refactor(download): remove concurrent download option

The download API only permits one request at a time, so parallel
downloads are removed to avoid wasted/blocked API calls. Downloads
now always run sequentially (one track at a time).

- Drop concurrentDownloads from AppSettings + JSON serialization
- Remove setConcurrentDownloads and the settings UI (1-5 chips + warning)
- Strip optionsConcurrent* l10n keys from all ARBs and regenerate
- Rework queue worker into _processQueueSequential (single active download)
- Update marketing copy and adjust tests

lib/l10n/app_localizations.dart

@@ -494,30 +494,6 @@ abstract class AppLocalizations {
   /// **'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.'**
   String get optionsArtistTagModeSplitVorbisSubtitle;
 
-  /// Number of parallel downloads
-  ///
-  /// In en, this message translates to:
-  /// **'Concurrent Downloads'**
-  String get optionsConcurrentDownloads;
-
-  /// Download one at a time
-  ///
-  /// In en, this message translates to:
-  /// **'Sequential (1 at a time)'**
-  String get optionsConcurrentSequential;
-
-  /// Multiple parallel downloads
-  ///
-  /// In en, this message translates to:
-  /// **'{count} parallel downloads'**
-  String optionsConcurrentParallel(int count);
-
-  /// Warning about rate limits
-  ///
-  /// In en, this message translates to:
-  /// **'Parallel downloads may trigger rate limiting'**
-  String get optionsConcurrentWarning;
-
   /// Show/hide store tab
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_ar.dart

@@ -206,21 +206,6 @@ class AppLocalizationsAr extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_de.dart

@@ -211,21 +211,6 @@ class AppLocalizationsDe extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Schreibe einen Künstler Tag pro Künstler für FLAC und Opus; MP3 und M4A bleiben beigetreten.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Parallele Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequentiell (1 gleichzeitig)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallele Downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallele Downloads können Ratenlimitierung auslösen';
-
   @override
   String get optionsExtensionStore => 'Erweiterungs-Repo';
 

lib/l10n/app_localizations_en.dart

@@ -206,21 +206,6 @@ class AppLocalizationsEn extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_es.dart

@@ -206,21 +206,6 @@ class AppLocalizationsEs extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Store';
 
@@ -4448,21 +4433,6 @@ class AppLocalizationsEsEs extends AppLocalizationsEs {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Escribe una etiqueta de artista por artista para FLAC y OPUS; MP3 y M4A se mantienen agrupados.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Descargas simultáneas';
-
-  @override
-  String get optionsConcurrentSequential => 'Secuencial (1 a la vez)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count descargas en paralelo';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Las descargas paralelas pueden activar la limitación de velocidad';
-
   @override
   String get optionsExtensionStore => 'Extensión Repo';
 

lib/l10n/app_localizations_fr.dart

@@ -213,21 +213,6 @@ class AppLocalizationsFr extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Créez une balise « artiste » par artiste pour les fichiers FLAC et Opus ; les fichiers MP3 et M4A restent regroupés.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Téléchargements simultanés';
-
-  @override
-  String get optionsConcurrentSequential => 'Séquentiel (1 à la fois)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count téléchargements simultanés';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Les téléchargements simultanés peuvent déclencher une limitation du débit';
-
   @override
   String get optionsExtensionStore => 'Référentiel d\'extensions';
 

lib/l10n/app_localizations_hi.dart

@@ -206,21 +206,6 @@ class AppLocalizationsHi extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_id.dart

@@ -209,21 +209,6 @@ class AppLocalizationsId extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Tulis satu tag artis per artis untuk FLAC dan Opus; MP3 dan M4A tetap tergabung.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Unduhan Bersamaan';
-
-  @override
-  String get optionsConcurrentSequential => 'Berurutan (1 per waktu)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count unduhan paralel';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Unduhan paralel dapat memicu pembatasan rate';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_ja.dart

@@ -205,21 +205,6 @@ class AppLocalizationsJa extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => '同時ダウンロード';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count 件の分割ダウンロード';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_ko.dart

