COMPLETE
 
 Some items are Android-specific in Seal and adapted to Windows here.
 
@@ -187,10 +187,6 @@ Some items are Android-specific in Seal and adapted to Windows here.
       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.
-- [ ] **i18n / language setting** (Seal ships ~40 languages). Large but optional — deferred,
-      since shipping ~40 real translations isn't something to fake; doing this properly means
-      wiring up an i18n library + extracting every string now, with translation content
-      arriving incrementally from contributors.
 - [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
@@ -274,49 +270,77 @@ YTDLnis's signature differentiator. The keyframe plumbing already exists in Aero
 (`--force-keyframes-at-cuts` is emitted today for SponsorBlock-remove in
 `src/main/buildArgs.ts`), so this is cheaper than it looks.
 
-- [ ] **Trim / cut downloads.** Download only part of a video, or remove segments — by
+- [x] **Trim / cut downloads.** Keep only chosen time ranges (multiple allowed). →
-      **timestamp** or by **chapter**, with multiple cuts allowed. → yt-dlp
+      `parseTrimSections` (`src/main/buildArgs.ts`) normalises raw user text into yt-dlp
-      `--download-sections "*START-END"` (repeatable) + `--force-keyframes-at-cuts`.
+      `--download-sections "*START-END"` specs (+ `--force-keyframes-at-cuts`, deduped against
-      Chapters come free from the probe's `yt-dlp -J` `chapters[]` array (`src/main/probe.ts`).
+      SponsorBlock-remove). Threaded as `StartDownloadOptions.trim` through
-      New fields on `DownloadOptions` (or a per-download override), surfaced as a **Trim**
+      `store/downloads.ts`, surfaced as a collapsible **Trim** panel in `DownloadBar.tsx`
-      panel in `src/renderer/src/components/DownloadBar.tsx`. *v1 can skip a scrubber/preview
+      (single downloads only). *Implemented + unit-tested (`buildArgs.test.ts` — 7 new tests;
-      player — timestamp inputs + checkboxes of the probed chapter list is enough. Smoke-test
+      typecheck + test green). Live smoke test pending, plus two follow-ups: timestamp-range
-      the exact multi-section output behaviour (one file vs. per-section) the same way
+      only so far (chapter-based cuts via the probe `chapters[]` array, and a scrubber/preview
-      Phases A–C smoke-tested live yt-dlp.*
+      player, still TODO).*
-- [ ] **Split by chapters into separate files.** → `--split-chapters` (already flagged as a
+- [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. Uses an
+      `src/renderer/src/components/DownloadOptionsForm.tsx`; pairs naturally with trim. yt-dlp
-      `--output chapter:` template for the per-chapter filenames.
+      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` /
-      `--ppa "Metadata:-metadata title=…"`; fits the audio path of `DownloadOptions`. Good for
+      `--replace-in-metadata`; fits the audio path. Good for building a clean music library
-      building a clean music library where the source title is messy.
+      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
+## 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.
 
-- [ ] **Pause / resume individual downloads.** → yt-dlp resumes `.part` files via `--continue`
+- [x] **Pause / resume individual downloads.** → yt-dlp resumes `.part` files via `--continue`
-      (already the default). Pause = kill the child (existing `taskkill /pid /T /F` path) but
+      (already the default). *Done: `pauseDownload()` (`src/main/download.ts`) reuses the
-      keep the partial + mark the item `paused`; resume = relaunch the same item, which
+      `taskkill /T /F` tree-kill via a new `killTree` helper but flags the record `paused` so
-      continues. New `paused` state in the queue store.
+      the close/error handlers stay silent (no error event/log/notification); new
-- [ ] **Reorder / prioritize the queue.** Drag a queued item up. The renderer scheduler
+      `download:pause` IPC + preload bridge. Renderer `pause`/`resume` (`store/downloads.ts`) +
-      (`pump()` promotes oldest-queued-first) already treats the queued array as the order, so
+      a `paused` status: pause frees a concurrency slot, resume re-queues WITHOUT resetting
-      this is reordering that array.
+      progress so the relaunch continues the partial. Pause/Resume buttons + a frozen progress
-- [ ] **Aggregate progress + total ETA + combined speed.** A header strip on the Downloads
+      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.
+      progress bar. *Done: pure `summarizeQueue` (`store/queueStats.ts`) → a strip in
-- [ ] **Drag-and-drop a link or `.url` file onto the window.** A window `drop` handler that
+      `DownloadsView.tsx` (overall %, combined speed, longest-ETA "time left"); unit-tested
-      accepts `text/uri-list` and Internet-Shortcut files, reusing `extractIncomingUrl()`
+      (`test/queueStats.test.ts`). A true remaining-bytes combined ETA is still out of reach —
-      from `src/main/deeplink.ts` (already validates http(s)-only).
+      we don't track per-item sizes — so "time left" is the longest single ETA.*
-- [ ] **Retry all failed.** One action that re-enqueues every entry in `src/main/errorlog.ts`.
+- [x] **Drag-and-drop a link or `.url` file onto the window.** *Done: the download card
-- [ ] **Duplicate detection.** Warn ("you already have this") when a URL/video-id is already in
+      (`DownloadBar.tsx`) handles `onDragOver`/`onDrop` with a dashed-outline drag highlight,
-      history or the active queue before enqueuing.
+      accepting `text/uri-list`/`text/plain` (`firstUrl`) and dropped Windows `.url`
-- [ ] **Per-download scheduling + "save for later."** YTDLnis lets you "schedule by date and
+      Internet-Shortcut files (`parseUrlFile`, read via `File.text()`); both http(s)-validated by
-      time" and park items. Add `scheduledFor?: number` + a `saved` state to `DownloadItem`;
+      the existing `looksLikeUrl`. A dropped link fills the URL field.*
-      `pump()` gains a time gate before promotion. Distinct from the existing background
+- [x] **Retry all failed.** One action that re-enqueues every failed item. *Done:
-      `--sync` schedule (Phase J), which is for *sources*, not one-off items.
+      `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
 

src/main/buildArgs.ts

@@ -161,6 +161,30 @@ export function selectExtraArgs(params: {
   return []
 }
 
+/**
+ * Parse a raw trim string (one or more time ranges, comma- or newline-separated)
+ * into yt-dlp `--download-sections` specs. Each range is normalised to the
+ * `*START-END` time-range form yt-dlp expects (the leading `*` distinguishes a
+ * timestamp range from a chapter-title regex). Tokens that don't look like a
+ * numeric time range are dropped, so malformed input can't reach yt-dlp's argv.
+ *
+ * Accepts H:MM:SS / M:SS / SS with optional fractional seconds, e.g. '1:30-2:00',
+ * '90-120', '0:00:10.5-0:00:20'. A token may already carry the leading `*`.
+ */
+export function parseTrimSections(raw: string | undefined): string[] {
+  if (!raw) return []
+  const TIME = String.raw`\d+(?::\d{1,2})*(?:\.\d+)?`
+  const RANGE = new RegExp(`^${TIME}-${TIME}$`)
+  const out: string[] = []
+  for (const piece of raw.split(/[,\n]/)) {
+    let t = piece.trim()
+    if (!t) continue
+    if (t.startsWith('*')) t = t.slice(1).trim()
+    if (RANGE.test(t)) out.push(`*${t}`)
+  }
+  return out
+}
+
 // Wrap a single argv token for human-readable display only (Phase C command
 // preview) — never used to build the real argv that gets spawned.
 function quoteForDisplay(arg: string): string {
@@ -250,17 +274,30 @@ function postProcessArgs(opts: StartDownloadOptions, o: DownloadOptions): string
   }
 
