Route downloads into Documents\Video / Documents\Audio and simplify the home page

- Create Documents\Video and Documents\Audio on startup (ensureMediaDirs), and
  route each download into them by kind when no explicit output folder is set.
  An empty outputDir now means "sort by type"; a chosen folder still overrides
  for both kinds.
- Settings/Onboarding "Download folder" gains a placeholder + hint describing
  the blank = route-by-type behaviour.
- Trim the home download bar to the essentials: URL box, Search and Paste
  buttons, format/quality, and the Download button. Removed the private-mode
  toggle, per-download Options panel, custom-command panel, command preview, and
  the saving-to-folder line.
- Bump version to 0.3.0.

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

src/main/settings.ts

@@ -1,5 +1,6 @@
 import { app } from 'electron'
 import { join } from 'path'
+import { mkdirSync } from 'fs'
 import Store from 'electron-store'
 import { isSafeFilenameTemplate, isSafeOutputDir } from './validation'
 import {
@@ -16,7 +17,7 @@ import {
 } from '@shared/ipc'
 
 const DEFAULTS: Settings = {
-  outputDir: '', // resolved to the OS Downloads folder on first read
+  outputDir: '', // blank = route by kind into Documents\Video / Documents\Audio (see getDefaultMediaDir)
   defaultKind: 'video',
   defaultVideoQuality: 'Best available',
   defaultAudioQuality: 'Best (MP3)',
@@ -45,6 +46,31 @@ export function getDownloadArchivePath(): string {
   return join(app.getPath('userData'), 'download-archive.txt')
 }
 
+/**
+ * The default per-kind download destination: video → Documents\Video,
+ * audio → Documents\Audio. Used when the user hasn't set an explicit output
+ * folder (Settings → Download folder), so downloads are sorted by type.
+ */
+export function getDefaultMediaDir(kind: 'video' | 'audio'): string {
+  return join(app.getPath('documents'), kind === 'audio' ? 'Audio' : 'Video')
+}
+
+/**
+ * Create the Documents\Video and Documents\Audio folders up front (called once
+ * at startup) so they exist the moment the app opens, not just after the first
+ * download. Best-effort: yt-dlp also creates the output dir at download time, so
+ * a failure here (read-only Documents, redirected folder) is non-fatal.
+ */
+export function ensureMediaDirs(): void {
+  for (const kind of ['video', 'audio'] as const) {
+    try {
+      mkdirSync(getDefaultMediaDir(kind), { recursive: true })
+    } catch {
+      /* non-fatal — the download path will be created on demand instead */
+    }
+  }
+}
+
 // Coerce an untrusted partial into a valid DownloadOptions, falling back to the
 // defaults for any missing/invalid field. Used both to migrate older settings
 // files (which predate downloadOptions) and to validate renderer writes.
@@ -100,10 +126,9 @@ export function getSettings(): Settings {
   // `set`, so only write when something actually changed — otherwise this churns
   // the settings file on every read. (audit P1)
   const cur = s.store
-  if (!cur.outputDir) {
-    // Fill in the real Downloads path the first time, and persist it once.
-    s.set('outputDir', app.getPath('downloads'))
-  }
+  // outputDir is intentionally left blank by default — an empty value routes each
+  // download into Documents\Video / Documents\Audio by kind (see buildCommand).
+  // Only an explicit user choice (Settings → Download folder) overrides that.
   // Migrate settings files that predate downloadOptions (or hold a partial one),
   // but only persist when sanitizing actually altered the stored value.
   const sanitized = sanitizeOptions(cur.downloadOptions)