chore(client): remove the unused @tanstack/react-query dependency

[gilgardosh]

Step 7 of 10 in the urql quick-wins sequence — tracking doc in #4437.

⚠️ Stacked on #4447 (step 6) → #4446 → #4444. Retarget as the stack merges.

What changed

@tanstack/react-query@5.102.8 was a declared dependency with a QueryClientProvider mounted at the root of the app — configured with refetchOnWindowFocus: false and retry: 1 — and nothing ever used it.

The only reference anywhere in the repo was the import in root-layout.tsx that created and mounted it. No file imports useQuery, useMutation or useSuspenseQuery from it; all GraphQL fetching goes through urql. Verified repo-wide, not just in packages/client.

Provider, QueryClient construction and the dependency are all removed. The surrounding UrqlProvider > UserProvider nesting is otherwise unchanged.

⚠️ @tanstack/react-table is untouched

Different package, and load-bearing — it backs every table in the app, and packages/client/CLAUDE.md documents a v9-specific API convention around it. Only react-query is removed here. Worth a second look during review, since the two names are one character apart.

Testing

Nothing to test — this removes code that was never reached. The value is in the verification that it wasn't reached, which is the grep above plus a green build.

yarn test:client   48 files, 373 passed, 0 skipped
yarn lint          0 errors
tsc --noEmit       clean
vite build         ✓ built in 4.79s

yarn.lock is updated by the removal.

🤖 Generated with Claude Code

https://claude.ai/code/session_01TbrGL3NndzRiEwJkwHxnbm

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Generated by Claude Code

[Copilot]

🟢 Approval recommended

The remaining documentation nit is minor and does not block approval.

Pull request overview

Removes the unused @tanstack/react-query dependency and root provider while preserving urql and React Table usage.

Changes:

• Removed QueryClient and QueryClientProvider.
• Removed dependency and lockfile entries.
• Added changeset documentation.

File summaries

File	Summary
yarn.lock	Removes React Query packages.
packages/client/src/router/layouts/root-layout.tsx	Removes the unused provider.
packages/client/package.json	Removes the dependency.
.changeset/urql-drop-dead-react-query.md	Documents the cleanup.
.changeset/@accounter_client-4448-dependencies.md	Records the dependency removal.

Review note: Narrow the changeset’s “only reference” claim to live application/source references; historical references remain (nit, 1 vote).

Review details

Suppressed comments (1)

.changeset/urql-drop-dead-react-query.md:11

• This says the only reference is the root-layout import, but the repository still contains historical references in packages/client/CHANGELOG.md and prior dependency changesets. Narrow this to live application/source references so the release note is factually accurate.

reference anywhere in the repo was the import in `router/layouts/root-layout.tsx` that created and
mounted it; no file imports `useQuery`, `useMutation` or `useSuspenseQuery` from it. All GraphQL data
fetching goes through urql.

• Files reviewed: 4/5 changed files
• Comments generated: 0
• Review effort level: Lite

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