   // SponsorBlock.
+  let forcedKeyframes = false
   if (o.sponsorBlock && o.sponsorBlockCategories.length > 0) {
     const cats = o.sponsorBlockCategories.join(',')
     if (o.sponsorBlockMode === 'remove') {
       // Force keyframes at the cut points so segment boundaries are frame-accurate.
       args.push('--sponsorblock-remove', cats, '--force-keyframes-at-cuts')
+      forcedKeyframes = true
     } else {
       args.push('--sponsorblock-mark', cats)
     }
   }
 
+  // Trim — download only the given time ranges (works for video + audio). Force
+  // keyframes at the cut points for frame-accurate boundaries, unless
+  // SponsorBlock-remove already requested it (the flag is idempotent, but we
+  // avoid emitting it twice).
+  const sections = parseTrimSections(opts.trim)
+  for (const sec of sections) args.push('--download-sections', sec)
+  if (sections.length > 0 && !forcedKeyframes) args.push('--force-keyframes-at-cuts')
+
   if (o.embedChapters) args.push('--embed-chapters')
+  // Split into one file per chapter. yt-dlp also keeps the full file; the
+  // per-chapter files use yt-dlp's default `chapter:` output template.
+  if (o.splitChapters) args.push('--split-chapters')
   if (o.embedMetadata) args.push('--embed-metadata')
 
   // Media-server sidecar files (Phase K) — written next to the output file so

src/main/download.ts

@@ -38,6 +38,7 @@ import {
 interface ActiveDownload {
   child: ChildProcess
   canceled: boolean
+  paused: boolean
 }
 
 const active = new Map<string, ActiveDownload>()
@@ -295,7 +296,7 @@ export function startDownload(
     return { ok: false, error: (e as Error).message }
   }
 
-  const rec: ActiveDownload = { child, canceled: false }
+  const rec: ActiveDownload = { child, canceled: false, paused: false }
   active.set(opts.id, rec)
 
   // Title/channel/duration are kept locally so the completion notification and
@@ -344,7 +345,8 @@ export function startDownload(
     if (settled) return
     settled = true
     active.delete(opts.id)
-    if (!rec.canceled) {
+    // A paused download was killed on purpose — stay silent, like a cancel.
+    if (!rec.canceled && !rec.paused) {
       send(wc, { type: 'error', id: opts.id, error: err.message })
       logFailure(opts, resolvedTitle, err.message)
       notify(wc, resolvedTitle ?? 'Download failed', err.message)
@@ -355,7 +357,9 @@ export function startDownload(
     if (settled) return
     settled = true
     active.delete(opts.id)
-    if (rec.canceled) return // renderer already showed 'canceled' optimistically
+    // Canceled: renderer already showed 'canceled'. Paused: renderer showed
+    // 'paused' and keeps the .part for a later resume. Either way, no event.
+    if (rec.canceled || rec.paused) return
     if (code === 0) {
       send(wc, { type: 'done', id: opts.id, filePath })
       notify(wc, resolvedTitle ?? 'Download complete', 'Finished downloading.')
@@ -370,15 +374,12 @@ export function startDownload(
   return { ok: true }
 }
 
-export function cancelDownload(id: string): void {
+// Kill the whole process tree (/T) so the spawned ffmpeg child dies too. Resolve
-  const rec = active.get(id)
+// taskkill from System32 by absolute path, never the bare name, so a planted
-  if (!rec) return
+// taskkill.exe on PATH / in the CWD can't run in its place. (audit F3)
-  rec.canceled = true
+function killTree(rec: ActiveDownload): void {
   const pid = rec.child.pid
   if (pid != null) {
-    // Kill the whole tree (/T) so the spawned ffmpeg child dies too. Resolve
-    // taskkill from System32 by absolute path, never the bare name, so a planted
-    // taskkill.exe on PATH / in the CWD can't run in its place. (audit F3)
     execFile(
       getSystem32Path('taskkill.exe'),
       ['/pid', String(pid), '/T', '/F'],
@@ -389,3 +390,24 @@ export function cancelDownload(id: string): void {
     rec.child.kill()
   }
 }
+
+export function cancelDownload(id: string): void {
+  const rec = active.get(id)
+  if (!rec) return
+  rec.canceled = true
+  killTree(rec)
+}
+
+/**
+ * Pause a running download: kill the process tree but flag it `paused` (not
+ * `canceled`) so the close handler stays silent — no error event, no error log,
+ * no notification. yt-dlp leaves the partial `.part` file in place, so resuming
+ * is just a fresh startDownload with the same options: yt-dlp's default
+ * `--continue` picks the partial file back up.
+ */
+export function pauseDownload(id: string): void {
+  const rec = active.get(id)
+  if (!rec) return
+  rec.paused = true
+  killTree(rec)
+}

src/main/index.ts

@@ -14,7 +14,7 @@ import { getYtdlpVersion, updateYtdlp, runStartupYtdlpAutoUpdate } from './ytdlp
 import { getFfmpegVersions } from './ffmpeg'
 import { checkForAppUpdate, downloadAppUpdate, runAppUpdate } from './updater'
 import { probeMedia } from './probe'
-import { startDownload, cancelDownload, previewCommand } from './download'
+import { startDownload, cancelDownload, pauseDownload, previewCommand } from './download'
 import { getSettings, setSettings, ensureMediaDirs } from './settings'
 import { listHistory, addHistory, removeHistory, removeManyHistory, clearHistory } from './history'
 import { listTemplates, saveTemplate, removeTemplate } from './templates'
@@ -211,6 +211,7 @@ function registerIpcHandlers(): void {
     return result
   })
   ipcMain.handle(IpcChannels.downloadCancel, (_e, id: string) => cancelDownload(id))
+  ipcMain.handle(IpcChannels.downloadPause, (_e, id: string) => pauseDownload(id))
 
   ipcMain.handle(IpcChannels.defaultFolder, () => app.getPath('downloads'))
 

src/main/settings.ts

@@ -111,6 +111,7 @@ function sanitizeOptions(input: unknown): DownloadOptions {
     sponsorBlockMode: o.sponsorBlockMode === 'mark' ? 'mark' : 'remove',
     sponsorBlockCategories: cats,
     embedChapters: bool(o.embedChapters, d.embedChapters),
+    splitChapters: bool(o.splitChapters, d.splitChapters),
     embedMetadata: bool(o.embedMetadata, d.embedMetadata),
     embedThumbnail: bool(o.embedThumbnail, d.embedThumbnail),
     cropThumbnail: bool(o.cropThumbnail, d.cropThumbnail),

src/preload/index.ts

@@ -69,6 +69,9 @@ const api = {
   cancelDownload: (id: string): Promise<void> =>
     ipcRenderer.invoke(IpcChannels.downloadCancel, id),
 
