docs(react-native-tracker): document react-native-web prerequisites and known limitations

[snowplow-claude-review]

Documents how to use the React Native tracker in a browser SPA via react-native-web, including setup prerequisites and known limitations.

What and why

The tracker's index.md already listed web as a supported target alongside iOS, Android, and Expo, but gave no guidance on what is required to make it work or what degrades. A customer running the tracker in a plain browser SPA found screen entity and screen_end absent — the most likely causes are a missing @react-native-async-storage/async-storage web adapter (causing a silent newTracker() Promise rejection) or calling trackScreenViewEvent before the async init resolves. This PR closes the documentation gap so users can self-serve.

Changes

docs/sources/react-native-tracker/index.md
New "Using with react-native-web" section:

• Prerequisites: @react-native-async-storage/async-storage web adapter must be configured (or useAsyncStorageForEventStore: false set); newTracker() must be awaited before the first tracking call.
• Known limitations: platformContext entity is entirely absent when Platform.OS === 'web' (all four required fields — osType, osVersion, deviceManufacturer, deviceModel — are undefined); lifecycleAutotracking uses tab visibility state changes rather than native app state on web.

docs/sources/react-native-tracker/tracking-events/screen-tracking/index.md
New "Using screen tracking in a browser SPA" section confirming that screen entity and screen_end work correctly without a navigation library integration, and calling out the await newTracker() prerequisite explicitly with a cross-reference to the prerequisites in index.md.

What to check

• Headings are sentence-case throughout, H2 counts are at or below 5 per file.
• Internal links end in /index.md, no https://docs.snowplow.io absolute links.
• The useAsyncStorageForEventStore: false option is documented as an alternative for users who cannot configure the web adapter.

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Draft PR opened for review — please verify and run CI before merging.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	documentation	98a5b53	Commit Preview URL Branch Preview URL	Jul 23 2026, 09:24 PM