Better error messages + reduce segments to 40 for GPU time limit

- Show full traceback in error messages for debugging
- Reduce MAX_SLICES from 80 to 40 (80 segments may exceed 60s GPU limit)

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

app.py

@@ -124,8 +124,11 @@ def train_voice_model(audio_file, model_name, epochs, progress=gr.Progress()):
         return result_msg, pth_path
 
     except Exception as e:
-        logger.error(f"Erreur training: {e}", exc_info=True)
-        return f"Erreur lors de l'entraînement : {str(e)}", None
+        import traceback
+        tb = traceback.format_exc()
+        logger.error(f"Erreur training: {tb}")
+        # Show last 500 chars of traceback for debugging
+        return f"Erreur lors de l'entraînement : {type(e).__name__}: {str(e)}\n\nDétails:\n{tb[-500:]}", None
 
 
 # ── Conversion Tab ───────────────────────────────────────────────────────────

pipeline/training.py

@@ -95,7 +95,7 @@ def preprocess(model_name: str, audio_path: str, sample_rate: int = 40000):
     segment_len_16k = int(3.5 * 16000)
     hop_16k = int(3.0 * 16000)
 
-    MAX_SLICES = 80  # Use all available audio for better quality
+    MAX_SLICES = 40  # Balance quality vs GPU time (60s ZeroGPU limit)
 
     n_slices = 0
     idx = 0