Fix speaker diarization: WAV conversion, pyannote 4.0 compat, telemetry bug

- Convert non-WAV audio to 16kHz mono WAV before diarization (pyannote
  v4.0.4 AudioDecoder returns None duration for FLAC, causing crash)
- Handle pyannote 4.0 DiarizeOutput return type (unwrap .speaker_diarization)
- Disable pyannote telemetry (np.isfinite(None) bug with max_speakers)
- Use huggingface_hub.login() to persist token for all sub-downloads
- Pre-download sub-models (segmentation-3.0, speaker-diarization-community-1)
- Add third required model license link in settings UI
- Improve SpeakerManager hints based on settings state
- Add word-wrap to transcript text

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/components/TranscriptEditor.svelte

@@ -217,6 +217,8 @@
   .segment-text {
     line-height: 1.6;
     padding-left: 0.75rem;
+    word-wrap: break-word;
+    overflow-wrap: break-word;
   }
   .word {
     cursor: pointer;