[NT-2598] Add React Native extended view tracking

[Alex Freas (akfreas)]

Upgrades useViewportTracking from a single fire-and-forget event to the Web SDK's ElementViewObserver pattern: accumulated duration tracking, periodic updates, and final events per visibility cycle.

This aligns the RN SDK with the RFC's "Batched, Duration-based ComponentViews" recommendation.

• Rewrite useViewportTracking with a ViewCycleState machine that accumulates real visible time instead of sending the configured threshold as viewDurationMs
• Emit periodic update events at a configurable viewDurationUpdateIntervalMs (default 5s) after the initial dwell event
• Emit a final event when visibility ends (only if at least one event was already fired)
• Add AppState listener to pause/resume time accumulation on app background/foreground
• Thread new viewDurationUpdateIntervalMs prop through <Personalization> and <Analytics>
• Stable componentViewId per visibility cycle, fresh ID on each new cycle
• Update spec 023 with new acceptance scenarios, FRs, and success criteria
• Add unit tests for the hook and Detox e2e tests for periodic events, duration accumulation, and scroll-away/back cycles
• Enrich AnalyticsEventDisplay with per-component stats for e2e observability