@@ -202,20 +202,6 @@ class AppLocalizationsKo extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => '동시 다운로드';
-
-  @override
-  String get optionsConcurrentSequential => '순차 다운로드 (한 번에 하나)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count개 동시 다운로드';
-  }
-
-  @override
-  String get optionsConcurrentWarning => '동시에 다수의 음반을 다운로드하면 속도 제한이 발생할 수 있습니다';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_nl.dart

@@ -206,21 +206,6 @@ class AppLocalizationsNl extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequentiële (1 per keer)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloaden kan leiden tot rate-limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_pt.dart

@@ -206,21 +206,6 @@ class AppLocalizationsPt extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Store';
 
@@ -4447,21 +4432,6 @@ class AppLocalizationsPtPt extends AppLocalizationsPt {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Downloads Simultâneos';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequencial (1 por vez)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count downloads paralelos';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Downloads simultâneos podem causar um limite da taxa (ratelimit)';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/app_localizations_ru.dart

@@ -211,21 +211,6 @@ class AppLocalizationsRu extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Одновременные загрузки';
-
-  @override
-  String get optionsConcurrentSequential => 'Последовательно (1 за раз)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count параллельных загрузок';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Параллельные загрузки могут вызвать ограничение скорости';
-
   @override
   String get optionsExtensionStore => 'Репозиторий расширения';
 

lib/l10n/app_localizations_tr.dart

@@ -211,21 +211,6 @@ class AppLocalizationsTr extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'FLAC ve Opus için her sanatçıya ayrı bir etiket yazın; MP3 ve M4A birleşik kalır.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Eş Zamanlı İndirmeler';
-
-  @override
-  String get optionsConcurrentSequential => 'Sıralı (Birer birer)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return 'Aynı anda $count indirme';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Aynı anda birden fazla indirme sınırlamaya takılabilir';
-
   @override
   String get optionsExtensionStore => 'Eklenti Deposu';
 

lib/l10n/app_localizations_uk.dart

@@ -212,21 +212,6 @@ class AppLocalizationsUk extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Для FLAC та Opus на кожного виконавця додати окремий тег виконавця; MP3 та M4A залишаються об’єднаними.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Кількість одночасних завантажень';
-
-  @override
-  String get optionsConcurrentSequential => 'Послідовно (по одному за раз)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count паралельних завантажень';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Паралельні завантаження можуть призвести до обмеження швидкості';
-
   @override
   String get optionsExtensionStore => 'Репозиторій розширень';
 

lib/l10n/app_localizations_zh.dart

@@ -206,21 +206,6 @@ class AppLocalizationsZh extends AppLocalizations {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Store';
 
@@ -4434,20 +4419,6 @@ class AppLocalizationsZhCn extends AppLocalizationsZh {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => '并行下载数';
-
-  @override
-  String get optionsConcurrentSequential => '按顺序下载（一次一首）';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '同时下载 $count 首';
-  }
-
-  @override
-  String get optionsConcurrentWarning => '并行下载可能会触发速率限制';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 
@@ -8670,21 +8641,6 @@ class AppLocalizationsZhTw extends AppLocalizationsZh {
   String get optionsArtistTagModeSplitVorbisSubtitle =>
       'Write one artist tag per artist for FLAC and Opus; MP3 and M4A stay joined.';
 
-  @override
-  String get optionsConcurrentDownloads => 'Concurrent Downloads';
-
-  @override
-  String get optionsConcurrentSequential => 'Sequential (1 at a time)';
-
-  @override
-  String optionsConcurrentParallel(int count) {
-    return '$count parallel downloads';
-  }
-
-  @override
-  String get optionsConcurrentWarning =>
-      'Parallel downloads may trigger rate limiting';
-
   @override
   String get optionsExtensionStore => 'Extension Repo';
 

lib/l10n/arb/app_ar.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_de.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Parallele Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequentiell (1 gleichzeitig)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallele Downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallele Downloads können Ratenlimitierung auslösen",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Erweiterungs-Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_en.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_es.arb

@@ -182,27 +182,6 @@
   "@optionsMaxQualityCoverSubtitle": {
     "description": "Subtitle for max quality cover"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Store",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_es_ES.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Descargas simultáneas",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Secuencial (1 a la vez)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} descargas en paralelo",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Las descargas paralelas pueden activar la limitación de velocidad",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extensión Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_fr.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Téléchargements simultanés",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Séquentiel (1 à la fois)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} téléchargements simultanés",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Les téléchargements simultanés peuvent déclencher une limitation du débit",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Référentiel d'extensions",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_hi.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_id.arb