+  pauseDownload: (id: string): Promise<void> =>
+    ipcRenderer.invoke(IpcChannels.downloadPause, id),
+
   getDefaultFolder: (): Promise<string> => ipcRenderer.invoke(IpcChannels.defaultFolder),
 
   chooseFolder: (): Promise<string | null> => ipcRenderer.invoke(IpcChannels.chooseFolder),

src/renderer/src/components/DownloadBar.tsx

@@ -1,6 +1,8 @@
 import { useState, useEffect, useRef } from 'react'
 import {
   Input,
+  Textarea,
+  Field,
   Button,
   Checkbox,
   Spinner,
@@ -20,10 +22,14 @@ import {
   ErrorCircleRegular,
   LinkRegular,
   DismissRegular,
-  AppsListRegular
+  AppsListRegular,
+  CutRegular,
+  CalendarClockRegular,
+  WarningRegular
 } from '@fluentui/react-icons'
 import type { MediaInfo, FormatOption, PlaylistInfo } from '@shared/ipc'
 import { useDownloads, QUALITY_OPTIONS, type MediaKind } from '../store/downloads'
+import { sameVideo } from '../store/queueStats'
 import { useSettings } from '../store/settings'
 import { Select } from './Select'
 import { Hint } from './Hint'
@@ -40,6 +46,23 @@ function looksLikeUrl(text: string): boolean {
   }
 }
 
+/** First http(s) URL in a blob of dropped text (one per line; '#' comments skipped). */
+function firstUrl(text: string): string | null {
+  for (const raw of text.split(/\r?\n/)) {
+    const line = raw.trim()
+    if (!line || line.startsWith('#')) continue
+    if (looksLikeUrl(line)) return line
+  }
+  return null
+}
+
+/** Pull the URL= target out of a dropped Windows .url Internet Shortcut file. */
+function parseUrlFile(content: string): string | null {
+  const m = /^\s*URL\s*=\s*(\S+)/im.exec(content)
+  const url = m?.[1]?.trim()
+  return url && looksLikeUrl(url) ? url : null
+}
+
 const useStyles = makeStyles({
   root: {
     display: 'flex',
@@ -50,6 +73,11 @@ const useStyles = makeStyles({
     ...shorthands.borderRadius(tokens.borderRadiusXLarge),
     boxShadow: tokens.shadow4
   },
+  // Highlight while a link / .url file is dragged over the card.
+  rootDragging: {
+    outline: `2px dashed ${tokens.colorBrandStroke1}`,
+    outlineOffset: '-2px'
+  },
   urlRow: {
     display: 'flex',
     gap: '8px'
@@ -212,6 +240,45 @@ const useStyles = makeStyles({
   },
   plItemMeta: {
     color: tokens.colorNeutralForeground3
+  },
+  // --- duplicate warning ---
+  dupRow: {
+    display: 'flex',
+    alignItems: 'center',
+    gap: '8px',
+    padding: '8px 8px 8px 12px',
+    backgroundColor: tokens.colorStatusWarningBackground1,
+    color: tokens.colorStatusWarningForeground1,
+    ...shorthands.borderRadius(tokens.borderRadiusLarge)
+  },
+  // --- trim / schedule panels ---
+  trimBlock: {
+    display: 'flex',
+    flexDirection: 'column',
+    gap: '8px',
+    alignItems: 'flex-start'
+  },
+  optButtons: {
+    display: 'flex',
+    gap: '8px'
+  },
+  trimPanel: {
+    alignSelf: 'stretch',
+    padding: '12px',
+    backgroundColor: tokens.colorNeutralBackground2,
+    ...shorthands.borderRadius(tokens.borderRadiusLarge),
+    border: `1px solid ${tokens.colorNeutralStroke2}`
+  },
+  // Native datetime-local input, themed to sit beside the Fluent controls.
+  dtInput: {
+    fontFamily: tokens.fontFamilyBase,
+    fontSize: tokens.fontSizeBase300,
+    padding: '6px 10px',
+    ...shorthands.borderRadius(tokens.borderRadiusMedium),
+    border: `1px solid ${tokens.colorNeutralStroke1}`,
+    backgroundColor: tokens.colorNeutralBackground1,
+    color: tokens.colorNeutralForeground1,
+    colorScheme: 'light dark'
   }
 })
 
@@ -227,6 +294,47 @@ export function DownloadBar(): React.JSX.Element {
   const [kind, setKind] = useState<MediaKind>('video')
   const [quality, setQuality] = useState(QUALITY_OPTIONS.video[0])
 
+  // Optional trim: keep only certain time ranges. Raw text, normalised in main.
+  const [showTrim, setShowTrim] = useState(false)
+  const [trim, setTrim] = useState('')
+
+  // Optional schedule: a datetime-local value; a future time parks the download.
+  const [showSchedule, setShowSchedule] = useState(false)
+  const [scheduleAt, setScheduleAt] = useState('')
+
+  // Drag-and-drop: highlight while a link / .url file hovers the card.
+  const [dragActive, setDragActive] = useState(false)
+
+  // Duplicate guard: warn before enqueuing a URL already in the active queue.
+  const [dup, setDup] = useState<string | null>(null)
+  const confirmDup = useRef(false)
+
+  function onDragOver(e: React.DragEvent): void {
+    e.preventDefault()
+    if (!dragActive) setDragActive(true)
+  }
+  function onDrop(e: React.DragEvent): void {
+    e.preventDefault()
+    setDragActive(false)
+    const dt = e.dataTransfer
+    const fromText = firstUrl(dt.getData('text/uri-list') || dt.getData('text/plain') || '')
+    if (fromText) {
+      onUrlChange(fromText)
+      return
+    }
+    // A dropped Windows .url Internet Shortcut — read its URL= line.
+    const file = Array.from(dt.files).find((f) => f.name.toLowerCase().endsWith('.url'))
+    if (file) {
+      file
+        .text()
+        .then((content) => {
+          const u = parseUrlFile(content)
+          if (u) onUrlChange(u)
+        })
+        .catch(() => {})
+    }
+  }
+
   // Apply the saved default format once, when persisted settings first arrive.
   const appliedDefaults = useRef(false)
   useEffect(() => {
@@ -320,8 +428,10 @@ export function DownloadBar(): React.JSX.Element {
 
   function onUrlChange(next: string): void {
     setUrl(next)
-    // Any probed info is stale once the URL changes.
+    // Any probed info — or a duplicate warning — is stale once the URL changes.
     if (info || probeError || playlist) clearProbe()
+    if (dup) setDup(null)
+    confirmDup.current = false
   }
 
   function onKindChange(next: MediaKind): void {
@@ -383,6 +493,23 @@ export function DownloadBar(): React.JSX.Element {
     const trimmed = url.trim()
     if (!trimmed) return
 
+    // Duplicate guard: if this URL is already in the queue (and the user hasn't
+    // confirmed via "Download anyway"), warn instead of silently enqueuing a copy.
+    // Canceled/failed items don't count — re-adding those is a legitimate retry.
+    if (!confirmDup.current) {
+      const existing = useDownloads
+        .getState()
+        .items.find(
+          (i) => i.status !== 'canceled' && i.status !== 'error' && sameVideo(i.url, trimmed)
+        )
+      if (existing) {
+        setDup(existing.title)
+        return
+      }
+    }
+    confirmDup.current = false
+    setDup(null)
+
     const meta = info
       ? {
           title: info.title,
@@ -392,9 +519,14 @@ export function DownloadBar(): React.JSX.Element {
         }
       : {}
 
