Sam 40fa527633
FIX: cross talk when in ai helper (#1478)
Previous to this change we reused channels for proofreading progress and
ai helper progress

The new changeset ensures each POST to stream progress gets a dedicated
message bus channel

This fixes a class of issues where the wrong information could be displayed
to end users on subsequent proofreading or helper calls

* fix tests

* fix implementation (got to subscribe at 0)
2025-07-01 18:02:16 +10:00
..