@@ -206,27 +206,6 @@
   "@optionsMaxQualityCoverSubtitle": {
     "description": "Subtitle for max quality cover"
   },
-  "optionsConcurrentDownloads": "Unduhan Bersamaan",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Berurutan (1 per waktu)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} unduhan paralel",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Unduhan paralel dapat memicu pembatasan rate",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_ja.arb

@@ -190,27 +190,6 @@
   "@optionsMaxQualityCoverSubtitle": {
     "description": "Subtitle for max quality cover"
   },
-  "optionsConcurrentDownloads": "同時ダウンロード",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} 件の分割ダウンロード",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_ko.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "동시 다운로드",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "순차 다운로드 (한 번에 하나)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count}개 동시 다운로드",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "동시에 다수의 음반을 다운로드하면 속도 제한이 발생할 수 있습니다",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_nl.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequentiële (1 per keer)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloaden kan leiden tot rate-limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_pt.arb

@@ -182,27 +182,6 @@
   "@optionsMaxQualityCoverSubtitle": {
     "description": "Subtitle for max quality cover"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Store",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_pt_PT.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Downloads Simultâneos",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequencial (1 por vez)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} downloads paralelos",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Downloads simultâneos podem causar um limite da taxa (ratelimit)",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_ru.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Одновременные загрузки",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Последовательно (1 за раз)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} параллельных загрузок",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Параллельные загрузки могут вызвать ограничение скорости",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Репозиторий расширения",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_tr.arb

@@ -190,27 +190,6 @@
   "@optionsMaxQualityCoverSubtitle": {
     "description": "Subtitle for max quality cover"
   },
-  "optionsConcurrentDownloads": "Eş Zamanlı İndirmeler",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sıralı (Birer birer)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "Aynı anda {count} indirme",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Aynı anda birden fazla indirme sınırlamaya takılabilir",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Eklenti Deposu",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_uk.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Кількість одночасних завантажень",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Послідовно (по одному за раз)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} паралельних завантажень",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Паралельні завантаження можуть призвести до обмеження швидкості",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Репозиторій розширень",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_zh.arb

@@ -182,27 +182,6 @@
   "@optionsMaxQualityCoverSubtitle": {
     "description": "Subtitle for max quality cover"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Store",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_zh_CN.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "并行下载数",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "按顺序下载（一次一首）",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "同时下载 {count} 首",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "并行下载可能会触发速率限制",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/l10n/arb/app_zh_TW.arb

@@ -250,27 +250,6 @@
   "@optionsArtistTagModeSplitVorbisSubtitle": {
     "description": "Subtitle for split Vorbis artist tag mode"
   },
-  "optionsConcurrentDownloads": "Concurrent Downloads",
-  "@optionsConcurrentDownloads": {
-    "description": "Number of parallel downloads"
-  },
-  "optionsConcurrentSequential": "Sequential (1 at a time)",
-  "@optionsConcurrentSequential": {
-    "description": "Download one at a time"
-  },
-  "optionsConcurrentParallel": "{count} parallel downloads",
-  "@optionsConcurrentParallel": {
-    "description": "Multiple parallel downloads",
-    "placeholders": {
-      "count": {
-        "type": "int"
-      }
-    }
-  },
-  "optionsConcurrentWarning": "Parallel downloads may trigger rate limiting",
-  "@optionsConcurrentWarning": {
-    "description": "Warning about rate limits"
-  },
   "optionsExtensionStore": "Extension Repo",
   "@optionsExtensionStore": {
     "description": "Show/hide store tab"

