Group the four worker handles (analyze/transcribe x busy/tx) into a
new PipelineState struct with a FromRef<AppState> impl. Convert
heal_orphans_if_idle from a free function with 6 parameters into a
method on PipelineState. The two web handlers (handle_my_cases,
handle_case_detail) now take one State<PipelineState> instead of
four separate State extractors.
The original FromRef impls for AnalyzeBusy/Sender and TranscribeBusy/
Sender remain intact so handlers that need only one of them keep
their narrower signature.
Brummel
e995cdd7c4