Add cancellable model downloads

Ariver

2026-06-24 7999e66c9c78ada3666eb7cea7c22a352bb4cbf0

 privatevoice.src/frontend/src/lib/i18n/en.json

@@ -66,6 +66,8 @@
    "modelCurrent": "Current",
    "modelUse": "Use",
    "modelDownload": "Download",
    "modelCancel": "Cancel",
    "modelCancelling": "Cancelling",
    "modelWorking": "Working",
    "modelInstalled": "Installed",
    "modelNotInstalled": "Not installed",
@@ -276,7 +278,12 @@
    "optimizing": "Optimizing...",
    "extracting": "Extracting model files...",
    "complete": "Complete",
    "failed": "Setup failed"
    "failed": "Setup failed",
    "cancel": "Cancel",
    "cancelling": "Cancelling",
    "cancelled": "Cancelled",
    "cancelledDetail": "Model download was cancelled. You can download it again later.",
    "retry": "Download again"
  },
  "update": {
    "title": "Update Available",