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1. Sync Engine Rearchitecture
Redesigned to eliminate drift, stutter, and race conditions.
• Migration to videoFrameCallback for deterministic sync.
• Hybrid video-radar synchronization architecture.
• Centralized offset handling logic and persistence.
• Drift Cascade Lockdown: Prevents seek-loops on low-end hardware.
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2. File Loading & Caching
Complete modularization of the file processing pipeline.
• Extraction of file handling into dedicated fileLoader.js.
• Incremental JSON & video loading support.
• Promise-based IndexedDB initialization (Race condition fixes).
• Non-blocking "fire-and-forget" caching logic.
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3. Performance Optimization
Rendering refactored for memory stability and frame-rate consistency.
• Removed layout-thrashing innerHTML calls in draw loops.
• Canvas optimization to avoid heap allocations and GC pressure.
• 20% total performance gain via smart throttling and debouncing.
• FPS counter stabilization with warmup and smoothing logic.
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4. Advanced Visualization
Intelligent data interpretation and professional UI interactions.
• Smart Labeling: Greedy collision resolution for track markers.
• Spectral Density: 95th-percentile normalized speed graph coloring.
• Vehicle Dimensions: Real-world 2D bounding box visualization.
• Dynamic range slider (20m–200m) with auto-scaling ROI.
• Inertial Tracking: Exponential mouse smoothing (60Hz/144Hz agnostic).
• Inverse zoom logic and boundary-aware tooltip constraints.
• Shift-Key seeking: Integrated timeline scrubbing within radar canvas.
• Relative distance square optimization to eliminate hover jitter.
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6. Living Documentation
• Interactive Codebase Overview: Integrated 3D-styled navigation.
• Color-coded architecture explorer (Core, Sync, UI, P5).
• Local PrismJS integration for high-perf syntax highlighting.
• Mini-map docking navigation system for architectural modules.
• First-run detection with automated User Guide onboarding.
• Standalone Keyboard Shortcut reference modal.
• Refactored header navigation with theme-aware icons.
• Internet-free operation (Removed Google Fonts dependency).
• Draggable and resizable side-panel for granular inspection.
• Bi-directional timeline synchronization.
• Expanded metadata for tracked objects (Risk, State, Sign).
• Throttled data updates to maintain rendering performance.
9 & 10. Stability & Infrastructure
• Monotonic Time Guards: Prevents clock-jitter crashes in interpolation.
• Guards against division-by-zero in SNR mapping.
• Standardized p.deltaTime across all browser engines.
• Theme-aware contrast adjustment for raw point visibility.
• Decoupled UI logic from the main.js orchestrator.
• Isolated keyboard shortcuts for improved maintainability.
• Unit test suite expanded for utils and parsers.
• Comprehensive Context and README documentation updates.
Classification: Major Release – Architectural & Performance Upgrade
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