fix(demo): add missing updateTimeDisplay calls on event marker and log clicks

feat(demo): polish with animations, ambient canvas effects, and micro-interactions (Batch 5)

feat(demo): implement 2x2 quad inspect view and metrics panel (Batch 4)

feat(demo): wire state machine, processing simulation, and cross-component interactions

feat(demo): implement batch 2 UI — top bar, video feed, drawer, timeline, command bar

feat(demo): add mock data layer with tracks, events, timeline, and AI responses

feat(demo): scaffold HTML skeleton with CSS design system and grid layout