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Decompose monolithic wirePlaybackTracking() into single-responsibility modules: - PanelState: per-panel playback state (phase, segments, buffer, quality) - EventWiring: attaches hls.js + video element event listeners - BufferMonitor: periodic buffer health check with timer lifecycle - PanelRenderer: per-panel overlay rendering (phase, quality, segments) - AggregateRenderer: global status bar aggregating all panel states - PanelFactory: DOM panel creation + HLS/direct playback routing Each module handles one concern: state tracking, event registration, buffer monitoring, overlay rendering, aggregate rendering, or DOM creation. Also fix: walk() dead code bug in m3u8DeepProbeFn where the string check was unreachable behind the object-type guard.