Check Parakeet chunks export to .srt and timestamped text, and record the headless Chrome run

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

docs/WorkBreakdown.md

@@ -349,6 +349,11 @@ cached.
 - [x] File and live mode; WASM int8 baseline; explicit WebGPU = fp16 encoder (opt-in only).
 - [x] Hidden on phones/tablets; English-only note instead of language/task controls.
 - [x] Real-model WER/wall-clock vs Large v3 Turbo (CPU), opt-in `PARAKEET_REAL=1` test.
+- [x] Headless Chrome (no GPU, fresh profile, prod build, COOP/COEP on): picking Parakeet and
+      dropping `en_aiproblem.m4a` downloaded the weights, cached them ("available offline"),
+      ran on WASM (12 threads) and showed the transcript, 2 timestamp segments and the
+      .txt/.srt/.txt+ts/Copy exports — 15 s end to end including the ~670 MB download. Picker
+      screenshots: desktop light/dark show the row + English-only note; a phone UA hides it.
 - [ ] Owner's browser check: real Chrome WASM load/transcribe (speed, memory), explicit
       WebGPU on a real GPU (works? faster than WASM? fallback restart), Firefox/Safari WASM.