feat(mobile): upload queue ui and continuous capture page

Task 9 (P3 plan): queue tab replaces the stub, continuous capture page
enqueues per shot, album detail gains an upload FAB, and the upload
engine lifecycle is now bound to the login session.

- Engine scope: session account drives UploadEngine start/stop; wired
  from app boot, login success, logout, and 401 eviction. Tasks stay in
  the store across logout (accountId hard isolation).
- Queue tab: album x state x time filter bar, task rows with thumbnail,
  state chip, localized error copy, attempt count, per-row progress via
  a broadcast progress hub, state-dependent actions (re-pick retry,
  retryNow, cancel, delete), batch retry bar, 200ms-debounced live
  refresh from drift table updates.
- Capture page: camera preview via injected CaptureSource, one enqueue
  per shutter press, persistent album/category/badges overlay with a
  switch-only-affects-new-shots hint, gallery multi-pick, exit confirm
  while uploads are pending, permission-denied and init-failure views.
- POST_NOTIFICATIONS runtime permission via a small MethodChannel
  (photolive/permissions) + PermissionPlugin.kt: single runtime
  permission need, avoids permission_handler dependency; requested once
  on first enqueue, silent degradation when denied or unavailable.
- Album detail FAB: capture-and-upload / pick-from-gallery sheet.
- l10n: ~50 new keys in zh/en arbs; tests: +45 (filter matrix, engine
  scope lifecycle, permission gate, queue tab, capture page, FAB entry);
  existing page tests updated to inject session/task-store fakes.

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

apps/mobile/lib/features/uploads/queue_l10n.dart

@@ -0,0 +1,75 @@
+/// 任务状态/上传域错误码 → 本地化文案（P3 计划 Task 9）。
+///
+/// 队列/连拍页专用扩展：契约错误码复用 core/error_l10n 的映射，此处
+/// 补齐上传域客户端伪码（准备阶段 [PrepErrorCodes]、引擎源缺失伪码）
+/// 与队列高频契约码（ALBUM_UPLOAD_DISABLED 等）。
+library;
+
+import '../../core/error_codes.dart';
+import '../../core/error_l10n.dart';
+import '../../l10n/app_localizations.dart';
+import '../albums/models.dart';
+import 'preparer.dart';
+import 'task_state.dart';
+import 'upload_engine.dart';
+
+extension AppLocalizationsUploadX on AppLocalizations {
+  /// 任务状态标签（chip/文案）。
+  String labelForTaskState(UploadTaskState state) => switch (state) {
+        UploadTaskState.preparing => taskStatePreparing,
+        UploadTaskState.preparationFailed => taskStatePreparationFailed,
+        UploadTaskState.queued => taskStateQueued,
+        UploadTaskState.uploading => taskStateUploading,
+        UploadTaskState.uploadedConfirming => taskStateUploadedConfirming,
+        UploadTaskState.completed => taskStateCompleted,
+        UploadTaskState.waitingNetwork => taskStateWaitingNetwork,
+        UploadTaskState.retryableFailed => taskStateRetryableFailed,
+        UploadTaskState.cancelled => taskStateCancelled,
+      };
+
+  /// 任务 lastError → 展示文案（上传域伪码 + 契约码；未映射回退
+  /// error_l10n 的通用解析）。
+  String messageForTaskError(String code) {
+    switch (code) {
+      case PrepErrorCodes.sourceUnreadable:
+        return errorPrepSourceUnreadable;
+      case PrepErrorCodes.unsupportedType:
+        return errorPrepUnsupportedType;
+      case PrepErrorCodes.tooLarge:
+        return errorPrepTooLarge;
+      case PrepErrorCodes.copyFailed:
+        return errorPrepCopyFailed;
+      case UploadEngine.sourceMissingCode:
+        return errorUploadSourceMissing;
+      case ErrorCodes.albumUploadDisabled:
+        return errorAlbumUploadDisabled;
+      case ErrorCodes.uploadSessionConflict:
+        return errorUploadSessionConflict;
+      case ErrorCodes.uploadVerifyFailed:
+        return errorUploadVerifyFailed;
+      default:
+        return messageForErrorCode(code);
+    }
+  }
+}
+
+/// 相册展示标题解析：当前 locale → 相册默认语言 → 首条 → 相册 ID。
+///
+/// locale 匹配按语言前缀（App locale `zh`/`en` vs 契约 `zh-CN`/`en`）。
+String albumDisplayTitle(AlbumSummary album, String localeName) {
+  final lang = localeName.split('-').first.toLowerCase();
+  AlbumTranslation? match;
+  for (final t in album.translations) {
+    if (t.locale.toLowerCase() == localeName.toLowerCase() ||
+        t.locale.toLowerCase().split('-').first == lang) {
+      match = t;
+      break;
+    }
+  }
+  if (match != null) return match.title;
+  for (final t in album.translations) {
+    if (t.locale == album.defaultLocale) return t.title;
+  }
+  if (album.translations.isNotEmpty) return album.translations.first.title;
+  return album.id;
+}