Refresh skips with bounded concurrency, not one at a time

The sweep awaited each episode's server query sequentially, and it runs on
every refresh including the library button. Several hundred downloaded
episodes meant a tap that used to take seconds took minutes, and under
WorkManager it risked being killed partway -- the same shape as the
ten-minute ceiling that stopped FingerprintWorker ever confirming.

Six at a time, through a semaphore inside the call's own coroutineScope so
nothing escapes to a background dispatcher. Per-episode failure isolation
is unchanged; CancellationException is rethrown rather than caught, the
bug already fixed once in skipFurniture().

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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