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/l10n/app_en.arb

@@ -117,5 +117,60 @@
   "uploadStateConfirmed": "Confirmed",
   "uploadStateCancelled": "Cancelled",
   "uploadStateExpired": "Expired",
-  "thisDevice": "This device"
+  "thisDevice": "This device",
+  "queueAlbumFilterAll": "All albums",
+  "queueStateAll": "All",
+  "queueStatePreparing": "Preparing",
+  "queueStateQueued": "Queued",
+  "queueStateUploading": "Uploading",
+  "queueStateWaitingNetwork": "Waiting for network",
+  "queueStateFailed": "Failed",
+  "queueStateCompleted": "Done",
+  "queueTimeAll": "Any time",
+  "queueTimeToday": "Today",
+  "queueTimeLast7Days": "Last 7 days",
+  "queueTimeLast30Days": "Last 30 days",
+  "queueEmpty": "No upload tasks",
+  "queueRetryAllFailed": "Retry all failed",
+  "queueAttemptCount": "{count} attempt(s)",
+  "@queueAttemptCount": { "placeholders": { "count": { "type": "int" } } },
+  "taskStatePreparing": "Preparing",
+  "taskStatePreparationFailed": "Preparation failed",
+  "taskStateQueued": "Queued",
+  "taskStateUploading": "Uploading",
+  "taskStateUploadedConfirming": "Confirming",
+  "taskStateCompleted": "Completed",
+  "taskStateWaitingNetwork": "Waiting for network",
+  "taskStateRetryableFailed": "Upload failed",
+  "taskStateCancelled": "Cancelled",
+  "errorPrepSourceUnreadable": "Could not read the selected photo. Please reselect",
+  "errorPrepUnsupportedType": "Only JPG, PNG and HEIC images are supported",
+  "errorPrepTooLarge": "Photo exceeds the 50MB limit",
+  "errorPrepCopyFailed": "Failed to copy the photo. Please retry",
+  "errorUploadSourceMissing": "Source file is missing. Please reselect",
+  "errorAlbumUploadDisabled": "Album uploads are disabled",
+  "errorUploadSessionConflict": "Upload session conflict. Please retry",
+  "errorUploadVerifyFailed": "Upload verification failed. Will retry",
+  "captureTitle": "Continuous capture",
+  "captureCategoryDefault": "Default category",
+  "captureSwitchHint": "Switching only affects photos captured afterwards",
+  "capturePendingBadge": "Pending {count}",
+  "@capturePendingBadge": { "placeholders": { "count": { "type": "int" } } },
+  "captureFailedBadge": "Failed {count}",
+  "@captureFailedBadge": { "placeholders": { "count": { "type": "int" } } },
+  "capturePickFromGallery": "Pick from gallery",
+  "captureShutter": "Capture",
+  "captureExitTitle": "Leave shooting?",
+  "captureExitBody": "{count} photo(s) are still uploading. Tasks will continue in the background after you leave.",
+  "@captureExitBody": { "placeholders": { "count": { "type": "int" } } },
+  "captureKeepShooting": "Keep shooting",
+  "captureExitConfirm": "Leave",
+  "cameraPermissionDenied": "Camera unavailable. Allow camera access in system settings",
+  "cameraInitFailed": "Camera failed to initialize",
+  "uploadActionCapture": "Capture and upload",
+  "uploadActionPick": "Pick from gallery",
+  "uploadAction": "Upload",
+  "uploadEnqueuedCount": "Added {count} photo(s) to the upload queue",
+  "@uploadEnqueuedCount": { "placeholders": { "count": { "type": "int" } } },
+  "uploadPickNone": "No photos selected"
 }