fix(ENG-12550): stateful query client

[adefreitas]

Summary by cubic

Make the React Query QueryClient stable in StackOneHub by creating it once with useState, and clear its cache when the auth token changes. This keeps the cache across renders to avoid needless refetches and prevents stale data between sessions, addressing ENG-12550.

^{Written for commit 46dfa72. Summary will update on new commits.}

[claude]

Claude Code Review

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[cubic-dev-ai]

No issues found across 1 file

_{Auto-approved: Standard best-practice fix for React Query. Stabilizing the QueryClient with useState prevents the cache from being reset on every render, improving performance and stability.}

[Copilot]

Pull request overview

This PR updates StackOneHub to create a single, stable React Query QueryClient instance per component mount, avoiding cache resets caused by constructing a new client on every render.

Changes:

• Replace per-render new QueryClient(...) creation with a lazy, state-initialized QueryClient via useState.
• Update React imports to include useState.

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[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

_{Auto-approved: Fixes a bug where QueryClient was recreated on every render and adds necessary cache clearing when the auth token changes. This follows standard React Query best practices.}