fix: track cards update during playback + periodic GPT re-analysis

feat(frontend): improve UI for detection and chat interaction

Fix track cards stuck at UNASSESSED due to frontend race condition

Redesign track cards with inline features, remove separate features panel, clean up overlays

Update overlays, tracker, GPT reasoning, and threat chat improvements

feat: Add mission-driven object relevance abstractions

feat: Implement depth-based distance estimation and frontend integration

feat: Real-time radar directionality via track sync

feat: Continuous object tracking, speed estimation, and overlay syncing

Refactor frontend into modular ES modules in frontend/ folder