Usability and test infrastructure updates.

docs/WorkBreakdown.md

@@ -273,7 +273,19 @@ Notes (M5):
       (`estimatePeakLoadBytes`) is risky on a phone/tablet, covering the
       explicit Download button and the lazy auto-load on file-drop/live-start
       alike.
-- [ ] Basic a11y pass (keyboard, focus, aria on progress/live transcript)
+- [x] Basic a11y pass (keyboard, focus, aria on progress/live transcript) —
+      the model-download and transcription `<progress>` bars gained
+      `aria-label`s (previously announced as an unnamed percentage);
+      `TranscriptView`'s heading is now a programmatic focus target
+      (`tabIndex={-1}`) that receives focus the moment a final result lands,
+      so keyboard/screen-reader users land on new content instead of hunting
+      for it; the Copy button's "Copied!" state and `LiveControls`' status
+      transitions (requesting mic / listening / finishing) now also announce
+      via a visually-hidden `role="status"` region for users not focused on
+      the button. Keyboard operability was already in place everywhere in
+      scope (native buttons/inputs, `FileDropzone`'s `role="button"` +
+      `onKeyDown`) and needed no changes. `bun test` unaffected (233 pass, 1
+      pre-existing unrelated WER-gate failure, see Decisions.md).
 - [x] Production build + `bun start` deployment check; README for deployers —
       `bun run build` + `bun start` smoke-tested live (headers, hashed-asset
       immutability, `/api/*` routing, `AUTH_ENABLED=false`, server-engine
@@ -316,10 +328,16 @@ cached.
 - [~] Manual in-browser verification (mic permission, live text, offline run)
       — procedure in `tests/live.md`, pending a real browser (same dev-env
       caveat as M2/M3)
-- [ ] **Future want:** live transcription on the **server engine** — stream
-      mic audio over a WebSocket (D-011's escape hatch) to faster-whisper
-      (D-013) for logged-in users on weak devices. Needs its own decision
-      entry; blocked on M5 landing first.
+- [x] Live transcription on the **server engine** (D-019) — `GET
+      /api/transcribe/live` upgrades to a WebSocket (`src/server/live.ts`,
+      wired in `src/index.ts`); the client streams mic PCM and runs the
+      browser-engine UI unchanged otherwise (`App.tsx`'s `startLive`/`stopLive`
+      branch on `useServer`). Landed already but was undocumented here and
+      untested; brought up to the rest of the codebase's bar (D-032):
+      `createLiveWebSocket` now takes the sidecar as an injected dependency
+      like `createTranscribeHandlers`, the WS route validates
+      `language`/`task` the same way the HTTP route does, and
+      `tests/server-live.test.ts` covers the bridge against a fake sidecar.
 
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