fix(react): use SDK db API in query hook

[hardikdhingra150]

Summary

• fix useQuery to use the public SDK app API: app.db(collectionName)
• remove the call to unavailable collection.subscribe() and perform a guarded initial load instead
• refresh query state after insert and remove mutations
• delete by document _id through the collection filter API
• type the React context as ZerithDBApp and add a patch changeset for zerithdb-react

Bug Context

The active parent repository has Issues disabled, so I could not open an upstream issue first. I attempted to create one and GitHub returned HTTP 410. The bug is that useQuery treated useZerith() as a raw DbClient with collection(), while createApp() exposes collections through app.db(name). It also attempted to call collection.subscribe(), which is not present on the current CollectionClient implementation.

Validation

• pnpm exec prettier --check packages/react/src/index.tsx .changeset/fix-react-use-query-sdk-api.md
• pnpm --filter zerithdb-react build

Note: pnpm --filter zerithdb-react exec tsc --noEmit is currently blocked by existing monorepo path resolution issues in sdk/src imports for sibling package names.