+    const trimSpec = trim.trim() || undefined
+    const scheduledFor = scheduleAt ? new Date(scheduleAt).getTime() : undefined
+
     if (usingFormats && selectedFormat) {
       addFromUrl(trimmed, 'video', selectedFormat.label, {
         ...meta,
+        trim: trimSpec,
+        scheduledFor,
         format: {
           id: selectedFormat.id,
           hasAudio: selectedFormat.hasAudio,
@@ -402,13 +534,22 @@ export function DownloadBar(): React.JSX.Element {
         }
       })
     } else {
-      addFromUrl(trimmed, kind, quality, meta)
+      addFromUrl(trimmed, kind, quality, { ...meta, trim: trimSpec, scheduledFor })
     }
 
     setUrl('')
+    setTrim('')
+    setShowTrim(false)
+    setScheduleAt('')
+    setShowSchedule(false)
     clearProbe()
   }
 
+  function downloadAnyway(): void {
+    confirmDup.current = true
+    download()
+  }
+
   function addPlaylist(): void {
     if (!playlist) return
     const chosen = playlist.entries.filter((e) => selected.has(e.index))
@@ -424,7 +565,12 @@ export function DownloadBar(): React.JSX.Element {
   }
 
   return (
-    <div className={styles.root}>
+    <div
+      className={mergeClasses(styles.root, dragActive && styles.rootDragging)}
+      onDragOver={onDragOver}
+      onDragLeave={() => setDragActive(false)}
+      onDrop={onDrop}
+    >
       <div className={styles.urlRow}>
         <Input
           className={styles.url}
@@ -474,6 +620,23 @@ export function DownloadBar(): React.JSX.Element {
         </div>
       )}
 
+      {dup && (
+        <div className={styles.dupRow}>
+          <WarningRegular />
+          <Caption1 className={styles.suggestionText}>Already in your queue: “{dup}”.</Caption1>
+          <Button size="small" appearance="primary" onClick={downloadAnyway}>
+            Download anyway
+          </Button>
+          <Button
+            size="small"
+            appearance="subtle"
+            icon={<DismissRegular />}
+            onClick={() => setDup(null)}
+            aria-label="Dismiss"
+          />
+        </div>
+      )}
+
       {probing && (
         <div className={styles.statusRow}>
           <Spinner size="tiny" />
@@ -550,6 +713,59 @@ export function DownloadBar(): React.JSX.Element {
         </div>
       )}
 
+      {!playlist && (
+        <div className={styles.trimBlock}>
+          <div className={styles.optButtons}>
+            <Button
+              size="small"
+              appearance="subtle"
+              icon={<CutRegular />}
+              onClick={() => setShowTrim((v) => !v)}
+            >
+              {trim.trim() ? 'Trim · on' : 'Trim'}
+            </Button>
+            <Button
+              size="small"
+              appearance="subtle"
+              icon={<CalendarClockRegular />}
+              onClick={() => setShowSchedule((v) => !v)}
+            >
+              {scheduleAt ? 'Scheduled' : 'Schedule'}
+            </Button>
+          </div>
+          {showTrim && (
+            <div className={styles.trimPanel}>
+              <Field
+                label="Sections to keep"
+                hint="Time ranges like 1:30-2:00 — one per line or comma-separated. Leave empty to download the whole thing."
+              >
+                <Textarea
+                  value={trim}
+                  onChange={(_, d) => setTrim(d.value)}
+                  placeholder={'0:30-1:45\n3:00-3:30'}
+                  resize="vertical"
+                />
+              </Field>
+            </div>
+          )}
+          {showSchedule && (
+            <div className={styles.trimPanel}>
+              <Field
+                label="Start at"
+                hint="Pick a date and time to start this download. Leave empty to start now. Scheduled downloads only fire while AeroFetch is running."
+              >
+                <input
+                  type="datetime-local"
+                  className={styles.dtInput}
+                  value={scheduleAt}
+                  onChange={(e) => setScheduleAt(e.target.value)}
+                />
+              </Field>
+            </div>
+          )}
+        </div>
+      )}
+
       <div className={styles.controls}>
         <div className={styles.control}>
           <Caption1>Format</Caption1>
@@ -606,11 +822,11 @@ export function DownloadBar(): React.JSX.Element {
           <Button
             appearance="primary"
             size="large"
-            icon={<ArrowDownloadRegular />}
+            icon={scheduleAt ? <CalendarClockRegular /> : <ArrowDownloadRegular />}
             onClick={download}
             disabled={!url.trim()}
           >
-            Download
+            {scheduleAt ? 'Schedule' : 'Download'}
           </Button>
         )}
       </div>

src/renderer/src/components/DownloadOptionsForm.tsx

@@ -204,6 +204,16 @@ export function DownloadOptionsForm({ value, onChange }: Props): React.JSX.Eleme
           label={value.embedChapters ? 'On' : 'Off'}
         />
       </Field>
+      <Field
+        label="Split by chapters"
+        hint="Also save each chapter as its own file. The full-length file is kept too."
+      >
+        <Switch
+          checked={value.splitChapters}
+          onChange={(_, d) => setOpt('splitChapters', d.checked)}
+          label={value.splitChapters ? 'On' : 'Off'}
+        />
+      </Field>
       <Field label="Embed metadata" hint="Title, artist, date and similar tags.">
         <Switch
           checked={value.embedMetadata}

src/renderer/src/components/DownloadsView.tsx

@@ -1,12 +1,16 @@
 import {
   Subtitle2,
   Body1,
+  Caption1,
   Button,
+  ProgressBar,
   makeStyles,
-  tokens
+  tokens,
+  shorthands
 } from '@fluentui/react-components'
-import { ArrowDownloadRegular } from '@fluentui/react-icons'
+import { ArrowDownloadRegular, ArrowClockwiseRegular } from '@fluentui/react-icons'
 import { useDownloads } from '../store/downloads'
+import { summarizeQueue } from '../store/queueStats'
 import { DownloadBar } from './DownloadBar'
 import { QueueItem } from './QueueItem'
 import { VirtualList } from './VirtualList'
@@ -26,6 +30,27 @@ const useStyles = makeStyles({
     alignItems: 'center',
     justifyContent: 'space-between'
   },
+  headerActions: {
+    display: 'flex',
+    gap: '8px'
+  },
+  summary: {
+    display: 'flex',
+    alignItems: 'center',
+    gap: '12px',
+    padding: '10px 14px',
+    backgroundColor: tokens.colorNeutralBackground1,
+    ...shorthands.borderRadius(tokens.borderRadiusLarge),
+    border: `1px solid ${tokens.colorNeutralStroke2}`
+  },
+  summaryBar: {
+    flexGrow: 1
+  },
+  summaryText: {
+    flexShrink: 0,
+    color: tokens.colorNeutralForeground3,
+    whiteSpace: 'nowrap'
+  },
   listScroll: {
     flexGrow: 1,
     // min-height:0 lets this flex child shrink below its content height so it,
@@ -47,7 +72,9 @@ export function DownloadsView(): React.JSX.Element {
   const styles = useStyles()
   const items = useDownloads((s) => s.items)
   const clearFinished = useDownloads((s) => s.clearFinished)
+  const retryAll = useDownloads((s) => s.retryAll)
 
+  const summary = summarizeQueue(items)
   const hasFinished = items.some(
     (i) => i.status === 'completed' || i.status === 'error' || i.status === 'canceled'
   )
@@ -56,13 +83,37 @@ export function DownloadsView(): React.JSX.Element {
     <div className={styles.root}>
       <DownloadBar />
 
