docs: add TanStack DB + RxDB + Supabase article

[pubkey]

Summary

Adds a new article tanstack-db-supabase that explains how to combine TanStack DB, RxDB, and Supabase into one local-first stack.

The article covers:

• Using TanStack DB with RxDB as the persistence layer via the @tanstack/rxdb-db-collection package (rxdbCollectionOptions + createCollection), including live queries with useLiveQuery and optimistic mutations.
• Syncing Supabase with RxDB using the replicateSupabase plugin, with the required text primary key, _modified timestamp, and _deleted soft-delete column, plus Realtime publication setup.
• Benefits of the stack: sub-millisecond live queries via differential dataflow, durable offline-first storage, real-time Postgres sync, optimistic UI, cross-tab consistency, and no backend lock-in.
• Comparisons to the plain Supabase client, TanStack DB Query Collections, ElectricSQL/Zero, and RxDB alone.

Changes

• docs-src/docs/articles/tanstack-db-supabase.md - new article
• docs-src/sidebars.js - register the article under Articles
• orga/changelog/add-tanstack-db-supabase-article.md - changelog entry

Notes

The lint/test hooks fail in this environment due to missing dependencies (@eslint/compat, nconf) that are unrelated to this docs-only change.

https://claude.ai/code/session_014Ljhg9vBLJNGGmmQ7nJkwe

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