fix: override preact to 10.28.2 to resolve JSON VNode Injection vulnerability (CVE-2026-22028)

[devin-ai-integration]

Description

Resolves Dependabot alert #402 — Preact JSON VNode Injection (CVE-2026-22028, GHSA-36hm-qxxp-pg3m, severity: high).

preact is a transitive dependency pulled in by @coinbase/wallet-sdk (via @dynamic-labs/ethereum, @privy-io/react-auth). The vulnerable range is >= 10.28.0, < 10.28.2. Since it's not a direct dependency, a pnpm override is used to pin all preact resolutions to 10.28.2.

⚠️ Reviewer note

The override also bumps [email protected] (used by @base-org/account via @reown/appkit-utils) to 10.28.2. This is a minor version bump for that consumer (10.24 → 10.28), not just a patch. The 10.24.2 version was outside the vulnerable range, but the blanket override consolidates both versions. Please verify CI passes cleanly — if there are runtime issues in the wallet quickstart app (which uses @reown/appkit), a scoped override like "@coinbase/wallet-sdk>preact": "10.28.2" may be preferable instead.

Test plan

• pnpm lint — passes
• pnpm test:vitest — all 11 test suites pass
• No manual app testing performed; relying on CI

Package updates

• preact: 10.24.2 / 10.28.0 → 10.28.2 (via pnpm override)
• No changesets needed — this is a root-level transitive dependency override, not a published package change.

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Link to Devin run: https://crossmint.devinenterprise.com/sessions/60ab00d1319f460d9a52407b624d7e48
Requested by: @soinclined

[devin-ai-integration]

Original prompt from Penelope

Please TAL at the following dependabot alert and create a PR that doesn't break anything and resolves this issue. https://github.com/Crossmint/crossmint-sdk/security/dependabot/402

[devin-ai-integration]

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