When timeline event is clicked in expert mode, emit jump_to_time command
with event timestamp. The time-travel player pauses live playback, seeks
CSI recording buffer to timestamp, and begins replay. Selected event
highlights in timeline and "Now replaying" chip appears in header.
Backend: POST /api/replay/jump-to-time creates replay session centered
on timestamp, replaces previous active session. Frontend: handleSeek()
in sidebar-timeline delegates to SpaxelReplay.jumpToTime() which calls
the API, shows replay control bar, and notifies Viz3D.
Tests: 7 Go test cases for jump-to-time endpoint, 8 JS test cases for
tap-to-jump interaction, event highlighting, and now-replaying chip.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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