feat: add WhisperX diarization and speaker transcript UI

- add WhisperX diarization support to the Whisper VM server
- normalize speaker timestamp segments from Whisper responses
- document Hugging Face/pyannote VM setup and health checks
- show diarized speaker transcript blocks in record and transcript views
- group consecutive segments from the same speaker
- remove duplicate paragraph transcript display when diarized segments exist
- let diarized transcript content expand without an inner scrollbar

docs/WHISPER_VM.md

@@ -16,7 +16,8 @@ WHISPER_ALLOW_MOCK=false
 
 Expected endpoints:
 
-- `GET /health` returns any 2xx status when the VM is ready.
+- `GET /health` returns any 2xx status when the VM is ready. For WhisperX diarization, it should
+  also report `"whisperx": true` and `"diarization": true`.
 - `POST /transcribe` accepts multipart audio and returns one of:
 
 ```json
@@ -24,9 +25,49 @@ Expected endpoints:
   "transcript_text": "Meeting transcript...",
   "language": "en",
   "duration": 123.45,
-  "timestamps": [{ "start": 0, "end": 5, "text": "Hello" }]
+  "timestamps": [{ "speaker": "Speaker 1", "start": 0, "end": 5, "text": "Hello" }]
 }
 ```
 
 The API retries failed requests, applies `WHISPER_TIMEOUT_MS`, and marks jobs as failed when the VM
 is unavailable.
+
+## Enable WhisperX diarization on the VM
+
+The systemd unit runs `/home/cezen/whisper/server.py` inside the existing
+`/home/cezen/whisper/venv`. Deploy the updated script without creating a new venv:
+
+```bash
+scp scripts/whisper_http_server.py cezen@172.16.10.64:/home/cezen/whisper/server.py
+scp scripts/orphion-whisper.service cezen@172.16.10.64:/tmp/orphion-whisper.service
+ssh cezen@172.16.10.64 'sudo mv /tmp/orphion-whisper.service /etc/systemd/system/orphion-whisper.service'
+```
+
+Create `/home/cezen/whisper/.env` on the VM with the HuggingFace token accepted by pyannote:
+
+```env
+HUGGINGFACE_TOKEN=your_token_here
+WHISPERX_DIARIZATION=true
+WHISPERX_DEVICE=cuda
+WHISPERX_COMPUTE_TYPE=float16
+WHISPERX_BATCH_SIZE=8
+WHISPERX_DIARIZATION_MODEL=pyannote/speaker-diarization-community-1
+```
+
+The HuggingFace account behind the token must be approved for the configured pyannote diarization
+model. If transcription returns `"diarization": "fallback"` and the service log mentions a gated
+repo, visit `https://huggingface.co/pyannote/speaker-diarization-community-1` while signed in to
+that account and accept/request access.
+
+Restart and verify:
+
+```bash
+ssh cezen@172.16.10.64 'sudo systemctl daemon-reload && sudo systemctl restart orphion-whisper'
+curl -sS http://172.16.10.64:8000/health
+```
+
+Expected health shape:
+
+```json
+{ "status": "ok", "model": "large-v3", "device": "cuda", "whisperx": true, "diarization": true }
+```