+      {summary.active && (
+        <div className={styles.summary}>
+          <ProgressBar className={styles.summaryBar} value={summary.progress} thickness="large" />
+          <Caption1 className={styles.summaryText}>
+            {summary.downloading} downloading
+            {summary.queued ? `, ${summary.queued} queued` : ''}
+            {summary.speedLabel ? `  •  ${summary.speedLabel}` : ''}
+            {summary.etaLabel ? `  •  ~${summary.etaLabel} left` : ''}
+          </Caption1>
+        </div>
+      )}
+
       <div className={styles.queueHeader}>
         <Subtitle2>Queue ({items.length})</Subtitle2>
-        {hasFinished && (
+        <div className={styles.headerActions}>
-          <Button size="small" appearance="subtle" onClick={clearFinished}>
+          {summary.failed > 0 && (
-            Clear finished
+            <Button
-          </Button>
+              size="small"
-        )}
+              appearance="subtle"
+              icon={<ArrowClockwiseRegular />}
+              onClick={retryAll}
+            >
+              Retry all failed ({summary.failed})
+            </Button>
+          )}
+          {hasFinished && (
+            <Button size="small" appearance="subtle" onClick={clearFinished}>
+              Clear finished
+            </Button>
+          )}
+        </div>
       </div>
 
       {items.length === 0 ? (

src/renderer/src/components/LibraryView.tsx

@@ -57,6 +57,8 @@ const STATUS_LABEL: Record<ItemStatus, string> = {
   pending: 'Pending',
   queued: 'Queued',
   downloading: 'Downloading',
+  paused: 'Paused',
+  saved: 'Saved',
   completed: 'Downloaded',
   error: 'Failed',
   canceled: 'Canceled'

src/renderer/src/components/QueueItem.tsx

@@ -16,6 +16,11 @@ import {
   OpenRegular,
   FolderRegular,
   ArrowClockwiseRegular,
+  ArrowDownloadRegular,
+  ArrowUpRegular,
+  BookmarkRegular,
+  PauseRegular,
+  PlayRegular,
   CheckmarkCircleFilled,
   ErrorCircleFilled,
   EyeOffRegular
@@ -91,6 +96,8 @@ const useStyles = makeStyles({
 const STATUS_BADGE: Record<DownloadStatus, { label: string; color: 'brand' | 'success' | 'danger' | 'warning' | 'subtle' }> = {
   queued: { label: 'Queued', color: 'subtle' },
   downloading: { label: 'Downloading', color: 'brand' },
+  paused: { label: 'Paused', color: 'warning' },
+  saved: { label: 'Saved', color: 'subtle' },
   completed: { label: 'Completed', color: 'success' },
   error: { label: 'Failed', color: 'danger' },
   canceled: { label: 'Canceled', color: 'warning' }
@@ -100,6 +107,14 @@ function pct(progress: number): string {
   return `${Math.round(progress * 100)}%`
 }
 
+function fmtSchedule(ms: number): string {
+  try {
+    return new Date(ms).toLocaleString([], { dateStyle: 'medium', timeStyle: 'short' })
+  } catch {
+    return ''
+  }
+}
+
 export const QueueItem = memo(function QueueItem({
   item
 }: {
@@ -107,6 +122,11 @@ export const QueueItem = memo(function QueueItem({
 }): React.JSX.Element {
   const styles = useStyles()
   const cancel = useDownloads((s) => s.cancel)
+  const pause = useDownloads((s) => s.pause)
+  const resume = useDownloads((s) => s.resume)
+  const prioritize = useDownloads((s) => s.prioritize)
+  const saveForLater = useDownloads((s) => s.saveForLater)
+  const queueNow = useDownloads((s) => s.queueNow)
   const remove = useDownloads((s) => s.remove)
   const retry = useDownloads((s) => s.retry)
   const openFile = useDownloads((s) => s.openFile)
@@ -177,12 +197,79 @@ export const QueueItem = memo(function QueueItem({
           </div>
         )}
 
+        {item.status === 'paused' && (
+          <div className={styles.progressRow}>
+            <ProgressBar className={styles.progressBar} value={item.progress} thickness="large" />
+            <Caption1 className={styles.stats}>Paused • {pct(item.progress)}</Caption1>
+          </div>
+        )}
+
+        {item.status === 'saved' && (
+          <Caption1 className={styles.stats}>
+            {item.scheduledFor ? `Scheduled for ${fmtSchedule(item.scheduledFor)}` : 'Saved for later'}
+          </Caption1>
+        )}
+
         {item.status === 'error' && item.error && (
           <Caption1 className={styles.error}>{item.error}</Caption1>
         )}
       </div>
 
       <div className={styles.actions}>
+        {item.status === 'downloading' && (
+          <Hint label="Pause" placement="top" align="end">
+            <Button
+              appearance="subtle"
+              icon={<PauseRegular />}
+              onClick={() => pause(item.id)}
+              aria-label="Pause"
+            />
+          </Hint>
+        )}
+
+        {item.status === 'queued' && (
+          <>
+            <Hint label="Download next" placement="top" align="end">
+              <Button
+                appearance="subtle"
+                icon={<ArrowUpRegular />}
+                onClick={() => prioritize(item.id)}
+                aria-label="Download next"
+              />
+            </Hint>
+            <Hint label="Save for later" placement="top" align="end">
+              <Button
+                appearance="subtle"
+                icon={<BookmarkRegular />}
+                onClick={() => saveForLater(item.id)}
+                aria-label="Save for later"
+              />
+            </Hint>
+          </>
+        )}
+
+        {item.status === 'paused' && (
+          <Hint label="Resume" placement="top" align="end">
+            <Button
+              appearance="subtle"
+              icon={<PlayRegular />}
+              onClick={() => resume(item.id)}
+              aria-label="Resume"
+            />
+          </Hint>
+        )}
+
+        {item.status === 'saved' && (
+          <Hint label="Add to queue" placement="top" align="end">
+            <Button
+              appearance="subtle"
+              icon={<ArrowDownloadRegular />}
+              onClick={() => queueNow(item.id)}
+              aria-label="Add to queue"
+            />
+          </Hint>
+        )}
+
         {active && (
           <Hint label="Cancel" placement="top" align="end">
             <Button

src/renderer/src/main.tsx

@@ -113,6 +113,7 @@ if (import.meta.env.DEV && !window.api) {
     },
     startDownload: async () => ({ ok: true }),
     cancelDownload: async () => {},
+    pauseDownload: async () => {},
     getDefaultFolder: async () => 'C:\\Users\\you\\Downloads',
     chooseFolder: async () => null,
     openPath: async () => '',

src/renderer/src/store/downloads.ts

@@ -6,7 +6,14 @@ import { useSources } from './sources'
 
 export type MediaKind = 'video' | 'audio'
 
-export type DownloadStatus = 'queued' | 'downloading' | 'completed' | 'error' | 'canceled'
+export type DownloadStatus =
+  | 'queued'
+  | 'downloading'
+  | 'paused'
+  | 'saved'
+  | 'completed'
+  | 'error'
+  | 'canceled'
 
