- Create utils/timing/overlap_detection.py with SRTOverlapHandler class
- Centralize overlap detection and smart_natural fallback logic
- Update ChatterBox, F5-TTS, and Higgs Audio to use modular utility
- Remove duplicate _detect_overlaps methods from all engines
- Ensure consistent overlap handling behavior across engines
Now all engines use the same logic for detecting overlapping SRT segments
and automatically falling back from smart_natural to pad_with_silence mode.
