Sync engage-native docs with v1.18.4

[mintlify]

Summary

Syncs documentation for d-sports-engage-native after d-sports-ecosystem/d-sports-engage-native@9325f0e (v1.18.4 initial commit).

Trigger repo files changed

• All files in d-sports-engage-native (initial commit with full codebase at v1.18.4)

Docs pages updated

repositories/d-sports-engage-native.mdx

• Corrected tech stack versions: Expo 54 → 55, React Native 0.81 → 0.83, added React 19 minor
• Added Zustand 5, Sentry, OneSignal, and widgets to tech stack table
• Added typed routes note for Expo Router
• Added widgets and OTA updates to feature list
• Added environment variables table documenting all required EXPO_PUBLIC_* keys
• Added EAS build profiles table with all five profiles
• Noted GitHub Actions OTA workflow

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

• Added tab bar platform-split details (iOS NativeTabs vs Android/web PillTabBar)
• Added widgets section documenting iOS expo-widgets and Android react-native-android-widget