lib/models/settings.dart

@@ -22,7 +22,6 @@ class AppSettings {
   final bool embedReplayGain; // Calculate and embed ReplayGain tags
   final bool maxQualityCover;
   final bool isFirstLaunch;
-  final int concurrentDownloads;
   final bool checkForUpdates;
   final String updateChannel;
   final bool hasSearchedBefore;
@@ -108,7 +107,6 @@ class AppSettings {
     this.embedReplayGain = false,
     this.maxQualityCover = true,
     this.isFirstLaunch = true,
-    this.concurrentDownloads = 1,
     this.checkForUpdates = true,
     this.updateChannel = 'stable',
     this.hasSearchedBefore = false,
@@ -171,7 +169,6 @@ class AppSettings {
     bool? embedReplayGain,
     bool? maxQualityCover,
     bool? isFirstLaunch,
-    int? concurrentDownloads,
     bool? checkForUpdates,
     String? updateChannel,
     bool? hasSearchedBefore,
@@ -237,7 +234,6 @@ class AppSettings {
       embedReplayGain: embedReplayGain ?? this.embedReplayGain,
       maxQualityCover: maxQualityCover ?? this.maxQualityCover,
       isFirstLaunch: isFirstLaunch ?? this.isFirstLaunch,
-      concurrentDownloads: concurrentDownloads ?? this.concurrentDownloads,
       checkForUpdates: checkForUpdates ?? this.checkForUpdates,
       updateChannel: updateChannel ?? this.updateChannel,
       hasSearchedBefore: hasSearchedBefore ?? this.hasSearchedBefore,

lib/models/settings.g.dart

@@ -21,7 +21,6 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   embedReplayGain: json['embedReplayGain'] as bool? ?? false,
   maxQualityCover: json['maxQualityCover'] as bool? ?? true,
   isFirstLaunch: json['isFirstLaunch'] as bool? ?? true,
-  concurrentDownloads: (json['concurrentDownloads'] as num?)?.toInt() ?? 1,
   checkForUpdates: json['checkForUpdates'] as bool? ?? true,
   updateChannel: json['updateChannel'] as String? ?? 'stable',
   hasSearchedBefore: json['hasSearchedBefore'] as bool? ?? false,
@@ -102,7 +101,6 @@ Map<String, dynamic> _$AppSettingsToJson(
   'embedReplayGain': instance.embedReplayGain,
   'maxQualityCover': instance.maxQualityCover,
   'isFirstLaunch': instance.isFirstLaunch,
-  'concurrentDownloads': instance.concurrentDownloads,
   'checkForUpdates': instance.checkForUpdates,
   'updateChannel': instance.updateChannel,
   'hasSearchedBefore': instance.hasSearchedBefore,

lib/providers/download_queue_provider.dart

@@ -1767,7 +1767,6 @@ class DownloadQueueState {
   final String singleFilenameFormat;
   final String audioQuality;
   final bool autoFallback;
-  final int concurrentDownloads;
 
   const DownloadQueueState({
     this.items = const [],
@@ -1780,7 +1779,6 @@ class DownloadQueueState {
     this.singleFilenameFormat = '{title} - {artist}',
     this.audioQuality = 'LOSSLESS',
     this.autoFallback = true,
-    this.concurrentDownloads = 1,
   });
 
   DownloadQueueState copyWith({
@@ -1794,7 +1792,6 @@ class DownloadQueueState {
     String? singleFilenameFormat,
     String? audioQuality,
     bool? autoFallback,
-    int? concurrentDownloads,
   }) {
     final resolvedItems = items ?? this.items;
     return DownloadQueueState(
@@ -1814,7 +1811,6 @@ class DownloadQueueState {
       singleFilenameFormat: singleFilenameFormat ?? this.singleFilenameFormat,
       audioQuality: audioQuality ?? this.audioQuality,
       autoFallback: autoFallback ?? this.autoFallback,
-      concurrentDownloads: concurrentDownloads ?? this.concurrentDownloads,
     );
   }
 
@@ -1962,14 +1958,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
   @override
   DownloadQueueState build() {
     ref.listen<AppSettings>(settingsProvider, (previous, next) {
-      final previousConcurrent =
-          previous?.concurrentDownloads ?? state.concurrentDownloads;
       updateSettings(next);
-      if (previousConcurrent != next.concurrentDownloads) {
-        _log.i(
-          'Concurrent downloads updated: $previousConcurrent -> ${next.concurrentDownloads}',
-        );
-      }
       if (previous?.downloadNetworkMode != next.downloadNetworkMode) {
         _handleDownloadNetworkModeChanged(next.downloadNetworkMode);
       }
@@ -3601,7 +3590,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
   }
 
   void updateSettings(AppSettings settings) {
-    final concurrentDownloads = settings.concurrentDownloads.clamp(1, 5);
     state = state.copyWith(
       outputDir: settings.downloadDirectory.isNotEmpty
           ? settings.downloadDirectory
@@ -3610,7 +3598,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       singleFilenameFormat: settings.singleFilenameFormat,
       audioQuality: settings.audioQuality,
       autoFallback: settings.autoFallback,
-      concurrentDownloads: concurrentDownloads,
     );
   }
 
