Remove stored auth test storage casts

[alfonso-noriega]

WHY are these changes introduced?

Fixes none.

The stored auth summary tests repeated storage as any casts, which obscured the intended test storage type and made malformed-storage setup harder to distinguish from normal typed calls.

WHAT is this pull request doing?

Adds typed test helpers for store-auth local storage and raw malformed bucket setup, then replaces the repeated as any casts in stored-auth.test.ts.

How to test your changes?

• pnpm --filter @shopify/store vitest run src/cli/services/store/auth/stored-auth.test.ts
• pnpm --filter @shopify/store lint

Note: pnpm --filter @shopify/store type-check was attempted locally but failed on existing @shopify/organizations module resolution errors unrelated to this test-only diff.

Post-release steps

None.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

[alfonso-noriega]

• Remove stored auth test storage casts #8106 👈 (View in Graphite)
• main

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