Fix inference progress ending at 99% instead of 100%

Add final progress emit after the inference loop in _predict_generator_gui()
to ensure 100% is always shown. Previously, the throttled progress reporting
(~4Hz) could skip the final update if the last batch completed within 0.25s
of the previous report.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: talmo

sleap_nn/inference/predictors.py

@@ -567,6 +567,16 @@ def _predict_generator_gui(
                     print(json.dumps(progress_data), flush=True)
                     last_report = time()
 
+        # Final progress emit to ensure 100% is shown
+        elapsed = time() - start_time
+        progress_data = {
+            "n_processed": total_frames,
+            "n_total": total_frames,
+            "rate": round(frames_processed / elapsed, 1) if elapsed > 0 else 0,
+            "eta": 0,
+        }
+        print(json.dumps(progress_data), flush=True)
+
     def _predict_generator_rich(
         self, total_frames: int
     ) -> Iterator[Dict[str, np.ndarray]]: