Update engage-native docs for SDK 55 migration

[mintlify]

Summary

Syncs documentation with d-sports-ecosystem/d-sports-engage-native@21813a7 (PR #19: Expo SDK 55 migration and cross-platform widgets).

Trigger repo files changed

• 416 files added/changed in d-sports-engage-native (full SDK 55 migration: Expo 54→55, RN 0.81→0.83, React 19→19.2, new widget system, native tab bar, EAS CI workflow)

Docs pages updated

repositories/d-sports-engage-native.mdx

• Updated tech stack table: Expo 55, RN 0.83, React 19.2
• Added widgets, Sentry, and OneSignal to tech stack
• Added cross-platform widgets and Live Activities to features list
• Added locker room games and profile achievements to features
• Updated "what changed" section with SDK 55 migration, widgets, native tab bar, router features, and EAS CI details
• Added environment variables reference table
• Updated getting started with env setup and OTA update commands

repositories/d-sports-engage-native/architecture.mdx

• Expanded app architecture with modular screen pattern details and specific hook references
• Added Zustand + MMKV to state management section
• Expanded API client section with cache-first fetching and full module list
• Added new "tab bar — platform split" section (iOS NativeTabs vs Android/web PillTabBar)
• Added new "widgets and Live Activities" section covering iOS widget, Live Activity, and Android widget
• Added new "EAS builds and OTA updates" section