Add cancellable model downloads

Ariver

2026-06-24 7999e66c9c78ada3666eb7cea7c22a352bb4cbf0

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offline restart QA started at 2026-06-02 22:37:42 +0800
log=/Users/ar/Projects/VoiceSnap-2.1.1-QA-build/02-P-NBL/round-1/logs/qa-runtime/offline-restart-test-20260602.223742.log
history_before=1657 | 开干吧，需要我配合什么？我在电脑旁边呢。
waiting 20 seconds for manual network-off