feat: Predictive Prefetching based on User Flow Dashboard

[coder45oj]

Description

Build an advanced dashboard component for Predictive Prefetching based on User Flow leveraging Web Workers and off-main-thread processing. Fault-tolerant data pipelines and secure interactions with thorough error tracking and fallback systems.

Implementation

Core Engine Library (src/lib/predictive-prefetch/)

• types.ts - Shared types for flow events, transitions, predictions, metrics, config
• flow-tracker.ts - Tracks navigation events, builds transition matrix, persists to localStorage
• prediction-engine.ts - Markov chain-based prediction with confidence scoring, recency boost, global probability weighting
• prefetch-worker.ts - Web Worker entry for off-main-thread prediction computation
• prefetch-manager.ts - Orchestrator managing worker lifecycle, prefetch execution, metrics tracking, event subscriptions, and fallback to inline computation

React Hook (src/hooks/usePredictivePrefetch.ts)

• Auto-tracks route changes via usePathname
• Manages PrefetchManager lifecycle
• Returns predictions, prefetch items, metrics, session info, reset function

UI Components (src/components/predictive-prefetch/)

• PredictPrefetchDashboard.tsx - Main dashboard showing current route, session flow trail, prediction summary, predicted next routes with confidence bars, and prefetch metrics
• PredictionCard.tsx - Individual prediction with confidence bar, status badge, optional prefetch button
• PrefetchMetricsPanel.tsx - Aggregate metrics grid (predictions, success rate, accuracy, avg confidence, cache hits/misses, worker status)

Demo Page (app/predictive-prefetch/page.tsx) - Standalone usage example with router.prefetch integration

Architecture Highlights

• Web Worker for off-main-thread prediction computation with 5s timeout and automatic inline fallback
• Markov chain model with recency boost and global probability weighting for accurate predictions
• Configurable via PrefetchConfig (maxPredictions, minConfidence, minProbability, workerEnabled, prefetchOnNavigation)
• Event system for real-time UI updates (navigation, prediction, prefetch, visit, error, reset events)
• localStorage persistence for cross-session flow history
• Cache-aware prefetch execution (avoids re-prefetching already prefetched/visited routes)

Test Coverage

• 85 tests passing across 7 test suites
• flow-tracker.ts: 99.25% statements
• prediction-engine.ts: 100% statements
• predictive-prefetch components: 90.69% statements
• usePredictivePrefetch hook: 89.55% statements
• All modules above 70% global threshold

Closes #592

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[coder45oj]

@coder45oj Please review and merge

[ayomideadeniran]

pr under reveiw, i will get backe to you if i find any wrong implementations.