test(frontend): pin allowed_accounts UI enforcement

[cristim]

Summary

Add allowed-accounts.test.ts covering the three frontend surfaces that rely on the backend's allowed_accounts filtering (issue #313):

• Account chip (3 tests): when listAccounts returns a filtered subset the chip option list contains exactly those accounts plus the All Accounts sentinel. Disallowed accounts never appear. Zero-account case yields only the sentinel.
• History list (2 tests): the UI renders exactly the rows returned by getHistory with no additional client-side account filtering. Empty response yields zero rendered rows.
• 403 on Cancel (1 test): when cancelPurchase rejects with a 403 (disallowed account accessed via deep link or stale tab) the handler surfaces a user-friendly error toast instead of an unhandled exception.

Closes #313

Test plan

• All 6 new tests pass (jest src/__tests__/allowed-accounts.test.ts)
• Pre-commit hooks pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 711270c2-9d13-4e28-ae39-207d9ee66490

📥 Commits

Reviewing files that changed from the base of the PR and between bc8831b and 418e850.

📒 Files selected for processing (1)

• frontend/src/__tests__/allowed-accounts.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/frontend-allowed-accounts-313

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