 /** An exact probed format chosen for a download (omitted for the preset path). */
 export interface ChosenFormat {
@@ -39,6 +46,10 @@ export interface DownloadItem {
   options?: DownloadOptions
   /** per-download custom-command override (omitted = use the persisted default template) */
   extraArgs?: string
+  /** raw trim spec — time ranges to keep (parsed to --download-sections in main) */
+  trim?: string
+  /** epoch ms to auto-start a 'saved' item; undefined = parked indefinitely (Phase M) */
+  scheduledFor?: number
   /** private download — completion is never recorded to history */
   incognito?: boolean
   /** metadata already fetched at probe time; forwarded to main so it skips a redundant probe */
@@ -63,6 +74,9 @@ export interface AddOptions {
   thumbnail?: string
   options?: DownloadOptions
   extraArgs?: string
+  trim?: string
+  /** when set and in the future, the item starts 'saved' and auto-queues at this time */
+  scheduledFor?: number
   incognito?: boolean
   collection?: CollectionContext
   mediaItemId?: string
@@ -90,6 +104,20 @@ interface DownloadState {
    */
   addMany: (entries: AddEntry[]) => void
   retry: (id: string) => void
+  /** re-queue every failed item at once (Phase M) */
+  retryAll: () => void
+  /** stop a running download but keep its partial file for a later resume (Phase M) */
+  pause: (id: string) => void
+  /** re-queue a paused download; yt-dlp continues its partial file on relaunch */
+  resume: (id: string) => void
+  /** move a queued item to the front of the promotion order ("download next", Phase M) */
+  prioritize: (id: string) => void
+  /** park a queued item indefinitely as 'saved' (Phase M) */
+  saveForLater: (id: string) => void
+  /** un-park a 'saved' item back into the queue now (clears any schedule) */
+  queueNow: (id: string) => void
+  /** internal: promote any 'saved' item whose scheduledFor time has arrived */
+  promoteDueScheduled: () => void
   cancel: (id: string) => void
   remove: (id: string) => void
   clearFinished: () => void
@@ -117,6 +145,10 @@ function buildItem(url: string, kind: MediaKind, quality: string, opts?: AddOpti
     opts?.title || opts?.channel || opts?.durationLabel
       ? { title: opts?.title, channel: opts?.channel, durationLabel: opts?.durationLabel }
       : undefined
+  // A future scheduled time parks the item as 'saved' until its moment arrives;
+  // a past/absent time starts it queued as usual.
+  const scheduledFor =
+    opts?.scheduledFor && opts.scheduledFor > Date.now() ? opts.scheduledFor : undefined
   return {
     id: newId(),
     url,
@@ -126,12 +158,14 @@ function buildItem(url: string, kind: MediaKind, quality: string, opts?: AddOpti
     thumbnail: opts?.thumbnail,
     kind,
     quality,
-    status: 'queued',
+    status: scheduledFor ? 'saved' : 'queued',
     progress: 0,
     formatId: opts?.format?.id,
     formatHasAudio: opts?.format?.hasAudio,
     options: opts?.options,
     extraArgs: opts?.extraArgs,
+    trim: opts?.trim,
+    scheduledFor,
     incognito: opts?.incognito,
     collection: opts?.collection,
     mediaItemId: opts?.mediaItemId,
@@ -297,6 +331,7 @@ export const useDownloads = create<DownloadState>((set, get) => {
         formatHasAudio: item.formatHasAudio,
         options: item.options,
         extraArgs: item.extraArgs,
+        trim: item.trim,
         meta: item.probedMeta,
         collection: item.collection
       })
@@ -357,6 +392,93 @@ export const useDownloads = create<DownloadState>((set, get) => {
       pump()
     },
 
+    retryAll: () => {
+      set((s) => ({
+        items: s.items.map((i) =>
+          i.status === 'error'
+            ? { ...i, status: 'queued', progress: 0, error: undefined, speed: undefined, eta: undefined }
+            : i
+        )
+      }))
+      pump()
+    },
+
+    pause: (id) => {
+      const cur = get().items.find((i) => i.id === id)
+      if (!cur) return
+      // Only a running download has a live process to stop; a queued item is
+      // just parked in place. Either way it becomes 'paused' (pump ignores it).
+      if (!PREVIEW && cur.status === 'downloading') window.api.pauseDownload(id).catch(() => {})
+      set((s) => ({
+        items: s.items.map((i) =>
+          i.id === id && (i.status === 'downloading' || i.status === 'queued')
+            ? { ...i, status: 'paused', speed: undefined, eta: undefined }
+            : i
+        )
+      }))
+      pump() // pausing a running item frees a slot
+    },
+
+    resume: (id) => {
+      // Re-queue WITHOUT resetting progress (unlike retry): pump() promotes it and
+      // launchItem re-spawns yt-dlp, which continues the partial file by default.
+      set((s) => ({
+        items: s.items.map((i) =>
+          i.id === id && i.status === 'paused' ? { ...i, status: 'queued' } : i
+        )
+      }))
+      pump()
+    },
+
+    prioritize: (id) => {
+      // Reposition the item so pump() — which promotes the highest-index queued
+      // item first (oldest-first over a newest-first array) — picks it next.
+      set((s) => {
+        const idx = s.items.findIndex((i) => i.id === id)
+        if (idx < 0 || s.items[idx].status !== 'queued') return {}
+        const items = s.items.slice()
+        const [it] = items.splice(idx, 1)
+        let after = -1
+        for (let k = 0; k < items.length; k++) if (items[k].status === 'queued') after = k
+        items.splice(after + 1, 0, it)
+        return { items }
+      })
+      pump()
+    },
+
+    saveForLater: (id) => {
+      set((s) => ({
+        items: s.items.map((i) =>
+          i.id === id && i.status === 'queued'
+            ? { ...i, status: 'saved', scheduledFor: undefined }
+            : i
+        )
+      }))
+    },
+
+    queueNow: (id) => {
+      set((s) => ({
+        items: s.items.map((i) =>
+          i.id === id && i.status === 'saved'
+            ? { ...i, status: 'queued', scheduledFor: undefined }
+            : i
+        )
+      }))
+      pump()
+    },
+
+    promoteDueScheduled: () => {
+      const now = Date.now()
+      set((s) => ({
+        items: s.items.map((i) =>
+          i.status === 'saved' && i.scheduledFor != null && i.scheduledFor <= now
+            ? { ...i, status: 'queued', scheduledFor: undefined }
+            : i
+        )
+      }))
+      pump()
+    },
+
     cancel: (id) => {
       const cur = get().items.find((i) => i.id === id)
       if (!cur) return
@@ -379,7 +501,13 @@ export const useDownloads = create<DownloadState>((set, get) => {
 
     clearFinished: () =>
       set((s) => ({
-        items: s.items.filter((i) => i.status === 'downloading' || i.status === 'queued')
+        items: s.items.filter(
+          (i) =>
+            i.status === 'downloading' ||
+            i.status === 'queued' ||
+            i.status === 'paused' ||
+            i.status === 'saved'
+        )
       })),
 
     openFile: (id) => {
@@ -461,6 +589,17 @@ export const useDownloads = create<DownloadState>((set, get) => {
   }
 })
 
