Add cancellable model downloads

Ariver

2026-06-24 7999e66c9c78ada3666eb7cea7c22a352bb4cbf0

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"CFBundleDisplayName" = "PrivateVoice Dictation";
"CFBundleName" = "PrivateVoice Dictation";
"NSMicrophoneUsageDescription" = "PrivateVoice Dictation needs microphone access for voice-to-text input.";