docs: add "TanStack DB on IndexedDB with RxDB" article

[pubkey]

Summary

Adds a new article TanStack DB on IndexedDB with RxDB under docs-src/docs/articles/ that covers:

• How to use TanStack DB on top of RxDB with IndexedDB persistence: step-by-step setup using @tanstack/rxdb-db-collection (rxdbCollectionOptions + createCollection), live queries via useLiveQuery, and optimistic mutations, with a note on adding RxDB replication.
• Benefits of the stack: live queries with differential dataflow and optimistic mutations from TanStack DB, plus IndexedDB persistence, swappable storages, replication, schema/migration/encryption and cross-tab reactivity from RxDB.
• IndexedDB storage plugins for RxDB: Dexie.js storage, premium IndexedDB storage, LocalStorage storage, LocalStorage Meta Optimizer and OPFS, with when to use each.
• Performance of IndexedDB compared to other methods: ordering of in-memory, LocalStorage, IndexedDB and OPFS, including the embedded PerformanceChart for browser storages.

Changes

• New article: docs-src/docs/articles/tanstack-db-indexeddb.md
• Registered in docs-src/sidebars.js (Articles category, after react-indexeddb)
• Changelog entry under orga/changelog/

The article follows the existing documentation style (frontmatter, PerformanceChart component, Steps, HTML <details> FAQ, no em dashes) and links to related RxDB storage and replication docs.

https://claude.ai/code/session_01RUHqq2sZr31vmTA3jbFZbp

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