+// Promote scheduled ('saved' + a due scheduledFor) items when their time arrives.
+// Session-only: the queue isn't persisted, so a schedule only fires while the app
+// runs (noted in ROADMAP.md). A 15s tick is plenty for minute-granularity times.
+setInterval(() => {
+  const st = useDownloads.getState()
+  const now = Date.now()
+  if (st.items.some((i) => i.status === 'saved' && i.scheduledFor != null && i.scheduledFor <= now)) {
+    st.promoteDueScheduled()
+  }
+}, 15_000)
+
 // Wire main → renderer push events. (Output folder + cap live in the settings store.)
 if (!PREVIEW) {
   window.api.onDownloadEvent((ev) => useDownloads.getState().applyEvent(ev))

src/renderer/src/store/queueStats.ts

@@ -0,0 +1,139 @@
+/**
+ * Pure helpers for the Downloads view (Phase M): a one-line aggregate of the live
+ * queue, and same-video detection for the duplicate guard. Kept free of any store
+ * / window dependency (only a type-only import of DownloadItem) so it can be
+ * unit-tested without constructing the Zustand store or its preview ticker.
+ */
+import type { DownloadItem } from './downloads'
+
+// Parse a human speed string ('4.7 MB/s', '512 KiB/s') into bytes/second. Tolerant
+// of the SI (KB) and binary (KiB) suffixes yt-dlp may emit; the 1000-vs-1024
+// difference is immaterial for a live display estimate.
+function parseSpeed(s?: string): number {
+  if (!s) return 0
+  const m = /([\d.]+)\s*([KMGT]?)i?B\/s/i.exec(s)
+  if (!m) return 0
+  const n = parseFloat(m[1])
+  if (!isFinite(n)) return 0
+  const mult: Record<string, number> = { '': 1, K: 1e3, M: 1e6, G: 1e9, T: 1e12 }
+  return n * (mult[m[2].toUpperCase()] ?? 1)
+}
+
+function formatSpeed(bytesPerSec: number): string {
+  if (bytesPerSec <= 0) return ''
+  const units = ['B/s', 'KB/s', 'MB/s', 'GB/s']
+  let v = bytesPerSec
+  let i = 0
+  while (v >= 1000 && i < units.length - 1) {
+    v /= 1000
+    i++
+  }
+  return `${v.toFixed(1)} ${units[i]}`
+}
+
+// Parse 'M:SS' / 'H:MM:SS' (or bare seconds) into seconds.
+function parseEtaSeconds(s?: string): number {
+  if (!s) return 0
+  const parts = s.split(':').map((p) => Number(p))
+  if (parts.length === 0 || parts.some((p) => !isFinite(p))) return 0
+  return parts.reduce((acc, p) => acc * 60 + p, 0)
+}
+
+function formatEta(totalSeconds: number): string {
+  if (totalSeconds <= 0) return ''
+  const s = Math.round(totalSeconds)
+  const m = Math.floor(s / 60)
+  return `${m}:${String(s % 60).padStart(2, '0')}`
+}
+
+export interface QueueSummary {
+  downloading: number
+  queued: number
+  failed: number
+  /** true when something is downloading or waiting */
+  active: boolean
+  /** 0..1, averaged over downloading + queued items */
+  progress: number
+  /** combined download speed, formatted; '' when nothing is downloading */
+  speedLabel: string
+  /** rough time remaining (the longest active ETA), formatted; '' when unknown */
+  etaLabel: string
+}
+
+/**
+ * Aggregate the live queue into a one-line summary for the Downloads header.
+ * Combined speed is summed across downloading items; the "time left" is the
+ * longest single ETA — a reasonable proxy for when the current batch finishes
+ * (we don't track remaining bytes, so a true combined ETA isn't available).
+ * Queued items count toward the progress average as 0%, so the bar reflects
+ * "how much of the visible work is done", not just the active downloads.
+ */
+export function summarizeQueue(items: DownloadItem[]): QueueSummary {
+  let downloading = 0
+  let queued = 0
+  let failed = 0
+  let progressSum = 0
+  let progressCount = 0
+  let speed = 0
+  let maxEta = 0
+  for (const i of items) {
+    if (i.status === 'downloading') {
+      downloading++
+      progressSum += i.progress
+      progressCount++
+      speed += parseSpeed(i.speed)
+      maxEta = Math.max(maxEta, parseEtaSeconds(i.eta))
+    } else if (i.status === 'queued') {
+      queued++
+      progressCount++
+    } else if (i.status === 'error') {
+      failed++
+    }
+  }
+  return {
+    downloading,
+    queued,
+    failed,
+    active: downloading > 0 || queued > 0,
+    progress: progressCount > 0 ? progressSum / progressCount : 0,
+    speedLabel: formatSpeed(speed),
+    etaLabel: formatEta(maxEta)
+  }
+}
+
+// --- Duplicate detection ----------------------------------------------------
+
+function youtubeId(url: string): string | null {
+  try {
+    const u = new URL(url)
+    const host = u.hostname.replace(/^www\./, '')
+    if (host === 'youtu.be') return u.pathname.slice(1) || null
+    if (host.endsWith('youtube.com')) return u.searchParams.get('v')
+  } catch {
+    /* not a URL */
+  }
+  return null
+}
+
+function normalizeUrl(url: string): string {
+  try {
+    const u = new URL(url)
+    const host = u.hostname.replace(/^www\./, '').toLowerCase()
+    return `${u.protocol}//${host}${u.pathname.replace(/\/$/, '')}${u.search}`
+  } catch {
+    return url.trim()
+  }
+}
+
+/**
+ * True when two URLs point at the same video: a matching YouTube id when both
+ * are YouTube links, otherwise normalised-URL equality (host lower-cased, `www.`
+ * and a trailing slash stripped). Powers the "already in your queue" guard.
+ */
+export function sameVideo(a: string, b: string): boolean {
+  if (a === b) return true
+  const ya = youtubeId(a)
+  const yb = youtubeId(b)
+  if (ya && yb) return ya === yb
+  return normalizeUrl(a) === normalizeUrl(b)
+}

src/shared/ipc.ts

@@ -19,6 +19,7 @@ export const IpcChannels = {
   probe: 'media:probe',
   downloadStart: 'download:start',
   downloadCancel: 'download:cancel',
+  downloadPause: 'download:pause',
   defaultFolder: 'download:default-folder',
   chooseFolder: 'download:choose-folder',
   openPath: 'shell:open-path',
@@ -158,6 +159,8 @@ export interface DownloadOptions {
   sponsorBlockCategories: SponsorBlockCategory[]
   /** embed chapter markers */
   embedChapters: boolean
+  /** split the download into one file per chapter (--split-chapters) */
+  splitChapters: boolean
   /** embed metadata (title/artist/etc.) */
   embedMetadata: boolean
   /** embed the thumbnail (cover art for audio, poster for mp4/mkv video) */
@@ -183,6 +186,7 @@ export const DEFAULT_DOWNLOAD_OPTIONS: DownloadOptions = {
   sponsorBlockMode: 'remove',
   sponsorBlockCategories: ['sponsor'],
   embedChapters: false,
+  splitChapters: false,
   embedMetadata: true,
   embedThumbnail: true,
   cropThumbnail: false,
@@ -389,6 +393,13 @@ export interface StartDownloadOptions {
    * download even when the settings default is enabled.
    */
   extraArgs?: string
+  /**
+   * Optional trim: keep only these time ranges. Raw user text — ranges like
+   * '1:30-2:00', comma- or newline-separated — normalised to yt-dlp
+   * `--download-sections` specs in buildArgs (parseTrimSections). Empty or
+   * undefined downloads the whole media.
+   */
+  trim?: string
   /**
    * Metadata the renderer already fetched when probing the URL (title/channel/
    * duration). When present, main uses it directly instead of spawning a second

test/buildArgs.test.ts

@@ -2,6 +2,7 @@ import { describe, it, expect } from 'vitest'
 import {
   buildArgs,
   parseExtraArgs,
+  parseTrimSections,
   selectExtraArgs,
   formatCommandLine,
   sanitizeDirSegment,
@@ -460,6 +461,71 @@ describe('sidecar files', () => {
   })
 })
 
