feat(vision): live keypoint preview during video-file tracking#35
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Batch video tracking previously showed only a progress bar and drew no keypoints, so operators couldn't watch tracking happen (and the saved annotated video had no pose dots). - video_tracking_runner: add a throttled frame_cb (~10 preview/sec) to run(); _annotate now draws pose keypoints, so both the live preview and the saved _annotated.mp4 show dots. - cv_processor: extract shared draw_keypoints_on() helper used by both the live overlay and the batch annotation (draw_overlays delegates to it). - video_tracking_worker: new preview signal forwarding the runner frame_cb. - camera_panel: connect preview -> _preview.update_frame so the Camera-tab preview animates through frames with overlays during a run. - tests: runner frame-callback + keypoint rendering, worker re-emit.
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Batch video tracking previously showed only a progress bar and drew no keypoints, so operators couldn't watch tracking happen (and the saved annotated video had no pose dots).