@@ -6781,9 +6768,8 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       }
     }
 
-    _log.d('Concurrent downloads: ${state.concurrentDownloads}');
     try {
-      await _processQueueParallel();
+      await _processQueueSequential();
     } finally {
       if (iosDownloadBookmarkActive) {
         await PlatformBridge.stopAccessingIosBookmark();
@@ -6859,19 +6845,18 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     }
   }
 
-  Future<void> _processQueueParallel() async {
+  Future<void> _processQueueSequential() async {
     final activeDownloads = <String, Future<void>>{};
-    var lastLoggedMaxConcurrent = -1;
 
     _startMultiProgressPolling();
 
     while (true) {
       if (state.isPaused) {
         if (activeDownloads.isEmpty) {
-          _log.d('Queue is paused and no active downloads remain');
+          _log.d('Queue is paused and no active download remains');
           break;
         }
-        _log.d('Queue is paused, waiting for active downloads...');
+        _log.d('Queue is paused, waiting for active download...');
         await Future.any([
           Future.wait(activeDownloads.values),
           Future<void>.delayed(_queueSchedulingInterval),
@@ -6879,12 +6864,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
         continue;
       }
 
-      final maxConcurrent = max(1, state.concurrentDownloads);
-      if (lastLoggedMaxConcurrent != maxConcurrent) {
-        _log.d('Parallel worker max concurrency now: $maxConcurrent');
-        lastLoggedMaxConcurrent = maxConcurrent;
-      }
-
       final queuedItems = state.items
           .where(
             (item) =>
@@ -6898,7 +6877,9 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
         break;
       }
 
-      while (activeDownloads.length < maxConcurrent &&
+      // One download at a time: only start the next item once the current
+      // download has finished, to stay within the API's single-request limit.
+      if (activeDownloads.isEmpty &&
           queuedItems.isNotEmpty &&
           !state.isPaused) {
         final item = queuedItems.removeAt(0);
@@ -6911,9 +6892,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
         });
 
         activeDownloads[item.id] = future;
-        _log.d(
-          'Started parallel download: ${item.track.name} (${activeDownloads.length}/$maxConcurrent active)',
-        );
+        _log.d('Started download: ${item.track.name}');
       }
 
       if (activeDownloads.isNotEmpty) {

lib/providers/settings_provider.dart

@@ -392,12 +392,6 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
   }
 
-  void setConcurrentDownloads(int count) {
-    final clamped = count.clamp(1, 5);
-    state = state.copyWith(concurrentDownloads: clamped);
-    _saveSettings();
-  }
-
   void setCheckForUpdates(bool enabled) {
     state = state.copyWith(checkForUpdates: enabled);
     _saveSettings();

lib/screens/settings/download_settings_page.dart

@@ -178,12 +178,6 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
             SliverToBoxAdapter(
               child: SettingsGroup(
                 children: [
-                  _ConcurrentDownloadsItem(
-                    currentValue: settings.concurrentDownloads,
-                    onChanged: (v) => ref
-                        .read(settingsProvider.notifier)
-                        .setConcurrentDownloads(v),
-                  ),
                   SettingsItem(
                     icon: Icons.wifi,
                     title: context.l10n.settingsDownloadNetwork,
@@ -1015,139 +1009,6 @@ class _ServiceChip extends StatelessWidget {
   }
 }
 
-class _ConcurrentDownloadsItem extends StatelessWidget {
-  final int currentValue;
-  final ValueChanged<int> onChanged;
-  const _ConcurrentDownloadsItem({
-    required this.currentValue,
-    required this.onChanged,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Padding(
-      padding: const EdgeInsets.all(20),
-      child: Column(
-        crossAxisAlignment: CrossAxisAlignment.start,
-        children: [
-          Row(
-            children: [
-              Icon(
-                Icons.download_for_offline,
-                color: colorScheme.onSurfaceVariant,
-                size: 24,
-              ),
-              const SizedBox(width: 16),
-              Expanded(
-                child: Column(
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
-                    Text(
-                      context.l10n.optionsConcurrentDownloads,
-                      style: Theme.of(context).textTheme.bodyLarge,
-                    ),
-                    const SizedBox(height: 2),
-                    Text(
-                      currentValue == 1
-                          ? context.l10n.optionsConcurrentSequential
-                          : context.l10n.optionsConcurrentParallel(
-                              currentValue,
-                            ),
-                      style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                        color: colorScheme.onSurfaceVariant,
-                      ),
-                    ),
-                  ],
-                ),
-              ),
-            ],
-          ),
-          const SizedBox(height: 16),
-          Row(
-            children: [
-              for (final n in [1, 2, 3, 4, 5]) ...[
-                if (n > 1) const SizedBox(width: 8),
-                _ConcurrentChip(
-                  label: '$n',
-                  isSelected: currentValue == n,
-                  onTap: () => onChanged(n),
-                ),
-              ],
-            ],
-          ),
-          const SizedBox(height: 12),
-          Row(
-            children: [
-              Icon(
-                Icons.warning_amber_rounded,
-                size: 16,
-                color: colorScheme.error,
-              ),
-              const SizedBox(width: 8),
-              Expanded(
-                child: Text(
-                  context.l10n.optionsConcurrentWarning,
-                  style: Theme.of(
-                    context,
-                  ).textTheme.bodySmall?.copyWith(color: colorScheme.error),
-                ),
-              ),
-            ],
-          ),
-        ],
-      ),
-    );
-  }
-}
-
-class _ConcurrentChip extends StatelessWidget {
-  final String label;
-  final bool isSelected;
-  final VoidCallback onTap;
-  const _ConcurrentChip({
-    required this.label,
-    required this.isSelected,
-    required this.onTap,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    final isDark = Theme.of(context).brightness == Brightness.dark;
-    final unselectedColor = isDark
-        ? Color.alphaBlend(
-            Colors.white.withValues(alpha: 0.05),
-            colorScheme.surface,
-          )
-        : colorScheme.surfaceContainerHigh;
-    return Expanded(
-      child: Material(
-        color: isSelected ? colorScheme.primaryContainer : unselectedColor,
-        borderRadius: BorderRadius.circular(12),
-        child: InkWell(
-          onTap: onTap,
-          borderRadius: BorderRadius.circular(12),
-          child: Padding(
-            padding: const EdgeInsets.symmetric(vertical: 12),
-            child: Center(
-              child: Text(
-                label,
-                style: TextStyle(
-                  fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-                  color: isSelected
-                      ? colorScheme.onPrimaryContainer
-                      : colorScheme.onSurfaceVariant,
-                ),
-              ),
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
 class _MetadataSourceSelector extends ConsumerWidget {
   const _MetadataSourceSelector();
 

site/index.html

@@ -454,7 +454,7 @@
           <svg class="icon-svg" viewBox="0 0 24 24"><path fill="currentColor" d="M4 6H2v14c0 1.1.9 2 2 2h14v-2H4V6zm16-4H8c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 14H8V4h12v12zm-6-1l-4-4.8h3V5h2v4.2h3L14 14z"/></svg>
         </div>
         <h3>Batch & Playlist Download</h3>
-        <p>Download entire albums and playlists at once. Smart queue management with concurrent downloads.</p>
+        <p>Download entire albums and playlists at once. Smart queue management that downloads one track at a time.</p>
       </div>
       <div class="feature-card">
         <div class="feature-icon">

test/models_and_utils_test.dart

@@ -202,7 +202,6 @@ void main() {
 
       final updated = settings.copyWith(
         defaultService: 'tidal',
-        concurrentDownloads: 4,
         embedReplayGain: true,
         lyricsProviders: ['apple_music'],
         lyricsAppleElrcWordSync: true,
@@ -213,7 +212,6 @@ void main() {
       );
 
       expect(updated.defaultService, 'tidal');
-      expect(updated.concurrentDownloads, 4);
       expect(updated.embedReplayGain, isTrue);
       expect(updated.lyricsProviders, ['apple_music']);
       expect(updated.lyricsAppleElrcWordSync, isTrue);