+describe('chapters', () => {
+  it('emits --split-chapters when splitChapters is on', () => {
+    expect(build(opts(), dlo({ splitChapters: true }))).toContain('--split-chapters')
+  })
+
+  it('does not emit --split-chapters by default', () => {
+    expect(build(opts(), dlo())).not.toContain('--split-chapters')
+  })
+
+  it('emits --split-chapters independently of --embed-chapters', () => {
+    const argv = build(opts(), dlo({ splitChapters: true, embedChapters: false }))
+    expect(argv).toContain('--split-chapters')
+    expect(argv).not.toContain('--embed-chapters')
+  })
+})
+
+describe('parseTrimSections', () => {
+  it('normalises plain time ranges to *START-END specs', () => {
+    expect(parseTrimSections('1:30-2:00')).toEqual(['*1:30-2:00'])
+    expect(parseTrimSections('90-120')).toEqual(['*90-120'])
+    expect(parseTrimSections('0:00:10.5-0:00:20')).toEqual(['*0:00:10.5-0:00:20'])
+  })
+
+  it('splits on commas and newlines and trims whitespace', () => {
+    expect(parseTrimSections(' 0:30-1:00 , 2:00-2:30 \n 3:00-3:30 ')).toEqual([
+      '*0:30-1:00',
+      '*2:00-2:30',
+      '*3:00-3:30'
+    ])
+  })
+
+  it('keeps an existing leading * but does not double it', () => {
+    expect(parseTrimSections('*1:00-2:00')).toEqual(['*1:00-2:00'])
+  })
+
+  it('drops malformed tokens so garbage never reaches the argv', () => {
+    expect(parseTrimSections('not-a-range')).toEqual([])
+    expect(parseTrimSections('1:30')).toEqual([]) // no end
+    expect(parseTrimSections('')).toEqual([])
+    expect(parseTrimSections(undefined)).toEqual([])
+  })
+})
+
+describe('trim (--download-sections)', () => {
+  it('emits a --download-sections spec per range plus --force-keyframes-at-cuts', () => {
+    const argv = build(opts({ trim: '0:30-1:00, 2:00-2:30' }), dlo())
+    expect(hasSeq(argv, '--download-sections', '*0:30-1:00')).toBe(true)
+    expect(hasSeq(argv, '--download-sections', '*2:00-2:30')).toBe(true)
+    expect(argv).toContain('--force-keyframes-at-cuts')
+  })
+
+  it('emits nothing when there is no trim', () => {
+    const argv = build(opts(), dlo())
+    expect(argv).not.toContain('--download-sections')
+  })
+
+  it('does not double --force-keyframes-at-cuts when SponsorBlock-remove is also on', () => {
+    const argv = build(
+      opts({ trim: '0:30-1:00' }),
+      dlo({ sponsorBlock: true, sponsorBlockMode: 'remove', sponsorBlockCategories: ['sponsor'] })
+    )
+    expect(argv.filter((a) => a === '--force-keyframes-at-cuts')).toHaveLength(1)
+  })
+})
+
 // --- Collection folder paths (Phase G, media-manager) -----------------------
 
 describe('sanitizeDirSegment', () => {

test/queueStats.test.ts

@@ -0,0 +1,101 @@
+import { describe, it, expect } from 'vitest'
+import { summarizeQueue, sameVideo } from '../src/renderer/src/store/queueStats'
+import type { DownloadItem } from '../src/renderer/src/store/downloads'
+
+// Minimal item factory — only the fields summarizeQueue reads.
+function item(overrides: Partial<DownloadItem>): DownloadItem {
+  return {
+    id: Math.random().toString(36).slice(2),
+    url: 'https://youtube.com/watch?v=x',
+    title: 'x',
+    kind: 'video',
+    quality: '1080p',
+    status: 'queued',
+    progress: 0,
+    ...overrides
+  }
+}
+
+describe('summarizeQueue', () => {
+  it('counts statuses and flags active', () => {
+    const s = summarizeQueue([
+      item({ status: 'downloading', progress: 0.5 }),
+      item({ status: 'queued' }),
+      item({ status: 'error' }),
+      item({ status: 'completed', progress: 1 }),
+      item({ status: 'canceled' })
+    ])
+    expect(s.downloading).toBe(1)
+    expect(s.queued).toBe(1)
+    expect(s.failed).toBe(1)
+    expect(s.active).toBe(true)
+  })
+
+  it('is inactive and zeroed when nothing is downloading or queued', () => {
+    const s = summarizeQueue([item({ status: 'completed', progress: 1 })])
+    expect(s.active).toBe(false)
+    expect(s.progress).toBe(0)
+    expect(s.speedLabel).toBe('')
+    expect(s.etaLabel).toBe('')
+  })
+
+  it('averages progress over downloading + queued (queued counts as 0%)', () => {
+    // one at 80%, one queued at 0% → 40%
+    const s = summarizeQueue([
+      item({ status: 'downloading', progress: 0.8 }),
+      item({ status: 'queued' })
+    ])
+    expect(s.progress).toBeCloseTo(0.4, 5)
+  })
+
+  it('sums download speeds across MB/s and MiB/s strings', () => {
+    const s = summarizeQueue([
+      item({ status: 'downloading', progress: 0.1, speed: '4.0 MB/s' }),
+      item({ status: 'downloading', progress: 0.1, speed: '2000 KiB/s' })
+    ])
+    // 4.0 MB/s + ~2.0 MB/s ≈ 6.0 MB/s
+    expect(s.speedLabel).toBe('6.0 MB/s')
+  })
+
+  it('reports the longest active ETA as the time left', () => {
+    const s = summarizeQueue([
+      item({ status: 'downloading', progress: 0.5, eta: '0:30' }),
+      item({ status: 'downloading', progress: 0.2, eta: '2:10' })
+    ])
+    expect(s.etaLabel).toBe('2:10')
+  })
+})
+
+describe('sameVideo', () => {
+  it('matches identical URLs', () => {
+    expect(sameVideo('https://x.com/a', 'https://x.com/a')).toBe(true)
+  })
+
+  it('matches YouTube links by video id across watch/youtu.be/extra params', () => {
+    expect(
+      sameVideo(
+        'https://www.youtube.com/watch?v=dQw4w9WgXcQ',
+        'https://youtu.be/dQw4w9WgXcQ'
+      )
+    ).toBe(true)
+    expect(
+      sameVideo(
+        'https://youtube.com/watch?v=dQw4w9WgXcQ&list=PL123',
+        'https://www.youtube.com/watch?v=dQw4w9WgXcQ'
+      )
+    ).toBe(true)
+  })
+
+  it('does not match different videos', () => {
+    expect(
+      sameVideo(
+        'https://youtube.com/watch?v=aaaaaaaaaaa',
+        'https://youtube.com/watch?v=bbbbbbbbbbb'
+      )
+    ).toBe(false)
+  })
+
+  it('normalises www. and trailing slash for non-YouTube URLs', () => {
+    expect(sameVideo('https://www.vimeo.com/123/', 'https://vimeo.com/123')).toBe(true)
+  })
+})