Previously, preCheckMixedChannelRisk() skipped when selectedPlatforms
had more than one entry, and the catch block in submitBulkUpdate had no
409 handling — so multi-platform conflicts just showed a generic error.
- Rename canPreCheck(): only call pre-check API for single-platform
antigravity/anthropic selections (API requires a single platform param)
- Pass `built` into preCheckMixedChannelRisk() so pendingUpdatesForConfirm
is set before returning false
- submitBulkUpdate: add 409 mixed_channel_warning catch as fallback for
multi-platform case, saving baseUpdates for retry
- Remove needsMixedChannelCheck() gate on confirm_mixed_channel_risk flag;
use mixedChannelConfirmed alone so multi-platform retry also works
dde3b59e7b