Hide input controls and display a spinner with "Waiting for
response..." while LLM extraction requests are in-flight. Controls
are restored on completion or failure. Applied consistently across
scan, roaster, and roast forms.
Add /scan page that lets authenticated users photograph or describe a
coffee bag, extracts both roaster and roast data via a single AI call,
and creates both entities on submit. Existing roasters are matched by
slug to avoid duplicates. Camera icon added to nav bar.