Merge feat/vocabulary-hint: names-and-terms decoder prompt (spec 001 workstream 2)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

# Conflicts:
#	docs/Architecture.md
#	docs/Decisions.md
#	docs/WorkBreakdown.md
#	server-py/sidecar.py
#	src/App.tsx
#	src/server/live.ts
#	src/server/transcribe.ts
#	tests/fixtures/fake_sidecar.py
#	tests/transcribe.test.ts

DESIGN.md

@@ -28,7 +28,7 @@ exists, not an aspiration. Update in the same commit as visual changes.
 ## Components
 
 One BEM-ish class block per React component in `src/components/` (`.model-picker`, `.dropzone`,
-`.live-controls`, `.engine-toggle`, `.auth-panel`, `.update-toast`, …), with modifier classes like
+`.live-controls`, `.engine-toggle`, `.auth-panel`, `.update-toast`, `.vocabulary-hint`, …), with modifier classes like
 `-selected`, `-active`, `-disabled`. Interactive states use `:hover:enabled` and `:focus-visible`.
 `.visually-hidden` exists for screen-reader-only text.
 Card headers (`.transcript-header`: title + export/Copy buttons) wrap, so on a phone the buttons