feat(android): complete Android platform support and UI improvements
- Fix app.json schema errors (remove invalid Android properties)
- Install react-native-get-random-values for crypto polyfill support
- Add crypto polyfill import in polyfills.js
- Update Expo SDK packages to correct versions (expo@54.0.13, expo-font@~14.0.9, react-native-reanimated@~4.1.1)
- Add expo-system-ui for Android system UI color management
- Configure Android keyboard behavior (pan mode, dynamic padding)
- Add dynamic keyboard height tracking to keep input visible above keyboard
- Fix white navigation bar issue with proper background colors
- Update navigation labels from "Knowledge" to "Memory"
- Adjust input container bottom padding for better spacing
- Update app icon
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Co-Authored-By: Claude <noreply@anthropic.com>
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