Update demos to use sync streams

[bean1352]

Update web demos to use sync streams instead of legacy sync rules (bucket_definitions).

• react-supabase-todolist - migrated to sync streams with auto-subscribe
• react-supabase-todolist-optional-sync - migrated to sync streams with auto-subscribe
• react-neon-tanstack-query-notes - migrated to sync streams with auto-subscribe
• react-supabase-todolist-sync-streams - already uses sync streams
• angular-supabase-todolist - no sync rules in demo (uses external config)
• vue-supabase-todolist - no sync rules in demo (uses external config)
• nuxt-supabase-todolist - migrated to sync streams with auto-subscribe. Also updated login/sign up text which appeared inverted.
• react-multi-client - migrated to sync streams with auto-subscribe
• yjs-react-supabase-text-collab - migrated to sync streams with auto-subscribe
• example-vite - no sync rules (example only)
• example-webpack - no sync rules (example only)
• example-nextjs - no sync rules (example only)
• example-capacitor - no sync rules (example only)
• example-electron - no sync rules (example only)
• example-electron-node - no sync rules (example only)
• example-node - no sync rules (example only)
• example-vite-encryption - no sync rules (example only)
• react-supabase-todolist-tanstackdb - no sync rules (example only)

React native demos have already been upgraded to sync streams (along with Expo version bumps) in this PR.

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Latest commit: c366080

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[Chriztiaan]

I haven't tested this on my side, happy with the changes though.

[joshuabrink]

Changes look good. Tested all the updated demos - no issues this side.