Update react-native demos to use sync streams and bump dependencies

[bean1352]

Add sync streams and bump dependency versions in all react-native demos.

Demos:

• react-native-supabase-todolist - Bumped all dependencies to Expo SDK 54, added better styling to List and Todo widgets, fixed bug where attachment image doesn't render on android. Updated to use sync streams: lists and todos are auto-subscribed
• react-native-web-supabase-todolist - Bumped all dependencies to Expo SDK 54, migrated from react-native-elements to @rneui/themed, updated attachment API usage (attachmentFromSql, photoAttachmentQueue.deleteFile), fixed key warnings in List and Todo widgets with improved styling, and fixed attachment image URI handling for native. Updated to use sync streams: todos subscribe on-demand when opening a list and unsubscribe when navigating away, with per-list sync status displayed on the lists view.
• react-native-supabase-group-chat - Added local development setup with Docker Compose (Supabase CLI + PowerSync service), fixed expo-router Stack.Screen name prop errors, fixed message sync by feeding reactive query data directly to FlashList. Added sync streams. Important: Edition 3 config must be available in latest powersync-service release for this demo to work.
• react-native-supabase-background-sync - Upgraded Expo packages to Expo SDK 54. Does not require sync streams.
• react-native-barebones-opsqlite - Added loading state, random customer generation, and improved database setup. Adjusted Podfile and gradle-wrapper for compatibility with new versions. Does not require sync streams.

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Latest commit: 9da66ed

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[Chriztiaan]

Happy with the changes, I only manually tested RNST and RNWST on my side against a hosted Supabase.

[joshuabrink]

Tested all the demos. Couldn't find any issues running the apps and with usage flows.
Looks good.